vmp2
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vmemu
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applied clang-format

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merge-requests/2/head
_xeroxz 4 years ago
parent 2c2ad89e8a
commit 4b9e0360e3
2 changed files with 283 additions and 305 deletions
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111
src/vmemu_t.cpp
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@ -2,16 +2,11 @@
namespace vm
{
emu_t::emu_t(std::uint32_t vm_entry_rva,
std::uintptr_t image_base, std::uintptr_t module_base)
:
module_base(module_base),
image_base(image_base),
vm_entry_rva(vm_entry_rva),
vm_handler_table(nullptr),
uc(nullptr),
trace_entries(nullptr)
{}
emu_t::emu_t( std::uint32_t vm_entry_rva, std::uintptr_t image_base, std::uintptr_t module_base )
: module_base( module_base ), image_base( image_base ), vm_entry_rva( vm_entry_rva ),
vm_handler_table( nullptr ), uc( nullptr ), trace_entries( nullptr )
{
}
bool emu_t::init()
{
@ -43,8 +38,7 @@ namespace vm
std::printf( ">>> handler addr = 0x%p\n", vm_handler.address );
// unicorn init stuff...
const auto image_size =
NT_HEADER(module_base)->OptionalHeader.SizeOfImage;
const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
std::uintptr_t stack_base = 0x1000000;
std::uintptr_t stack_addr = ( stack_base + ( 0x1000 * 20 ) ) - 0x6000;
@ -52,57 +46,50 @@ namespace vm
uc_err err;
if ( ( err = uc_open( UC_ARCH_X86, UC_MODE_64, &uc ) ) )
{
std::printf("failed on uc_mem_map() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_mem_map() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ( ( err = uc_mem_map( uc, module_base, image_size, UC_PROT_ALL ) ) )
{
std::printf("failed on uc_mem_map() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_mem_map() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ( ( err = uc_mem_map( uc, 0x1000000, 0x1000 * 20, UC_PROT_ALL ) ) )
{
std::printf("failed on uc_mem_map() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_mem_map() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ( ( err = uc_mem_write( uc, module_base, reinterpret_cast< void * >( module_base ), image_size ) ) )
{
std::printf("failed on uc_mem_write() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_mem_write() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ( ( err = uc_reg_write( uc, UC_X86_REG_RIP, &vm_entry ) ) )
{
std::printf("failed on uc_reg_write() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_reg_write() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ( ( err = uc_reg_write( uc, UC_X86_REG_RSP, &stack_addr ) ) )
{
std::printf("failed on uc_reg_write() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_reg_write() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
if ((err = uc_hook_add(uc, &trace, UC_HOOK_CODE, &vm::emu_t::hook_code,
this, module_base, module_base + image_size)))
if ( ( err = uc_hook_add( uc, &trace, UC_HOOK_CODE, &vm::emu_t::hook_code, this, module_base,
module_base + image_size ) ) )
{
std::printf("failed on uc_hook_add() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_hook_add() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
@ -110,8 +97,7 @@ namespace vm
if ( ( err = uc_hook_add( uc, &trace1, UC_HOOK_MEM_READ_UNMAPPED | UC_HOOK_MEM_WRITE_UNMAPPED,
vm::emu_t::hook_mem_invalid, this, 1, 0 ) ) )
{
std::printf("failed on uc_hook_add() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_hook_add() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
@ -120,7 +106,8 @@ namespace vm
emu_t::~emu_t()
{
if (uc) uc_close(uc);
if ( uc )
uc_close( uc );
}
bool emu_t::get_trace( std::vector< vmp2::v2::entry_t > &entries )
@ -131,8 +118,7 @@ namespace vm
if ( ( err = uc_emu_start( uc, vm_entry_rva + module_base, NULL, NULL, NULL ) ) )
{
std::printf("failed on uc_emu_start() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_emu_start() with error returned %u: %s\n", err, uc_strerror( err ) );
return false;
}
@ -163,14 +149,13 @@ namespace vm
entry->decrypt_key = entry->regs.rbx;
uc_err err;
if ((err = uc_mem_read(uc, entry->regs.rdi,
entry->vregs.raw, sizeof entry->vregs.raw)))
if ( ( err = uc_mem_read( uc, entry->regs.rdi, entry->vregs.raw, sizeof entry->vregs.raw ) ) )
return err;
// copy virtual stack values...
for ( auto idx = 0u; idx < sizeof( entry->vsp ) / 8; ++idx )
if ((err = uc_mem_read(uc, entry->regs.rbp + (idx * 8),
&entry->vsp.qword[idx], sizeof entry->vsp.qword[idx])))
if ( ( err = uc_mem_read( uc, entry->regs.rbp + ( idx * 8 ), &entry->vsp.qword[ idx ],
sizeof entry->vsp.qword[ idx ] ) ) )
return err;
return UC_ERR_OK;
@ -181,10 +166,7 @@ namespace vm
std::printf( ">>> Tracing instruction at 0x%p, instruction size = 0x%x\n", address, size );
// grab JMP RDX/RCX <-- this register...
static const auto jmp_reg = obj->vm_entry[obj->vm_entry.size()]
.instr.operands[0]
.reg
.value;
static const auto jmp_reg = obj->vm_entry[ obj->vm_entry.size() ].instr.operands[ 0 ].reg.value;
static ZydisDecoder decoder;
static std::once_flag once;
@ -193,8 +175,8 @@ namespace vm
// init zydis decoder just a single time...
std::call_once( once, [ & ]() -> void {
ZydisDecoderInit(&decoder,
ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64); });
ZydisDecoderInit( &decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64 );
} );
// last instruction in vm_entry is jmp rcx/rdx...
if ( address == obj->vm_entry[ obj->vm_entry.size() - 1 ].addr )
@ -203,18 +185,16 @@ namespace vm
vmp2::v2::entry_t new_entry;
if ( ( err = obj->create_entry( &new_entry ) ) )
{
std::printf("[!] failed to create new entry... reason = %u, %s\n",
err, uc_strerror(err));
std::printf( "[!] failed to create new entry... reason = %u, %s\n", err, uc_strerror( err ) );
exit( 0 );
}
obj->trace_entries->push_back( new_entry );
}
// if we are getting a callback for a JMP RCX/RDX instruction...
else if (ZYAN_SUCCESS(ZydisDecoderDecodeBuffer(
&decoder, reinterpret_cast<void*>(address), size, &instr)) &&
instr.mnemonic == ZYDIS_MNEMONIC_JMP &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
else if ( ZYAN_SUCCESS(
ZydisDecoderDecodeBuffer( &decoder, reinterpret_cast< void * >( address ), size, &instr ) ) &&
instr.mnemonic == ZYDIS_MNEMONIC_JMP && instr.operands[ 0 ].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[ 0 ].reg.value == jmp_reg )
{
switch ( jmp_reg )
@ -232,20 +212,19 @@ namespace vm
// checks to see if the address
// in JMP RDX/RCX is a vm handler address...
static const auto vm_handler_check =
[&](const vm::handler::handler_t& vm_handler) -> bool
{ return vm_handler.address == reg_val; };
static const auto vm_handler_check = [ & ]( const vm::handler::handler_t &vm_handler ) -> bool {
return vm_handler.address == reg_val;
};
if (std::find_if(obj->vm_handlers.begin(), obj->vm_handlers.end(),
vm_handler_check) == obj->vm_handlers.end())
if ( std::find_if( obj->vm_handlers.begin(), obj->vm_handlers.end(), vm_handler_check ) ==
obj->vm_handlers.end() )
return;
uc_err err;
vmp2::v2::entry_t new_entry;
if ( ( err = obj->create_entry( &new_entry ) ) )
{
std::printf("[!] failed to create new entry... reason = %u, %s\n",
err, uc_strerror(err));
std::printf( "[!] failed to create new entry... reason = %u, %s\n", err, uc_strerror( err ) );
exit( 0 );
}
@ -255,28 +234,26 @@ namespace vm
uc_emu_stop( uc );
}
bool emu_t::hook_mem_invalid(uc_engine* uc, uc_mem_type type,
uint64_t address, int size, int64_t value, vm::emu_t* obj)
bool emu_t::hook_mem_invalid( uc_engine *uc, uc_mem_type type, uint64_t address, int size, int64_t value,
vm::emu_t *obj )
{
uc_err err;
if ( ( err = uc_mem_map( obj->uc, address & ~0xFFFull, 0x1000, UC_PROT_ALL ) ) )
std::printf("failed on uc_mem_map() with error returned %u: %s\n",
err, uc_strerror(err));
std::printf( "failed on uc_mem_map() with error returned %u: %s\n", err, uc_strerror( err ) );
switch ( type )
{
case UC_MEM_WRITE_UNMAPPED:
printf(">>> Missing memory is being WRITE at 0x%p, data size = %u, data value = 0x%p\n",
address, size, value);
printf( ">>> Missing memory is being WRITE at 0x%p, data size = %u, data value = 0x%p\n", address, size,
value );
return true;
case UC_MEM_READ_UNMAPPED:
printf(">>> Missing memory is being READ at 0x%p, data size = %u, data value = 0x%p\n",
address, size, value);
printf( ">>> Missing memory is being READ at 0x%p, data size = %u, data value = 0x%p\n", address, size,
value );
return true;
default:
printf(">>> Missing memory at 0x%p, data size = %u, data value = 0x%p\n",
address, size, value);
printf( ">>> Missing memory at 0x%p, data size = %u, data value = 0x%p\n", address, size, value );
return true;
}
}
}
} // namespace vm

21
src/vmemu_t.hpp
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@ -1,31 +1,32 @@
#pragma once
#include <exception>
#include <Zydis/Zydis.h>
#include <cstdint>
#include <unicorn/unicorn.h>
#include <xtils.hpp>
#include <vmprofiler.hpp>
#include <exception>
#include <functional>
#include <mutex>
#include <unicorn/unicorn.h>
#include <vmp2.hpp>
#include <Zydis/Zydis.h>
#include <vmprofiler.hpp>
#include <xtils.hpp>
namespace vm
{
class emu_t
{
using callback_t = std::function< void( uc_engine *, uint64_t, uint32_t, void * ) >;
public:
explicit emu_t(std::uint32_t vm_entry_rva,
std::uintptr_t image_base, std::uintptr_t module_base);
explicit emu_t( std::uint32_t vm_entry_rva, std::uintptr_t image_base, std::uintptr_t module_base );
~emu_t();
bool init();
bool get_trace( std::vector< vmp2::v2::entry_t > &entries );
private:
uc_err create_entry( vmp2::v2::entry_t *entry );
static void hook_code( uc_engine *uc, uint64_t address, uint32_t size, vm::emu_t *obj );
static bool hook_mem_invalid(uc_engine* uc, uc_mem_type type,
uint64_t address, int size, int64_t value, vm::emu_t* obj);
static bool hook_mem_invalid( uc_engine *uc, uc_mem_type type, uint64_t address, int size, int64_t value,
vm::emu_t *obj );
uc_engine *uc;
uc_hook trace, trace1;
@ -38,4 +39,4 @@ namespace vm
std::vector< vm::handler::handler_t > vm_handlers;
std::vector< vmp2::v2::entry_t > *trace_entries;
};
}
} // namespace vm
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