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vmemu
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added support for virtual jmp tables... TODO: make sure im serializing

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.vmp2 file format v4 correctly...
merge-requests/8/head
_xeroxz 3 years ago
parent 3f9cb65b2f
commit b123113171
3 changed files with 111 additions and 17 deletions
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2
dependencies/vmprofiler vendored

@ -1 +1 @@
Subproject commit f06bf5f6b72b1d52a6156d6828675c77ceaee7e2
Subproject commit fb59f8f58f86a7abe461999315bfbd40bca9622c

60
src/main.cpp
Unescape View File

@ -92,50 +92,80 @@ int __cdecl main( int argc, const char *argv[] )
if ( code_block.jcc.has_jcc )
{
if ( code_block.jcc.type == vm::instrs::jcc_type::branching )
switch ( code_block.jcc.type )
{
case vm::instrs::jcc_type::branching:
{
std::printf( "> branch 1 = %p, branch 2 = %p\n", code_block.jcc.block_addr[ 0 ],
code_block.jcc.block_addr[ 1 ] );
else
break;
}
case vm::instrs::jcc_type::absolute:
{
std::printf( "> branch 1 = %p\n", code_block.jcc.block_addr[ 0 ] );
break;
}
case vm::instrs::jcc_type::switch_case:
{
std::printf( "> switch case blocks:\n" );
for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
std::printf( " case block at = 0x%p\n", code_block.jcc.block_addr[ idx ] );
break;
}
}
}
}
std::printf( "> serializing results....\n" );
vmp2::v3::file_header file_header;
vmp2::v4::file_header file_header;
file_header.magic = VMP_MAGIC;
file_header.epoch_time = std::time( nullptr );
file_header.version = vmp2::version_t::v3;
file_header.version = vmp2::version_t::v4;
file_header.module_base = module_base;
file_header.image_base = image_base;
file_header.vm_entry_rva = vm_entry_rva;
file_header.module_offset = sizeof file_header;
file_header.module_size = image_size;
file_header.code_block_offset = image_size + sizeof file_header;
file_header.code_block_count = code_blocks.size();
file_header.rtn_count = 1;
file_header.rtn_offset = image_size + sizeof file_header;
vmp2::v4::rtn_t rtn{ code_blocks.size() };
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 );
output.write( reinterpret_cast< const char * >( &rtn ), sizeof vmp2::v4::rtn_t::code_block_count );
for ( const auto &code_block : code_blocks )
{
const auto _code_block_size =
( code_block.vinstrs.size() * sizeof vm::instrs::virt_instr_t ) + sizeof vmp2::v3::code_block_t;
const auto _code_block_size = sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 );
vmp2::v3::code_block_t *_code_block =
reinterpret_cast< vmp2::v3::code_block_t * >( malloc( _code_block_size ) );
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->jcc = code_block.jcc;
_code_block->next_block_offset = _code_block_size;
_code_block->vinstr_count = code_block.vinstrs.size();
_code_block->jcc.num_block_addrs = code_block.jcc.block_addr.size();
for ( auto idx = 0u; idx < code_block.vinstrs.size(); ++idx )
_code_block->vinstr[ idx ] = code_block.vinstrs[ idx ];
// serialize jcc data...
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 ) );
// serialize virtual instructions...
auto vinstr_count = ( std::uint32_t )code_block.vinstrs.size();
output.write( reinterpret_cast< const char * >( &vinstr_count ), sizeof vinstr_count );
output.write( reinterpret_cast< const char * >( _code_block ), _code_block_size );
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 );
}
free( _code_block );
}
output.close();
}
else if ( parser.exists( "unpack" ) && parser.exists( "out" ) )

66
src/vmemu_t.cpp
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@ -209,6 +209,64 @@ namespace vm
code_blocks.push_back( branch_block );
break;
}
case vm::instrs::jcc_type::switch_case:
{
for ( auto _idx = 0u; _idx < _code_block.code_block.jcc.block_addr.size(); ++_idx )
{
if ( std::find( vip_begins.begin(), vip_begins.end(),
_code_block.code_block.jcc.block_addr[ _idx ] ) != vip_begins.end() )
continue;
std::uintptr_t rbp = 0ull;
std::uint32_t branch_rva =
( _code_block.code_block.jcc.block_addr[ _idx ] - g_vm_ctx->module_base ) +
g_vm_ctx->image_base;
// setup object globals so that the tracing will work...
code_block_data_t branch_block{ {}, nullptr, nullptr };
cc_block = &branch_block;
g_vm_ctx = _code_block.g_vm_ctx.get();
// restore register values...
if ( ( err = uc_context_restore( uc_ctx, _code_block.cpu_ctx->context ) ) )
{
std::printf( "> failed to restore emu context... reason = %d\n", err );
return false;
}
// restore stack values...
if ( ( err = uc_mem_write( uc_ctx, STACK_BASE, _code_block.cpu_ctx->stack, STACK_SIZE ) ) )
{
std::printf( "> failed to restore stack... reason = %d\n", err );
return false;
}
// get the address in rbp (top of vsp)... then patch the branch rva...
if ( ( err = uc_reg_read( uc_ctx, UC_X86_REG_RBP, &rbp ) ) )
{
std::printf( "> failed to read rbp... reason = %d\n", err );
return false;
}
// patch the branch rva...
if ( ( err = uc_mem_write( uc_ctx, rbp, &branch_rva, sizeof branch_rva ) ) )
{
std::printf( "> failed to patch branch rva... reason = %d\n", err );
return false;
}
std::printf( "> beginning execution at = 0x%p\n", _code_block.cpu_ctx->rip );
if ( ( err = uc_emu_start( uc_ctx, _code_block.cpu_ctx->rip, 0ull, 0ull, 0ull ) ) )
{
std::printf( "> error starting emu... reason = %d\n", err );
return false;
}
// push back new block that has been traced...
code_blocks.push_back( branch_block );
}
break;
}
}
}
@ -231,6 +289,13 @@ namespace vm
( code_block.jcc.block_addr[ 0 ] - g_vm_ctx->module_base ) + g_vm_ctx->image_base;
break;
}
case vm::instrs::jcc_type::switch_case:
{
for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
code_block.jcc.block_addr[ idx ] =
( code_block.jcc.block_addr[ idx ] - g_vm_ctx->module_base ) + g_vm_ctx->image_base;
break;
}
}
}
entries.push_back( code_block );
@ -415,7 +480,6 @@ namespace vm
}
obj->cc_block->code_block.vinstrs.push_back( vinstr.value() );
std::printf( "> %s %p\n", vm_handler.profile ? vm_handler.profile->name : "UNK", vm_handler_addr );
if ( vm_handler.profile )
{

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