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@ -23,6 +23,335 @@ void yyerror( char *msg )
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std::printf( "[!] parsing failure: %s\n", msg );
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}
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template < typename... Args > std::string string_format( const std::string &format, Args... args )
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{
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int size_s = std::snprintf( nullptr, 0, format.c_str(), args... ) + 1;
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auto size = static_cast< size_t >( size_s );
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auto buf = std::make_unique< char[] >( size );
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std::snprintf( buf.get(), size, format.c_str(), args... );
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return std::string( buf.get(), buf.get() + size - 1 );
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}
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static void open_binary_file( const std::string &file, std::vector< uint8_t > &data )
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{
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std::ifstream fstr( file, std::ios::binary );
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fstr.unsetf( std::ios::skipws );
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fstr.seekg( 0, std::ios::end );
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const auto file_size = fstr.tellg();
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fstr.seekg( NULL, std::ios::beg );
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data.reserve( static_cast< uint32_t >( file_size ) );
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data.insert( data.begin(), std::istream_iterator< uint8_t >( fstr ), std::istream_iterator< uint8_t >() );
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}
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std::string gen_code( std::vector< vm::compiled_label_data > &labels, std::string image_path, vm::ctx_t vmctx )
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{
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std::string result, raw_file_array;
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std::vector< std::uint8_t > raw_file;
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open_binary_file( image_path, raw_file );
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for ( auto idx = 0u; idx < raw_file.size(); ++idx )
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raw_file_array.append( string_format( "0x%x, ", raw_file[ idx ] ) );
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result.append( "#pragma once\n"
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"#pragma section( \".xmp2\" )\n"
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"#pragma comment( linker, \"/section:.xmp2,RWE\" ) \n\n" );
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result.append( "namespace vm\n"
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"{\n" );
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result.append( R"( using u8 = unsigned char;
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using s8 = signed char;
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using u16 = unsigned short;
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using s16 = signed short;
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using u32 = unsigned int;
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using s32 = signed int;
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using u64 = unsigned long long;
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using s64 = signed long long;
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using __vmcall_t = void* (*)(...);
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constexpr u8 IMAGE_DIRECTORY_ENTRY_BASERELOC = 8;
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constexpr u8 IMAGE_REL_BASED_ABSOLUTE = 0;
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constexpr u8 IMAGE_REL_BASED_DIR64 = 10;
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typedef struct _IMAGE_DOS_HEADER
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{
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/* 0x0000 */ unsigned short e_magic;
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/* 0x0002 */ unsigned short e_cblp;
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/* 0x0004 */ unsigned short e_cp;
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/* 0x0006 */ unsigned short e_crlc;
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/* 0x0008 */ unsigned short e_cparhdr;
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/* 0x000a */ unsigned short e_minalloc;
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/* 0x000c */ unsigned short e_maxalloc;
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/* 0x000e */ unsigned short e_ss;
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/* 0x0010 */ unsigned short e_sp;
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/* 0x0012 */ unsigned short e_csum;
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/* 0x0014 */ unsigned short e_ip;
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/* 0x0016 */ unsigned short e_cs;
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/* 0x0018 */ unsigned short e_lfarlc;
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/* 0x001a */ unsigned short e_ovno;
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/* 0x001c */ unsigned short e_res[ 4 ];
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/* 0x0024 */ unsigned short e_oemid;
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/* 0x0026 */ unsigned short e_oeminfo;
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/* 0x0028 */ unsigned short e_res2[ 10 ];
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/* 0x003c */ long e_lfanew;
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} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER; /* size: 0x0040 */
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typedef struct _IMAGE_FILE_HEADER
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{
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/* 0x0000 */ unsigned short Machine;
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/* 0x0002 */ unsigned short NumberOfSections;
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/* 0x0004 */ unsigned long TimeDateStamp;
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/* 0x0008 */ unsigned long PointerToSymbolTable;
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/* 0x000c */ unsigned long NumberOfSymbols;
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/* 0x0010 */ unsigned short SizeOfOptionalHeader;
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/* 0x0012 */ unsigned short Characteristics;
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} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER; /* size: 0x0014 */
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typedef struct _IMAGE_DATA_DIRECTORY
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{
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/* 0x0000 */ unsigned long VirtualAddress;
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/* 0x0004 */ unsigned long Size;
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} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY; /* size: 0x0008 */
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typedef struct _IMAGE_OPTIONAL_HEADER64
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{
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/* 0x0000 */ unsigned short Magic;
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/* 0x0002 */ unsigned char MajorLinkerVersion;
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/* 0x0003 */ unsigned char MinorLinkerVersion;
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/* 0x0004 */ unsigned long SizeOfCode;
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/* 0x0008 */ unsigned long SizeOfInitializedData;
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/* 0x000c */ unsigned long SizeOfUninitializedData;
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/* 0x0010 */ unsigned long AddressOfEntryPoint;
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/* 0x0014 */ unsigned long BaseOfCode;
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/* 0x0018 */ unsigned __int64 ImageBase;
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/* 0x0020 */ unsigned long SectionAlignment;
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/* 0x0024 */ unsigned long FileAlignment;
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/* 0x0028 */ unsigned short MajorOperatingSystemVersion;
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/* 0x002a */ unsigned short MinorOperatingSystemVersion;
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/* 0x002c */ unsigned short MajorImageVersion;
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/* 0x002e */ unsigned short MinorImageVersion;
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/* 0x0030 */ unsigned short MajorSubsystemVersion;
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/* 0x0032 */ unsigned short MinorSubsystemVersion;
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/* 0x0034 */ unsigned long Win32VersionValue;
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/* 0x0038 */ unsigned long SizeOfImage;
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/* 0x003c */ unsigned long SizeOfHeaders;
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/* 0x0040 */ unsigned long CheckSum;
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/* 0x0044 */ unsigned short Subsystem;
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/* 0x0046 */ unsigned short DllCharacteristics;
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/* 0x0048 */ unsigned __int64 SizeOfStackReserve;
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/* 0x0050 */ unsigned __int64 SizeOfStackCommit;
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/* 0x0058 */ unsigned __int64 SizeOfHeapReserve;
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/* 0x0060 */ unsigned __int64 SizeOfHeapCommit;
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/* 0x0068 */ unsigned long LoaderFlags;
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/* 0x006c */ unsigned long NumberOfRvaAndSizes;
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/* 0x0070 */ struct _IMAGE_DATA_DIRECTORY DataDirectory[ 16 ];
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} IMAGE_OPTIONAL_HEADER64, *PIMAGE_OPTIONAL_HEADER64; /* size: 0x00f0 */
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typedef struct _IMAGE_NT_HEADERS64
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{
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/* 0x0000 */ unsigned long Signature;
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/* 0x0004 */ struct _IMAGE_FILE_HEADER FileHeader;
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/* 0x0018 */ struct _IMAGE_OPTIONAL_HEADER64 OptionalHeader;
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} IMAGE_NT_HEADERS64, *PIMAGE_NT_HEADERS64; /* size: 0x0108 */
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typedef struct _IMAGE_SECTION_HEADER
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{
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/* 0x0000 */ unsigned char Name[ 8 ];
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union
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{
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union
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{
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/* 0x0008 */ unsigned long PhysicalAddress;
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/* 0x0008 */ unsigned long VirtualSize;
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}; /* size: 0x0004 */
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} /* size: 0x0004 */ Misc;
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/* 0x000c */ unsigned long VirtualAddress;
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/* 0x0010 */ unsigned long SizeOfRawData;
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/* 0x0014 */ unsigned long PointerToRawData;
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/* 0x0018 */ unsigned long PointerToRelocations;
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/* 0x001c */ unsigned long PointerToLinenumbers;
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/* 0x0020 */ unsigned short NumberOfRelocations;
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/* 0x0022 */ unsigned short NumberOfLinenumbers;
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/* 0x0024 */ unsigned long Characteristics;
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} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER; /* size: 0x0028 */
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typedef struct _IMAGE_BASE_RELOCATION
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{
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unsigned int VirtualAddress;
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unsigned int SizeOfBlock;
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} IMAGE_BASE_RELOCATION, *PIMAGE_BASE_RELOCATION;)" );
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result.append( "\n\n\ttemplate < class T, class U > struct _pair_t\n"
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"\t{\n"
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"\t\tT first;\n"
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"\t\tU second;\n"
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"\t};\n\n" );
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result.append( string_format( "\tconstexpr auto entry_rva = 0x%x;\n\n", vmctx.vm_entry_rva ) );
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result.append( "\tenum class calls : u32\n"
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"\t{\n" );
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for ( auto idx = 0u; idx < labels.size(); ++idx )
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result.append( string_format( "\t\t%s = 0x%x,\n", labels[ idx ].label_name, labels[ idx ].enc_alloc_rva ) );
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result.append( "\t};\n\n" );
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result.append( string_format( "\tinline _pair_t< u8, calls > call_map[%d] = \n"
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"\t{\n",
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labels.size() ) );
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for ( auto idx = 0u; idx < labels.size(); ++idx )
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result.append( string_format( "\t\t{ %d, calls::%s },\n", idx, labels[ idx ].label_name.c_str() ) );
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result.append( "\t};\n\n" );
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result.append( string_format( "\t__declspec(align(1)) struct _gen_data\n"
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"\t{\n"
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"\t\tu8 bin[%d] =\n"
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"\t\t{\n"
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"\t\t\t%s\n",
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raw_file_array.size(), raw_file_array.c_str() ) );
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result.append( "\t\t};\n\n" );
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result.append( string_format( "\t\tu8 map_area[0x%x];\n\n", vmctx.image_size ) );
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result.append( string_format( "\t\tu8 __vlabels[%d] =\n", labels.size() ) );
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result.append( string_format( "\t\tu8 __vmcall_shell_code[%d][15] =\n"
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"\t\t{\n",
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labels.size() ) );
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for ( auto idx = 0u; idx < labels.size(); ++idx )
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{
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std::string jmp_code;
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// two push instructions...
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for ( auto i = 0u; i < 2; ++i )
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{
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jmp_code.append( "0x68, " ); // push opcode...
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for ( auto _idx = 0u; _idx < 4; ++_idx )
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jmp_code.append( "0x0, " );
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}
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// one jmp instruction...
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jmp_code.append( "0xE9, " );
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for (auto i = 0u; i < 4; ++i)
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jmp_code.append( "0x0, " );
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result.append( string_format( "\t\t\t{ %s },\n", jmp_code.c_str() ) );
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}
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result.append( "\t\t};\n\n" );
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result.append( R"( bool init()
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{
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static const auto _memcpy = []( void *dest, const void *src, size_t len ) -> void * {
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char *d = ( char * )dest;
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const char *s = ( char * )src;
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while ( len-- )
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*d++ = *s++;
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return dest;
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};
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const auto dos_header = reinterpret_cast< IMAGE_DOS_HEADER * >( bin );
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const auto nt_headers = reinterpret_cast< PIMAGE_NT_HEADERS64 >( bin + dos_header->e_lfanew );
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_memcpy( map_area, bin, nt_headers->OptionalHeader.SizeOfHeaders );
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auto sections = reinterpret_cast< PIMAGE_SECTION_HEADER >( ( u8 * )&nt_headers->OptionalHeader +
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nt_headers->FileHeader.SizeOfOptionalHeader );
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// map sections...
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for ( u32 i = 0; i < nt_headers->FileHeader.NumberOfSections; ++i )
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{
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PIMAGE_SECTION_HEADER section = §ions[ i ];
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_memcpy( ( void * )( map_area + section->VirtualAddress ),
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( void * )( bin + section->PointerToRawData ), section->SizeOfRawData );
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}
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// handle relocations...
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const auto reloc_dir = &nt_headers->OptionalHeader.DataDirectory[ IMAGE_DIRECTORY_ENTRY_BASERELOC ];
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if ( reloc_dir->VirtualAddress )
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{
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auto reloc = reinterpret_cast< IMAGE_BASE_RELOCATION * >( map_area + reloc_dir->VirtualAddress );
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for ( auto current_size = 0u; current_size < reloc_dir->Size; )
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{
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u32 reloc_count = ( reloc->SizeOfBlock - sizeof( IMAGE_BASE_RELOCATION ) ) / sizeof( u16 );
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u16 *reloc_data = ( u16 * )( ( u8 * )reloc + sizeof( IMAGE_BASE_RELOCATION ) );
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u8 *reloc_base = map_area + reloc->VirtualAddress;
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for ( auto idx = 0; idx < reloc_count; ++idx, ++reloc_data )
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{
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u16 data = *reloc_data;
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u16 type = data >> 12;
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u16 offset = data & 0xFFF;
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switch ( type )
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{
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case IMAGE_REL_BASED_ABSOLUTE:
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break;
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case IMAGE_REL_BASED_DIR64:
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{
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u64 *rva = ( u64 * )( reloc_base + offset );
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*rva = ( u64 )( map_area + ( *rva - nt_headers->OptionalHeader.ImageBase ) );
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break;
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}
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default:
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break;
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}
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}
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current_size += reloc->SizeOfBlock;
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reloc = ( IMAGE_BASE_RELOCATION * )reloc_data;
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}
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}
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// fix shellcode up...
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for ( auto idx = 0u; idx < ( sizeof( __vmcall_shell_code ) / 15 ); ++idx )
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{
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// first push encrypted rva value...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 1 ] ) =
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static_cast< u32 >( call_map[ idx ].second );
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// second push encrypted rva value...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 6 ] ) =
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static_cast< u32 >( call_map[ idx ].second );
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// signed rip relative rva to vm entry...
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*reinterpret_cast< u32 * >( &__vmcall_shell_code[ idx ][ 11 ] ) = reinterpret_cast< s32 >(
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( map_area - ( reinterpret_cast< u64 >( &__vmcall_shell_code[ idx ] ) + 15 ) ) + entry_rva );
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}
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return true; // only a bool so i can use static/call init only once...
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})" );
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result.append( "\n\t};\n\n" );
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result.append( "\t__declspec(allocate(\".xmp2 \")) inline _gen_data gen_data;\n\n" );
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result.append( R"( template < calls e_call, class T, class ... Ts > auto call(const Ts... args) -> T
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{
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static auto __init_result = gen_data.init();
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__vmcall_t vmcall = nullptr;
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for ( auto idx = 0u; idx < sizeof( call_map ) / sizeof( _pair_t< u8, calls > ); ++idx )
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if ( call_map[ idx ].second == e_call )
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vmcall = reinterpret_cast< __vmcall_t >( &gen_data.__vmcall_shell_code[ idx ] );
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return reinterpret_cast< T >( vmcall( args... ) );
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})" );
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result.append( "\n}" );
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return result;
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}
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int __cdecl main( int argc, const char *argv[] )
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{
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argparse::argument_parser_t argp( "vmassembler", "virtual instruction assembler" );
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@ -34,7 +363,7 @@ int __cdecl main( int argc, const char *argv[] )
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argp.add_argument().names( { "--vmpbin", "--bin" } ).description( "path to protected binary..." ).required( true );
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argp.add_argument().names( { "--vmentry", "--entry" } ).description( "rva to vm entry..." ).required( true );
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argp.add_argument().name( { "--output" } ).description( "output file name and path..." ).required( true );
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argp.add_argument().names( { "--out", "--output" } ).description( "output file name and path..." ).required( true );
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argp.enable_help();
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auto err = argp.parse( argc, argv );
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@ -135,5 +464,10 @@ int __cdecl main( int argc, const char *argv[] )
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}
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}
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std::printf( "\n" );
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const auto cpp_result = gen_code( compiled_labels, argp.get< std::string >( "vmpbin" ), vmctx );
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std::ofstream output( argp.get< std::string >( "out" ) );
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output.write( cpp_result.data(), cpp_result.size() );
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output.close();
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std::printf( "> generated header file...\n" );
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}
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