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got it working with 1 call, needs more debugging, also testing on

Browse Source 
vmptest8.vmp.exe with advances backwards... have not tested on multiple
vms yet..
merge-requests/2/head
_xeroxz 4 years ago
parent 8204915da1
commit 4da6209abb
10 changed files with 8609 additions and 680 deletions
Show Stats Download Patch File Download Diff File

2
demo/demo.vcxproj
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@ -137,7 +137,7 @@
<SubSystem>Console</SubSystem>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>true</GenerateDebugInformation>
<GenerateDebugInformation>DebugFull</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemGroup>

8131
demo/test.hpp
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File diff suppressed because one or more lines are too long

30
src/compiler.cpp
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@ -87,6 +87,29 @@ namespace vm
( ++decrypt_key ) += vinstr.imm_size ? vinstr.imm_size / 8 : 0;
} );
const auto opcode_fetch = std::find_if(
vmctx->calc_jmp.begin(), vmctx->calc_jmp.end(), []( const zydis_instr_t &instr_data ) -> bool {
// mov/movsx/movzx rax/eax/ax/al, [rsi]
return instr_data.instr.operand_count > 1 &&
( instr_data.instr.mnemonic == ZYDIS_MNEMONIC_MOV ||
instr_data.instr.mnemonic == ZYDIS_MNEMONIC_MOVSX ||
instr_data.instr.mnemonic == ZYDIS_MNEMONIC_MOVZX ) &&
instr_data.instr.operands[ 0 ].type == ZYDIS_OPERAND_TYPE_REGISTER &&
util::reg::to64( instr_data.instr.operands[ 0 ].reg.value ) == ZYDIS_REGISTER_RAX &&
instr_data.instr.operands[ 1 ].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr_data.instr.operands[ 1 ].mem.base == ZYDIS_REGISTER_RSI;
} );
if ( opcode_fetch == vmctx->calc_jmp.end() )
{
std::printf( "> critical error trying to find opcode fetch inside of compiler_t::encrypt...\n" );
exit( 0 );
}
// sometimes there is a mov al, [rsi-1]... we want that disp...
if ( opcode_fetch->instr.operands[ 1 ].mem.disp.has_displacement )
decrypt_key += std::abs( opcode_fetch->instr.operands[ 1 ].mem.disp.value );
start_addr = decrypt_key - 1; // make it zero based...
std::for_each( virt_labels.begin(), virt_labels.end(), [ & ]( vm::vlabel_data &label ) {
decrypt_key = start_addr;
@ -123,22 +146,17 @@ namespace vm
else
{
std::for_each( label.vinstrs.begin(), label.vinstrs.end(), [ & ]( vm::vinstr_data &vinstr ) {
std::uint8_t opcode = vinstr.vm_handler, opcode_test = 0u;
std::uint8_t opcode = vinstr.vm_handler;
std::uint64_t operand = 0u;
std::uint64_t test_decrypt_key;
// encrypt opcode...
std::tie( opcode, decrypt_key ) =
vm::instrs::encrypt_operand( calc_jmp_transforms, vinstr.vm_handler, decrypt_key );
std::tie( opcode_test, test_decrypt_key ) =
vm::instrs::decrypt_operand( calc_jmp_transforms, opcode, decrypt_key );
// if there is an operand then we will encrypt that as well..
if ( vmctx->vm_handlers[ vinstr.vm_handler ].imm_size )
{
auto &vm_handler_transforms = vmctx->vm_handlers[ vinstr.vm_handler ].transforms;
std::tie( operand, decrypt_key ) =
vm::instrs::encrypt_operand( vm_handler_transforms, vinstr.operand, decrypt_key );
}

344
src/gen_code.hpp
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@ -0,0 +1,344 @@
#pragma once
#include <vmprofiler.hpp>
#include <fstream>
#include "compiler.h"
namespace gen
{
template< typename... Args > std::string string_format( const std::string &format, Args... args )
{
int size_s = std::snprintf( nullptr, 0, format.c_str(), args... ) + 1;
auto size = static_cast< size_t >( size_s );
auto buf = std::make_unique< char[] >( size );
std::snprintf( buf.get(), size, format.c_str(), args... );
return std::string( buf.get(), buf.get() + size - 1 );
}
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 >() );
}
inline std::string code( std::vector< vm::compiled_label_data > &labels, std::string image_path, vm::ctx_t vmctx )
{
std::string result, raw_file_array;
std::vector< std::uint8_t > raw_file;
open_binary_file( image_path, raw_file );
for ( auto idx = 0u; idx < raw_file.size(); ++idx )
raw_file_array.append( string_format( "0x%x, ", raw_file[ idx ] ) );
result.append( "#pragma once\n"
"#pragma section( \".xmp2\" )\n"
"#pragma comment( linker, \"/section:.xmp2,RWE\" ) \n\n" );
result.append( "namespace vm\n"
"{\n" );
result.append( R"( using u8 = unsigned char;
using s8 = signed char;
using u16 = unsigned short;
using s16 = signed short;
using u32 = unsigned int;
using s32 = signed int;
using u64 = unsigned long long;
using s64 = signed long long;
using __vmcall_t = void* (*)(...);
constexpr u8 IMAGE_DIRECTORY_ENTRY_BASERELOC = 5;
constexpr u8 IMAGE_REL_BASED_ABSOLUTE = 0;
constexpr u8 IMAGE_REL_BASED_DIR64 = 10;
typedef struct _IMAGE_DOS_HEADER
{
/* 0x0000 */ unsigned short e_magic;
/* 0x0002 */ unsigned short e_cblp;
/* 0x0004 */ unsigned short e_cp;
/* 0x0006 */ unsigned short e_crlc;
/* 0x0008 */ unsigned short e_cparhdr;
/* 0x000a */ unsigned short e_minalloc;
/* 0x000c */ unsigned short e_maxalloc;
/* 0x000e */ unsigned short e_ss;
/* 0x0010 */ unsigned short e_sp;
/* 0x0012 */ unsigned short e_csum;
/* 0x0014 */ unsigned short e_ip;
/* 0x0016 */ unsigned short e_cs;
/* 0x0018 */ unsigned short e_lfarlc;
/* 0x001a */ unsigned short e_ovno;
/* 0x001c */ unsigned short e_res[ 4 ];
/* 0x0024 */ unsigned short e_oemid;
/* 0x0026 */ unsigned short e_oeminfo;
/* 0x0028 */ unsigned short e_res2[ 10 ];
/* 0x003c */ long e_lfanew;
} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER; /* size: 0x0040 */
typedef struct _IMAGE_FILE_HEADER
{
/* 0x0000 */ unsigned short Machine;
/* 0x0002 */ unsigned short NumberOfSections;
/* 0x0004 */ unsigned long TimeDateStamp;
/* 0x0008 */ unsigned long PointerToSymbolTable;
/* 0x000c */ unsigned long NumberOfSymbols;
/* 0x0010 */ unsigned short SizeOfOptionalHeader;
/* 0x0012 */ unsigned short Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER; /* size: 0x0014 */
typedef struct _IMAGE_DATA_DIRECTORY
{
/* 0x0000 */ unsigned long VirtualAddress;
/* 0x0004 */ unsigned long Size;
} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY; /* size: 0x0008 */
typedef struct _IMAGE_OPTIONAL_HEADER64
{
/* 0x0000 */ unsigned short Magic;
/* 0x0002 */ unsigned char MajorLinkerVersion;
/* 0x0003 */ unsigned char MinorLinkerVersion;
/* 0x0004 */ unsigned long SizeOfCode;
/* 0x0008 */ unsigned long SizeOfInitializedData;
/* 0x000c */ unsigned long SizeOfUninitializedData;
/* 0x0010 */ unsigned long AddressOfEntryPoint;
/* 0x0014 */ unsigned long BaseOfCode;
/* 0x0018 */ unsigned __int64 ImageBase;
/* 0x0020 */ unsigned long SectionAlignment;
/* 0x0024 */ unsigned long FileAlignment;
/* 0x0028 */ unsigned short MajorOperatingSystemVersion;
/* 0x002a */ unsigned short MinorOperatingSystemVersion;
/* 0x002c */ unsigned short MajorImageVersion;
/* 0x002e */ unsigned short MinorImageVersion;
/* 0x0030 */ unsigned short MajorSubsystemVersion;
/* 0x0032 */ unsigned short MinorSubsystemVersion;
/* 0x0034 */ unsigned long Win32VersionValue;
/* 0x0038 */ unsigned long SizeOfImage;
/* 0x003c */ unsigned long SizeOfHeaders;
/* 0x0040 */ unsigned long CheckSum;
/* 0x0044 */ unsigned short Subsystem;
/* 0x0046 */ unsigned short DllCharacteristics;
/* 0x0048 */ unsigned __int64 SizeOfStackReserve;
/* 0x0050 */ unsigned __int64 SizeOfStackCommit;
/* 0x0058 */ unsigned __int64 SizeOfHeapReserve;
/* 0x0060 */ unsigned __int64 SizeOfHeapCommit;
/* 0x0068 */ unsigned long LoaderFlags;
/* 0x006c */ unsigned long NumberOfRvaAndSizes;
/* 0x0070 */ struct _IMAGE_DATA_DIRECTORY DataDirectory[ 16 ];
} IMAGE_OPTIONAL_HEADER64, *PIMAGE_OPTIONAL_HEADER64; /* size: 0x00f0 */
typedef struct _IMAGE_NT_HEADERS64
{
/* 0x0000 */ unsigned long Signature;
/* 0x0004 */ struct _IMAGE_FILE_HEADER FileHeader;
/* 0x0018 */ struct _IMAGE_OPTIONAL_HEADER64 OptionalHeader;
} IMAGE_NT_HEADERS64, *PIMAGE_NT_HEADERS64; /* size: 0x0108 */
typedef struct _IMAGE_SECTION_HEADER
{
/* 0x0000 */ unsigned char Name[ 8 ];
union
{
union
{
/* 0x0008 */ unsigned long PhysicalAddress;
/* 0x0008 */ unsigned long VirtualSize;
}; /* size: 0x0004 */
} /* size: 0x0004 */ Misc;
/* 0x000c */ unsigned long VirtualAddress;
/* 0x0010 */ unsigned long SizeOfRawData;
/* 0x0014 */ unsigned long PointerToRawData;
/* 0x0018 */ unsigned long PointerToRelocations;
/* 0x001c */ unsigned long PointerToLinenumbers;
/* 0x0020 */ unsigned short NumberOfRelocations;
/* 0x0022 */ unsigned short NumberOfLinenumbers;
/* 0x0024 */ unsigned long Characteristics;
} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER; /* size: 0x0028 */
typedef struct _IMAGE_BASE_RELOCATION
{
unsigned int VirtualAddress;
unsigned int SizeOfBlock;
} IMAGE_BASE_RELOCATION, *PIMAGE_BASE_RELOCATION;)" );
result.append( "\n\n\ttemplate < class T, class U > struct _pair_t\n"
"\t{\n"
"\t\tT first;\n"
"\t\tU second;\n"
"\t};\n\n" );
result.append( string_format( "\tconstexpr auto entry_rva = 0x%x;\n\n", vmctx.vm_entry_rva ) );
result.append( "\tenum class calls : u32\n"
"\t{\n" );
for ( auto idx = 0u; idx < labels.size(); ++idx )
result.append( string_format( "\t\t%s = 0x%x,\n", labels[ idx ].label_name, labels[ idx ].enc_alloc_rva ) );
result.append( "\t};\n\n" );
result.append( string_format( "\tinline _pair_t< u8, calls > call_map[%d] = \n"
"\t{\n",
labels.size() ) );
for ( auto idx = 0u; idx < labels.size(); ++idx )
result.append( string_format( "\t\t{ %d, calls::%s },\n", idx, labels[ idx ].label_name.c_str() ) );
result.append( "\t};\n\n" );
result.append( string_format( "\t__declspec(align(1)) struct _gen_data\n"
"\t{\n"
"\t\tu8 bin[%d] =\n"
"\t\t{\n"
"\t\t\t%s\n",
raw_file.size(), raw_file_array.c_str() ) );
result.append( "\t\t};\n\n" );
result.append( string_format( "\t\tu8 map_area[0x%x];\n\n", vmctx.image_size ) );
for ( auto &label : labels )
{
result.append(
string_format( "\t\tu8 __%s_vinstrs[%d] =\n", label.label_name.c_str(), label.vinstrs.size() ) );
result.append( "\t\t{\n\t\t\t" );
for ( auto &byte : label.vinstrs )
result.append( string_format( "0x%x, ", byte ) );
result.append( "\n\t\t};\n\n" );
}
result.append( string_format( "\t\tu8 __vmcall_shell_code[%d][15] =\n"
"\t\t{\n",
labels.size() ) );
for ( auto idx = 0u; idx < labels.size(); ++idx )
{
std::string jmp_code;
// two push instructions...
for ( auto i = 0u; i < 2; ++i )
{
jmp_code.append( "0x68, " ); // push opcode...
for ( auto _idx = 0u; _idx < 4; ++_idx )
jmp_code.append( "0x0, " );
}
// one jmp instruction...
jmp_code.append( "0xE9, " );
for ( auto i = 0u; i < 4; ++i )
jmp_code.append( "0x0, " );
result.append( string_format( "\t\t\t{ %s },\n", jmp_code.c_str() ) );
}
result.append( "\t\t};\n\n" );
result.append( R"( bool init()
{
static const auto _memcpy = []( void *dest, const void *src, size_t len ) -> void * {
char *d = ( char * )dest;
const char *s = ( char * )src;
while ( len-- )
*d++ = *s++;
return dest;
};
const auto dos_header = reinterpret_cast< IMAGE_DOS_HEADER * >( bin );
const auto nt_headers = reinterpret_cast< PIMAGE_NT_HEADERS64 >( bin + dos_header->e_lfanew );
_memcpy( map_area, bin, nt_headers->OptionalHeader.SizeOfHeaders );
auto sections = reinterpret_cast< PIMAGE_SECTION_HEADER >( ( u8 * )&nt_headers->OptionalHeader +
nt_headers->FileHeader.SizeOfOptionalHeader );
// map sections...
for ( u32 i = 0; i < nt_headers->FileHeader.NumberOfSections; ++i )
{
PIMAGE_SECTION_HEADER section = &sections[ i ];
_memcpy( ( void * )( map_area + section->VirtualAddress ),
( void * )( bin + section->PointerToRawData ), section->SizeOfRawData );
}
// handle relocations...
const auto reloc_dir = &nt_headers->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_BASERELOC ];
if ( reloc_dir->VirtualAddress )
{
auto reloc = reinterpret_cast< IMAGE_BASE_RELOCATION * >( map_area + reloc_dir->VirtualAddress );
for ( auto current_size = 0u; current_size < reloc_dir->Size; )
{
u32 reloc_count = ( reloc->SizeOfBlock - sizeof( IMAGE_BASE_RELOCATION ) ) / sizeof( u16 );
u16 *reloc_data = ( u16 * )( ( u8 * )reloc + sizeof( IMAGE_BASE_RELOCATION ) );
u8 *reloc_base = map_area + reloc->VirtualAddress;
for ( auto idx = 0; idx < reloc_count; ++idx, ++reloc_data )
{
u16 data = *reloc_data;
u16 type = data >> 12;
u16 offset = data & 0xFFF;
switch ( type )
{
case IMAGE_REL_BASED_ABSOLUTE:
break;
case IMAGE_REL_BASED_DIR64:
{
u64 *rva = ( u64 * )( reloc_base + offset );
*rva = ( u64 )( map_area + ( *rva - nt_headers->OptionalHeader.ImageBase ) );
break;
}
default:
break;
}
}
current_size += reloc->SizeOfBlock;
reloc = ( IMAGE_BASE_RELOCATION * )reloc_data;
}
}
// fix shellcode up...
for ( auto idx = 0u; idx < ( sizeof( __vmcall_shell_code ) / 15 ); ++idx )
{
// first push encrypted rva value...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 1 ] ) =
static_cast< u32 >( call_map[ idx ].second );
// second push encrypted rva value...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 6 ] ) =
static_cast< u32 >( call_map[ idx ].second );
// signed rip relative rva to vm entry...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 11 ] ) = reinterpret_cast< s32 >(
( map_area - ( reinterpret_cast< u64 >( &__vmcall_shell_code[ idx ] ) + 15 ) ) + entry_rva );
}
return true; // only a bool so i can use static/call init only once...
})" );
result.append( "\n\t};\n\n" );
result.append( "\t__declspec(allocate(\".xmp2\")) inline _gen_data gen_data;\n\n" );
result.append( R"( template < calls e_call, class T, class ... Ts > auto call(const Ts... args) -> T
{
static auto __init_result = gen_data.init();
__vmcall_t vmcall = nullptr;
for ( auto idx = 0u; idx < sizeof( call_map ) / sizeof( _pair_t< u8, calls > ); ++idx )
if ( call_map[ idx ].second == e_call )
vmcall = reinterpret_cast< __vmcall_t >( &gen_data.__vmcall_shell_code[ idx ] );
return reinterpret_cast< T >( vmcall( args... ) );
})" );
result.append( "\n}" );
return result;
}
} // namespace gen

339
src/main.cpp
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@ -11,6 +11,7 @@
#include "parser.tab.h"
#include "vmasm.hpp"
#include "vmprofiler.hpp"
#include "gen_code.hpp"
extern FILE *yyin;
extern "C" int yywrap()
@ -23,342 +24,6 @@ void yyerror( char *msg )
std::printf( "[!] parsing failure: %s\n", msg );
}
template < typename... Args > std::string string_format( const std::string &format, Args... args )
{
int size_s = std::snprintf( nullptr, 0, format.c_str(), args... ) + 1;
auto size = static_cast< size_t >( size_s );
auto buf = std::make_unique< char[] >( size );
std::snprintf( buf.get(), size, format.c_str(), args... );
return std::string( buf.get(), buf.get() + size - 1 );
}
static 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 >() );
}
std::string gen_code( std::vector< vm::compiled_label_data > &labels, std::string image_path, vm::ctx_t vmctx )
{
std::string result, raw_file_array;
std::vector< std::uint8_t > raw_file;
open_binary_file( image_path, raw_file );
for ( auto idx = 0u; idx < raw_file.size(); ++idx )
raw_file_array.append( string_format( "0x%x, ", raw_file[ idx ] ) );
result.append( "#pragma once\n"
"#pragma section( \".xmp2\" )\n"
"#pragma comment( linker, \"/section:.xmp2,RWE\" ) \n\n" );
result.append( "namespace vm\n"
"{\n" );
result.append( R"( using u8 = unsigned char;
using s8 = signed char;
using u16 = unsigned short;
using s16 = signed short;
using u32 = unsigned int;
using s32 = signed int;
using u64 = unsigned long long;
using s64 = signed long long;
using __vmcall_t = void* (*)(...);
constexpr u8 IMAGE_DIRECTORY_ENTRY_BASERELOC = 5;
constexpr u8 IMAGE_REL_BASED_ABSOLUTE = 0;
constexpr u8 IMAGE_REL_BASED_DIR64 = 10;
typedef struct _IMAGE_DOS_HEADER
{
/* 0x0000 */ unsigned short e_magic;
/* 0x0002 */ unsigned short e_cblp;
/* 0x0004 */ unsigned short e_cp;
/* 0x0006 */ unsigned short e_crlc;
/* 0x0008 */ unsigned short e_cparhdr;
/* 0x000a */ unsigned short e_minalloc;
/* 0x000c */ unsigned short e_maxalloc;
/* 0x000e */ unsigned short e_ss;
/* 0x0010 */ unsigned short e_sp;
/* 0x0012 */ unsigned short e_csum;
/* 0x0014 */ unsigned short e_ip;
/* 0x0016 */ unsigned short e_cs;
/* 0x0018 */ unsigned short e_lfarlc;
/* 0x001a */ unsigned short e_ovno;
/* 0x001c */ unsigned short e_res[ 4 ];
/* 0x0024 */ unsigned short e_oemid;
/* 0x0026 */ unsigned short e_oeminfo;
/* 0x0028 */ unsigned short e_res2[ 10 ];
/* 0x003c */ long e_lfanew;
} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER; /* size: 0x0040 */
typedef struct _IMAGE_FILE_HEADER
{
/* 0x0000 */ unsigned short Machine;
/* 0x0002 */ unsigned short NumberOfSections;
/* 0x0004 */ unsigned long TimeDateStamp;
/* 0x0008 */ unsigned long PointerToSymbolTable;
/* 0x000c */ unsigned long NumberOfSymbols;
/* 0x0010 */ unsigned short SizeOfOptionalHeader;
/* 0x0012 */ unsigned short Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER; /* size: 0x0014 */
typedef struct _IMAGE_DATA_DIRECTORY
{
/* 0x0000 */ unsigned long VirtualAddress;
/* 0x0004 */ unsigned long Size;
} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY; /* size: 0x0008 */
typedef struct _IMAGE_OPTIONAL_HEADER64
{
/* 0x0000 */ unsigned short Magic;
/* 0x0002 */ unsigned char MajorLinkerVersion;
/* 0x0003 */ unsigned char MinorLinkerVersion;
/* 0x0004 */ unsigned long SizeOfCode;
/* 0x0008 */ unsigned long SizeOfInitializedData;
/* 0x000c */ unsigned long SizeOfUninitializedData;
/* 0x0010 */ unsigned long AddressOfEntryPoint;
/* 0x0014 */ unsigned long BaseOfCode;
/* 0x0018 */ unsigned __int64 ImageBase;
/* 0x0020 */ unsigned long SectionAlignment;
/* 0x0024 */ unsigned long FileAlignment;
/* 0x0028 */ unsigned short MajorOperatingSystemVersion;
/* 0x002a */ unsigned short MinorOperatingSystemVersion;
/* 0x002c */ unsigned short MajorImageVersion;
/* 0x002e */ unsigned short MinorImageVersion;
/* 0x0030 */ unsigned short MajorSubsystemVersion;
/* 0x0032 */ unsigned short MinorSubsystemVersion;
/* 0x0034 */ unsigned long Win32VersionValue;
/* 0x0038 */ unsigned long SizeOfImage;
/* 0x003c */ unsigned long SizeOfHeaders;
/* 0x0040 */ unsigned long CheckSum;
/* 0x0044 */ unsigned short Subsystem;
/* 0x0046 */ unsigned short DllCharacteristics;
/* 0x0048 */ unsigned __int64 SizeOfStackReserve;
/* 0x0050 */ unsigned __int64 SizeOfStackCommit;
/* 0x0058 */ unsigned __int64 SizeOfHeapReserve;
/* 0x0060 */ unsigned __int64 SizeOfHeapCommit;
/* 0x0068 */ unsigned long LoaderFlags;
/* 0x006c */ unsigned long NumberOfRvaAndSizes;
/* 0x0070 */ struct _IMAGE_DATA_DIRECTORY DataDirectory[ 16 ];
} IMAGE_OPTIONAL_HEADER64, *PIMAGE_OPTIONAL_HEADER64; /* size: 0x00f0 */
typedef struct _IMAGE_NT_HEADERS64
{
/* 0x0000 */ unsigned long Signature;
/* 0x0004 */ struct _IMAGE_FILE_HEADER FileHeader;
/* 0x0018 */ struct _IMAGE_OPTIONAL_HEADER64 OptionalHeader;
} IMAGE_NT_HEADERS64, *PIMAGE_NT_HEADERS64; /* size: 0x0108 */
typedef struct _IMAGE_SECTION_HEADER
{
/* 0x0000 */ unsigned char Name[ 8 ];
union
{
union
{
/* 0x0008 */ unsigned long PhysicalAddress;
/* 0x0008 */ unsigned long VirtualSize;
}; /* size: 0x0004 */
} /* size: 0x0004 */ Misc;
/* 0x000c */ unsigned long VirtualAddress;
/* 0x0010 */ unsigned long SizeOfRawData;
/* 0x0014 */ unsigned long PointerToRawData;
/* 0x0018 */ unsigned long PointerToRelocations;
/* 0x001c */ unsigned long PointerToLinenumbers;
/* 0x0020 */ unsigned short NumberOfRelocations;
/* 0x0022 */ unsigned short NumberOfLinenumbers;
/* 0x0024 */ unsigned long Characteristics;
} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER; /* size: 0x0028 */
typedef struct _IMAGE_BASE_RELOCATION
{
unsigned int VirtualAddress;
unsigned int SizeOfBlock;
} IMAGE_BASE_RELOCATION, *PIMAGE_BASE_RELOCATION;)" );
result.append( "\n\n\ttemplate < class T, class U > struct _pair_t\n"
"\t{\n"
"\t\tT first;\n"
"\t\tU second;\n"
"\t};\n\n" );
result.append( string_format( "\tconstexpr auto entry_rva = 0x%x;\n\n", vmctx.vm_entry_rva ) );
result.append( "\tenum class calls : u32\n"
"\t{\n" );
for ( auto idx = 0u; idx < labels.size(); ++idx )
result.append( string_format( "\t\t%s = 0x%x,\n", labels[ idx ].label_name, labels[ idx ].enc_alloc_rva ) );
result.append( "\t};\n\n" );
result.append( string_format( "\tinline _pair_t< u8, calls > call_map[%d] = \n"
"\t{\n",
labels.size() ) );
for ( auto idx = 0u; idx < labels.size(); ++idx )
result.append( string_format( "\t\t{ %d, calls::%s },\n", idx, labels[ idx ].label_name.c_str() ) );
result.append( "\t};\n\n" );
result.append( string_format( "\t__declspec(align(1)) struct _gen_data\n"
"\t{\n"
"\t\tu8 bin[%d] =\n"
"\t\t{\n"
"\t\t\t%s\n",
raw_file.size(), raw_file_array.c_str() ) );
result.append( "\t\t};\n\n" );
result.append( string_format( "\t\tu8 map_area[0x%x];\n\n", vmctx.image_size ) );
for ( auto &label : labels )
{
result.append( string_format( "\t\tu8 __%s_vinstrs[%d] =\n", label.label_name.c_str(), label.vinstrs.size() ) );
result.append( "\t\t{\n\t\t\t" );
for (auto& byte : label.vinstrs)
result.append( string_format( "0x%x, ", byte ) );
result.append( "\n\t\t};\n\n" );
}
result.append( string_format( "\t\tu8 __vmcall_shell_code[%d][15] =\n"
"\t\t{\n",
labels.size() ) );
for ( auto idx = 0u; idx < labels.size(); ++idx )
{
std::string jmp_code;
// two push instructions...
for ( auto i = 0u; i < 2; ++i )
{
jmp_code.append( "0x68, " ); // push opcode...
for ( auto _idx = 0u; _idx < 4; ++_idx )
jmp_code.append( "0x0, " );
}
// one jmp instruction...
jmp_code.append( "0xE9, " );
for ( auto i = 0u; i < 4; ++i )
jmp_code.append( "0x0, " );
result.append( string_format( "\t\t\t{ %s },\n", jmp_code.c_str() ) );
}
result.append( "\t\t};\n\n" );
result.append( R"( bool init()
{
static const auto _memcpy = []( void *dest, const void *src, size_t len ) -> void * {
char *d = ( char * )dest;
const char *s = ( char * )src;
while ( len-- )
*d++ = *s++;
return dest;
};
const auto dos_header = reinterpret_cast< IMAGE_DOS_HEADER * >( bin );
const auto nt_headers = reinterpret_cast< PIMAGE_NT_HEADERS64 >( bin + dos_header->e_lfanew );
_memcpy( map_area, bin, nt_headers->OptionalHeader.SizeOfHeaders );
auto sections = reinterpret_cast< PIMAGE_SECTION_HEADER >( ( u8 * )&nt_headers->OptionalHeader +
nt_headers->FileHeader.SizeOfOptionalHeader );
// map sections...
for ( u32 i = 0; i < nt_headers->FileHeader.NumberOfSections; ++i )
{
PIMAGE_SECTION_HEADER section = &sections[ i ];
_memcpy( ( void * )( map_area + section->VirtualAddress ),
( void * )( bin + section->PointerToRawData ), section->SizeOfRawData );
}
// handle relocations...
const auto reloc_dir = &nt_headers->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_BASERELOC ];
if ( reloc_dir->VirtualAddress )
{
auto reloc = reinterpret_cast< IMAGE_BASE_RELOCATION * >( map_area + reloc_dir->VirtualAddress );
for ( auto current_size = 0u; current_size < reloc_dir->Size; )
{
u32 reloc_count = ( reloc->SizeOfBlock - sizeof( IMAGE_BASE_RELOCATION ) ) / sizeof( u16 );
u16 *reloc_data = ( u16 * )( ( u8 * )reloc + sizeof( IMAGE_BASE_RELOCATION ) );
u8 *reloc_base = map_area + reloc->VirtualAddress;
for ( auto idx = 0; idx < reloc_count; ++idx, ++reloc_data )
{
u16 data = *reloc_data;
u16 type = data >> 12;
u16 offset = data & 0xFFF;
switch ( type )
{
case IMAGE_REL_BASED_ABSOLUTE:
break;
case IMAGE_REL_BASED_DIR64:
{
u64 *rva = ( u64 * )( reloc_base + offset );
*rva = ( u64 )( map_area + ( *rva - nt_headers->OptionalHeader.ImageBase ) );
break;
}
default:
break;
}
}
current_size += reloc->SizeOfBlock;
reloc = ( IMAGE_BASE_RELOCATION * )reloc_data;
}
}
// fix shellcode up...
for ( auto idx = 0u; idx < ( sizeof( __vmcall_shell_code ) / 15 ); ++idx )
{
// first push encrypted rva value...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 1 ] ) =
static_cast< u32 >( call_map[ idx ].second );
// second push encrypted rva value...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 6 ] ) =
static_cast< u32 >( call_map[ idx ].second );
// signed rip relative rva to vm entry...
*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 11 ] ) = reinterpret_cast< s32 >(
( map_area - ( reinterpret_cast< u64 >( &__vmcall_shell_code[ idx ] ) + 15 ) ) + entry_rva );
}
return true; // only a bool so i can use static/call init only once...
})" );
result.append( "\n\t};\n\n" );
result.append( "\t__declspec(allocate(\".xmp2\")) inline _gen_data gen_data;\n\n" );
result.append( R"( template < calls e_call, class T, class ... Ts > auto call(const Ts... args) -> T
{
static auto __init_result = gen_data.init();
__vmcall_t vmcall = nullptr;
for ( auto idx = 0u; idx < sizeof( call_map ) / sizeof( _pair_t< u8, calls > ); ++idx )
if ( call_map[ idx ].second == e_call )
vmcall = reinterpret_cast< __vmcall_t >( &gen_data.__vmcall_shell_code[ idx ] );
return reinterpret_cast< T >( vmcall( args... ) );
})" );
result.append( "\n}" );
return result;
}
int __cdecl main( int argc, const char *argv[] )
{
argparse::argument_parser_t argp( "vmassembler", "virtual instruction assembler" );
@ -470,7 +135,7 @@ int __cdecl main( int argc, const char *argv[] )
}
}
const auto cpp_result = gen_code( compiled_labels, argp.get< std::string >( "vmpbin" ), vmctx );
const auto cpp_result = gen::code( compiled_labels, argp.get< std::string >( "vmpbin" ), vmctx );
std::ofstream output( argp.get< std::string >( "out" ) );
output.write( cpp_result.data(), cpp_result.size() );
output.close();

277
src/test.hpp
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File diff suppressed because one or more lines are too long

88
src/test.vasm
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@ -1,9 +1,93 @@
get_hello:
LCONSTQ 0x10000
SREGQ 0x90
SREGQ 0x88
SREGQ 0x80
SREGQ 0x78
SREGQ 0x70
SREGQ 0x68
SREGQ 0x60
SREGQ 0x58
SREGQ 0x50
SREGQ 0x48
SREGQ 0x40
SREGQ 0x38
SREGQ 0x30
SREGQ 0x28
SREGQ 0x20
SREGQ 0x18
SREGQ 0x10
SREGQ 0x8
SREGQ 0x0
LCONSTQ 0x6F6C6C6568
SREGQ 0x78
SREGQ 0x0
SREGQ 0x0
LREGQ 0x0
LREGQ 0x8
LREGQ 0x10
LREGQ 0x18
LREGQ 0x20
LREGQ 0x28
LREGQ 0x30
LREGQ 0x38
LREGQ 0x40
LREGQ 0x48
LREGQ 0x50
LREGQ 0x58
LREGQ 0x60
LREGQ 0x68
LREGQ 0x70
LREGQ 0x78
LREGQ 0x80
LREGQ 0x88
LREGQ 0x90
VMEXIT
get_world:
LCONSTQ 0x10000
SREGQ 0x90
SREGQ 0x88
SREGQ 0x80
SREGQ 0x78
SREGQ 0x70
SREGQ 0x68
SREGQ 0x60
SREGQ 0x58
SREGQ 0x50
SREGQ 0x48
SREGQ 0x40
SREGQ 0x38
SREGQ 0x30
SREGQ 0x28
SREGQ 0x20
SREGQ 0x18
SREGQ 0x10
SREGQ 0x8
SREGQ 0x0
LCONSTQ 0x646C726F77
SREGQ 0x78
SREGQ 0x0
SREGQ 0x0
LREGQ 0x0
LREGQ 0x8
LREGQ 0x10
LREGQ 0x18
LREGQ 0x20
LREGQ 0x28
LREGQ 0x30
LREGQ 0x38
LREGQ 0x40
LREGQ 0x48
LREGQ 0x50
LREGQ 0x58
LREGQ 0x60
LREGQ 0x68
LREGQ 0x70
LREGQ 0x78
LREGQ 0x80
LREGQ 0x88
LREGQ 0x90
VMEXIT

1
src/vmassembler.vcxproj
Unescape View File

@ -131,6 +131,7 @@
<ClInclude Include="..\dependencies\vmprofiler\include\Zydis\Zydis.h" />
<ClInclude Include="..\dependencies\xtils\xtils.hpp" />
<ClInclude Include="compiler.h" />
<ClInclude Include="gen_code.hpp" />
<ClInclude Include="gen_header_template.h" />
<ClInclude Include="parser.h" />
<ClInclude Include="parser.tab.h" />

3
src/vmassembler.vcxproj.filters
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@ -237,6 +237,9 @@
<ClInclude Include="test.hpp">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="gen_code.hpp">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<ResourceCompile Include="icon.rc">

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