vmp2
/
vmemu
3
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

updated vmp2 file format structures and how i serialize them...

Browse Source
merge-requests/8/head
_xeroxz 3 years ago
parent b123113171
commit 07fd9cc999
2 changed files with 120 additions and 24 deletions
Show Stats Download Patch File Download Diff File

2
dependencies/vmprofiler vendored

@ -1 +1 @@
Subproject commit fb59f8f58f86a7abe461999315bfbd40bca9622c
Subproject commit b336e0145d3655ebd7b43abd7338016f36640ab0

142
src/main.cpp
Unescape View File

@ -13,6 +13,10 @@ int __cdecl main( int argc, const char *argv[] )
parser.add_argument().name( "--bin" ).description( "path to unpacked virtualized binary..." );
parser.add_argument().name( "--out" ).description( "output file name..." );
parser.add_argument().name( "--unpack" ).description( "unpack a vmp2 binary..." );
parser.add_argument()
.name( "--emuall" )
.description( "scan for all vm enters and trace all of them... this may take a few minutes..." );
parser.add_argument()
.name( "--locateconst" )
.description( "scan all vm enters for a specific constant value...\n" );
@ -137,7 +141,8 @@ int __cdecl main( int argc, const char *argv[] )
for ( const auto &code_block : code_blocks )
{
const auto _code_block_size = sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 );
const auto _code_block_size = sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 ) +
code_block.vinstrs.size() * sizeof vm::instrs::virt_instr_t;
vmp2::v4::code_block_t *_code_block =
reinterpret_cast< vmp2::v4::code_block_t * >( malloc( _code_block_size ) );
@ -145,25 +150,23 @@ int __cdecl main( int argc, const char *argv[] )
// serialize block meta data...
_code_block->vip_begin = code_block.vip_begin;
_code_block->next_block_offset = _code_block_size;
_code_block->jcc.num_block_addrs = code_block.jcc.block_addr.size();
_code_block->vinstr_count = code_block.vinstrs.size();
_code_block->has_jcc = code_block.jcc.has_jcc;
_code_block->jcc_type = code_block.jcc.type;
_code_block->num_block_addrs = code_block.jcc.block_addr.size();
// serialize jcc data...
// serialize jcc branches...
for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
_code_block->jcc.block_addr[ idx ] = code_block.jcc.block_addr[ idx ];
output.write( reinterpret_cast< const char * >( _code_block ),
sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 ) );
_code_block->branch_addr[ idx ] = code_block.jcc.block_addr[ idx ];
// serialize virtual instructions...
auto vinstr_count = ( std::uint32_t )code_block.vinstrs.size();
output.write( reinterpret_cast< const char * >( &vinstr_count ), sizeof vinstr_count );
auto block_vinstrs = reinterpret_cast< vm::instrs::virt_instr_t * >(
reinterpret_cast< std::uintptr_t >( _code_block ) + sizeof vmp2::v4::code_block_t +
( code_block.jcc.block_addr.size() * 8 ) );
for ( auto idx = 0u; idx < code_block.vinstrs.size(); ++idx )
{
const auto& vinstr = code_block.vinstrs[ idx ];
output.write( reinterpret_cast< const char * >( &vinstr ), sizeof vinstr );
}
block_vinstrs[ idx ] = code_block.vinstrs[ idx ];
output.write( reinterpret_cast< const char * >( _code_block ), _code_block_size );
free( _code_block );
}
output.close();
@ -196,28 +199,121 @@ int __cdecl main( int argc, const char *argv[] )
output.write( reinterpret_cast< char * >( unpacked_bin.data() ), unpacked_bin.size() );
output.close();
}
else if ( parser.exists( "bin" ) && parser.exists( "locateconst" ) )
else if ( parser.exists( "bin" ) && parser.exists( "emuall" ) && parser.exists( "out" ) )
{
const auto module_base = reinterpret_cast< std::uintptr_t >(
LoadLibraryExA( parser.get< std::string >( "bin" ).c_str(), NULL, DONT_RESOLVE_DLL_REFERENCES ) );
const auto const_val = std::strtoull( parser.get< std::string >( "locateconst" ).c_str(), nullptr, 16 );
const auto image_base = umtils->image_base( parser.get< std::string >( "bin" ).c_str() );
const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
auto vm_handler_tables = vm::locate::all_handler_tables( module_base );
auto vm_enters = vm::locate::all_vm_enters( module_base, vm_handler_tables );
std::printf( "> number of vm enters = %d\n", vm_enters.size() );
if ( std::find_if( vm_enters.begin() + 1, vm_enters.end(),
[ & ]( const std::pair< std::uint32_t, std::uint32_t > &vm_enter_data ) -> bool {
return vm_enter_data.second == vm_enters[ 0 ].second;
} ) != vm_enters.end() )
std::vector< std::vector< vm::instrs::code_block_t > > virt_rtns;
for ( const auto &[ vm_enter_offset, encrypted_rva ] : vm_enters )
{
std::printf( "> optimizations can be done.\n" );
std::getchar();
std::printf( "> emulating vm enter at rva = 0x%x\n", vm_enter_offset );
vm::ctx_t vm_ctx( module_base, image_base, image_size, vm_enter_offset );
if ( !vm_ctx.init() )
{
std::printf( "[!] failed to init vmctx... this can be for many reasons..."
" try validating your vm entry rva... make sure the binary is unpacked and is"
"protected with VMProtect 2...\n" );
return -1;
}
vm::emu_t emu( &vm_ctx );
if ( !emu.init() )
{
std::printf( "[!] failed to init emulator...\n" );
return -1;
}
std::vector< vm::instrs::code_block_t > code_blocks;
if ( !emu.get_trace( code_blocks ) )
{
std::printf( "[!] something failed during tracing, review the console for more information...\n" );
continue;
}
std::printf( "> number of blocks = %d\n", code_blocks.size() );
virt_rtns.push_back( code_blocks );
}
std::printf( "> traced %d virtual routines...\n", virt_rtns.size() );
std::printf( "> serializing results....\n" );
vmp2::v4::file_header file_header;
file_header.magic = VMP_MAGIC;
file_header.epoch_time = std::time( nullptr );
file_header.version = vmp2::version_t::v4;
file_header.module_base = module_base;
file_header.image_base = image_base;
file_header.vm_entry_rva = 0ull;
file_header.module_offset = sizeof file_header;
file_header.module_size = image_size;
file_header.rtn_count = virt_rtns.size();
file_header.rtn_offset = image_size + sizeof file_header;
std::ofstream output( parser.get< std::string >( "out" ), std::ios::binary );
output.write( reinterpret_cast< const char * >( &file_header ), sizeof file_header );
output.write( reinterpret_cast< const char * >( module_base ), image_size );
for ( auto virt_rtn : virt_rtns )
{
vmp2::v4::rtn_t rtn{ virt_rtn.size() };
output.write( reinterpret_cast< const char * >( &rtn ), sizeof vmp2::v4::rtn_t::code_block_count );
for ( const auto &code_block : virt_rtn )
{
const auto _code_block_size = sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 ) +
code_block.vinstrs.size() * sizeof vm::instrs::virt_instr_t;
vmp2::v4::code_block_t *_code_block =
reinterpret_cast< vmp2::v4::code_block_t * >( malloc( _code_block_size ) );
// serialize block meta data...
_code_block->vip_begin = code_block.vip_begin;
_code_block->next_block_offset = _code_block_size;
_code_block->vinstr_count = code_block.vinstrs.size();
_code_block->has_jcc = code_block.jcc.has_jcc;
_code_block->jcc_type = code_block.jcc.type;
_code_block->num_block_addrs = code_block.jcc.block_addr.size();
// serialize jcc branches...
for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
_code_block->branch_addr[ idx ] = code_block.jcc.block_addr[ idx ];
auto block_vinstrs = reinterpret_cast< vm::instrs::virt_instr_t * >(
reinterpret_cast< std::uintptr_t >( _code_block ) + sizeof vmp2::v4::code_block_t +
( code_block.jcc.block_addr.size() * 8 ) );
for ( auto idx = 0u; idx < code_block.vinstrs.size(); ++idx )
block_vinstrs[ idx ] = code_block.vinstrs[ idx ];
output.write( reinterpret_cast< const char * >( _code_block ), _code_block_size );
free( _code_block );
}
}
output.close();
}
else if ( parser.exists( "bin" ) && parser.exists( "locateconst" ) )
{
const auto module_base = reinterpret_cast< std::uintptr_t >(
LoadLibraryExA( parser.get< std::string >( "bin" ).c_str(), NULL, DONT_RESOLVE_DLL_REFERENCES ) );
const auto const_val = std::strtoull( parser.get< std::string >( "locateconst" ).c_str(), nullptr, 16 );
const auto image_base = umtils->image_base( parser.get< std::string >( "bin" ).c_str() );
const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
auto vm_handler_tables = vm::locate::all_handler_tables( module_base );
auto vm_enters = vm::locate::all_vm_enters( module_base, vm_handler_tables );
std::printf( "> number of vm enters = %d\n", vm_enters.size() );
for ( const auto &[ vm_enter_offset, encrypted_rva ] : vm_enters )
{
std::printf( "> emulating vm enter at rva = 0x%x\n", vm_enter_offset );

Write Preview
Loading…
Cancel
Save