porting project to support linux... See merge request vmp2/vmemu!14merge-requests/15/merge
_xeroxz
3 years ago
commit
e0d756c252
@ -1 +1 @@
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Subproject commit 1b6875d18825529907289bc87990fed5d99e7f96
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Subproject commit dd7d3777ad10373d0eeb23c118e4bdcfc7464494
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@ -1,402 +1,399 @@
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#include "unpacker.hpp"
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#include "vmemu_t.hpp"
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#include <cli-parser.hpp>
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#include <fstream>
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#include <iostream>
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#include <xtils.hpp>
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int __cdecl main( int argc, const char *argv[] )
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{
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argparse::argument_parser_t parser( "VMEmu", "VMProtect 2 VM Handler Emulator" );
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parser.add_argument().name( "--vmentry" ).description( "relative virtual address to a vm entry..." );
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parser.add_argument().name( "--bin" ).description( "path to unpacked virtualized binary..." );
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parser.add_argument().name( "--out" ).description( "output file name..." );
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parser.add_argument().name( "--unpack" ).description( "unpack a vmp2 binary..." );
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parser.add_argument().names( { "-f", "--force" } ).description( "force emulation of unknown vm handlers...\n" );
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parser.add_argument()
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.name( "--emuall" )
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.description( "scan for all vm enters and trace all of them... this may take a few minutes..." );
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parser.add_argument()
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.name( "--locateconst" )
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.description( "scan all vm enters for a specific constant value...\n" );
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parser.enable_help();
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auto result = parser.parse( argc, argv );
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if ( result )
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{
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std::printf( "[!] error parsing commandline arguments... reason = %s\n", result.what().c_str() );
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return -1;
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}
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if ( parser.exists( "help" ) )
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{
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parser.print_help();
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return 0;
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}
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#include "unpacker.hpp"
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#include "vmemu_t.hpp"
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auto umtils = xtils::um_t::get_instance();
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vm::g_force_emu = parser.exists( "force" );
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int __cdecl main(int argc, const char *argv[]) {
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argparse::argument_parser_t parser("VMEmu",
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"VMProtect 2 VM Handler Emulator");
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parser.add_argument()
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.name("--vmentry")
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.description("relative virtual address to a vm entry...");
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parser.add_argument()
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.name("--bin")
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.description("path to unpacked virtualized binary...")
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.required(true);
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parser.add_argument()
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.name("--out")
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.description("output file name...")
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.required(true);
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parser.add_argument().name("--unpack").description("unpack a vmp2 binary...");
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parser.add_argument()
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.names({"-f", "--force"})
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.description("force emulation of unknown vm handlers...");
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parser.add_argument()
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.name("--emuall")
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.description(
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"scan for all vm enters and trace all of them... this may take a few "
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"minutes...");
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parser.enable_help();
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auto result = parser.parse(argc, argv);
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if (result) {
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std::printf("[!] error parsing commandline arguments... reason = %s\n",
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result.what().c_str());
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return -1;
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}
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if (parser.exists("help")) {
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parser.print_help();
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return 0;
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}
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vm::util::init();
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vm::g_force_emu = parser.exists("force");
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std::vector<std::uint8_t> module_data, tmp, unpacked_bin;
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if (!vm::util::open_binary_file(parser.get<std::string>("bin"),
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module_data)) {
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std::printf("[!] failed to open binary file...\n");
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return -1;
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}
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auto img = reinterpret_cast<win::image_t<> *>(module_data.data());
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auto image_size = img->get_nt_headers()->optional_header.size_image;
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const auto image_base = img->get_nt_headers()->optional_header.image_base;
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// page align the vector allocation so that unicorn-engine is happy girl...
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tmp.resize(image_size + PAGE_4KB);
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const std::uintptr_t module_base =
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reinterpret_cast<std::uintptr_t>(tmp.data()) +
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(PAGE_4KB - (reinterpret_cast<std::uintptr_t>(tmp.data()) & 0xFFFull));
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std::memcpy((void *)module_base, module_data.data(), 0x1000);
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std::for_each(img->get_nt_headers()->get_sections(),
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img->get_nt_headers()->get_sections() +
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img->get_nt_headers()->file_header.num_sections,
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[&](const auto §ion_header) {
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std::memcpy(
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(void *)(module_base + section_header.virtual_address),
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module_data.data() + section_header.ptr_raw_data,
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section_header.size_raw_data);
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});
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auto win_img = reinterpret_cast<win::image_t<> *>(module_base);
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auto basereloc_dir =
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win_img->get_directory(win::directory_id::directory_entry_basereloc);
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auto reloc_dir = reinterpret_cast<win::reloc_directory_t *>(
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basereloc_dir->rva + module_base);
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win::reloc_block_t *reloc_block = &reloc_dir->first_block;
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// apply relocations to all sections...
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while (reloc_block->base_rva && reloc_block->size_block) {
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std::for_each(reloc_block->begin(), reloc_block->end(),
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[&](win::reloc_entry_t &entry) {
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switch (entry.type) {
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case win::reloc_type_id::rel_based_dir64: {
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auto reloc_at = reinterpret_cast<std::uintptr_t *>(
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entry.offset + reloc_block->base_rva + module_base);
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*reloc_at = module_base + ((*reloc_at) - image_base);
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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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if ( !parser.exists( "unpack" ) && parser.exists( "vmentry" ) && parser.exists( "bin" ) && parser.exists( "out" ) )
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{
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const auto module_base = reinterpret_cast< std::uintptr_t >(
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LoadLibraryExA( parser.get< std::string >( "bin" ).c_str(), NULL, DONT_RESOLVE_DLL_REFERENCES ) );
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reloc_block = reloc_block->next();
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}
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if ( !module_base )
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{
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std::printf( "[!] failed to open binary file...\n" );
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return -1;
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}
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std::printf("> image base = %p, image size = %p, module base = %p\n",
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image_base, image_size, module_base);
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const auto vm_entry_rva = std::strtoull( parser.get< std::string >( "vmentry" ).c_str(), nullptr, 16 );
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const auto image_base = umtils->image_base( parser.get< std::string >( "bin" ).c_str() );
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const auto image_size = NT_HEADER( module_base )->OptionalHeader.SizeOfImage;
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if (!image_base || !image_size || !module_base) {
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std::printf("[!] failed to open binary on disk...\n");
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return -1;
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}
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std::printf( "> image base = %p, image size = %p, module base = %p\n", image_base, image_size, module_base );
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if (parser.exists("vmentry")) {
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const auto vm_entry_rva =
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std::strtoull(parser.get<std::string>("vmentry").c_str(), nullptr, 16);
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if ( !image_base || !image_size || !module_base )
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{
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std::printf( "[!] failed to open binary on disk...\n" );
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return -1;
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}
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std::vector<vm::instrs::code_block_t> code_blocks;
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vm::ctx_t vmctx(module_base, image_base, image_size, vm_entry_rva);
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std::vector< vm::instrs::code_block_t > code_blocks;
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vm::ctx_t vmctx( module_base, image_base, image_size, vm_entry_rva );
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if (!vmctx.init()) {
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std::printf(
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"[!] failed to init vmctx... this can be for many reasons..."
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" try validating your vm entry rva... make sure the binary is "
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"unpacked and is"
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"protected with VMProtect 2...\n");
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return -1;
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}
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if ( !vmctx.init() )
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{
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std::printf( "[!] failed to init vmctx... this can be for many reasons..."
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" try validating your vm entry rva... make sure the binary is unpacked and is"
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"protected with VMProtect 2...\n" );
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return -1;
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}
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vm::emu_t emu(&vmctx);
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vm::emu_t emu( &vmctx );
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if (!emu.init()) {
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std::printf("[!] failed to init emulator...\n");
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return -1;
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}
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if ( !emu.init() )
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{
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std::printf( "[!] failed to init emulator...\n" );
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return -1;
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}
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if (!emu.get_trace(code_blocks)) {
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std::printf(
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"[!] something failed during tracing, review the console for more "
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"information...\n");
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return -1;
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}
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if ( !emu.get_trace( code_blocks ) )
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{
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std::printf( "[!] something failed during tracing, review the console for more information...\n" );
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return -1;
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std::printf("> number of blocks = %d\n", code_blocks.size());
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for (auto &code_block : code_blocks) {
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std::printf("> code block starts at = %p\n", code_block.vip_begin);
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std::printf("> number of virtual instructions = %d\n",
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code_block.vinstrs.size());
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std::printf("> does this code block have a jcc? %s\n",
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code_block.jcc.has_jcc ? "yes" : "no");
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if (code_block.jcc.has_jcc) {
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switch (code_block.jcc.type) {
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case vm::instrs::jcc_type::branching: {
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std::printf("> branch 1 = %p, branch 2 = %p\n",
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code_block.jcc.block_addr[0],
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code_block.jcc.block_addr[1]);
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break;
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}
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case vm::instrs::jcc_type::absolute: {
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std::printf("> branch 1 = %p\n", code_block.jcc.block_addr[0]);
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break;
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}
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case vm::instrs::jcc_type::switch_case: {
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std::printf("> switch case blocks:\n");
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for (auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx)
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std::printf(" case block at = 0x%p\n",
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code_block.jcc.block_addr[idx]);
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break;
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}
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}
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}
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}
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std::printf( "> number of blocks = %d\n", code_blocks.size() );
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for ( auto &code_block : code_blocks )
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{
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std::printf( "> code block starts at = %p\n", code_block.vip_begin );
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std::printf( "> number of virtual instructions = %d\n", code_block.vinstrs.size() );
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std::printf( "> does this code block have a jcc? %s\n", code_block.jcc.has_jcc ? "yes" : "no" );
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if ( code_block.jcc.has_jcc )
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{
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switch ( code_block.jcc.type )
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{
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case vm::instrs::jcc_type::branching:
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{
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std::printf( "> branch 1 = %p, branch 2 = %p\n", code_block.jcc.block_addr[ 0 ],
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code_block.jcc.block_addr[ 1 ] );
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break;
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}
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case vm::instrs::jcc_type::absolute:
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{
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std::printf( "> branch 1 = %p\n", code_block.jcc.block_addr[ 0 ] );
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break;
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}
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case vm::instrs::jcc_type::switch_case:
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{
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std::printf( "> switch case blocks:\n" );
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for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
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std::printf( " case block at = 0x%p\n", code_block.jcc.block_addr[ idx ] );
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break;
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}
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}
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}
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}
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std::printf("> serializing results....\n");
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vmp2::v4::file_header file_header;
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file_header.magic = VMP_MAGIC;
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file_header.epoch_time = std::time(nullptr);
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file_header.version = vmp2::version_t::v4;
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file_header.module_base = module_base;
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file_header.image_base = image_base;
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file_header.vm_entry_rva = vm_entry_rva;
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file_header.module_offset = sizeof file_header;
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file_header.module_size = image_size;
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file_header.rtn_count = 1;
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file_header.rtn_offset = image_size + sizeof file_header;
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vmp2::v4::rtn_t rtn;
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std::ofstream output(parser.get<std::string>("out"), std::ios::binary);
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output.write(reinterpret_cast<const char *>(&file_header),
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sizeof file_header);
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output.write(reinterpret_cast<const char *>(module_base), image_size);
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std::vector<vmp2::v4::code_block_t *> vmp2_blocks;
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for (const auto &code_block : code_blocks) {
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const auto _code_block_size =
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sizeof(vmp2::v4::code_block_t) +
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(code_block.jcc.block_addr.size() * 8) +
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code_block.vinstrs.size() * sizeof(vm::instrs::virt_instr_t);
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vmp2::v4::code_block_t *_code_block =
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reinterpret_cast<vmp2::v4::code_block_t *>(malloc(_code_block_size));
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// serialize block meta data...
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_code_block->vip_begin = code_block.vip_begin;
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_code_block->next_block_offset = _code_block_size;
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_code_block->vinstr_count = code_block.vinstrs.size();
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_code_block->has_jcc = code_block.jcc.has_jcc;
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_code_block->jcc_type = code_block.jcc.type;
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_code_block->num_block_addrs = code_block.jcc.block_addr.size();
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// serialize jcc branches...
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for (auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx)
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_code_block->branch_addr[idx] = code_block.jcc.block_addr[idx];
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auto block_vinstrs = reinterpret_cast<vm::instrs::virt_instr_t *>(
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reinterpret_cast<std::uintptr_t>(_code_block) +
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sizeof(vmp2::v4::code_block_t) +
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(code_block.jcc.block_addr.size() * 8));
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for (auto idx = 0u; idx < code_block.vinstrs.size(); ++idx)
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block_vinstrs[idx] = code_block.vinstrs[idx];
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vmp2_blocks.push_back(_code_block);
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}
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std::printf( "> serializing results....\n" );
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vmp2::v4::file_header file_header;
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file_header.magic = VMP_MAGIC;
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file_header.epoch_time = std::time( nullptr );
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file_header.version = vmp2::version_t::v4;
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file_header.module_base = module_base;
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file_header.image_base = image_base;
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file_header.vm_entry_rva = vm_entry_rva;
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file_header.module_offset = sizeof file_header;
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file_header.module_size = image_size;
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file_header.rtn_count = 1;
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file_header.rtn_offset = image_size + sizeof file_header;
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vmp2::v4::rtn_t rtn;
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std::ofstream output( parser.get< std::string >( "out" ), std::ios::binary );
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output.write( reinterpret_cast< const char * >( &file_header ), sizeof file_header );
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output.write( reinterpret_cast< const char * >( module_base ), image_size );
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std::vector< vmp2::v4::code_block_t * > vmp2_blocks;
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for ( const auto &code_block : code_blocks )
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{
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const auto _code_block_size = sizeof vmp2::v4::code_block_t + ( code_block.jcc.block_addr.size() * 8 ) +
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code_block.vinstrs.size() * sizeof vm::instrs::virt_instr_t;
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vmp2::v4::code_block_t *_code_block =
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reinterpret_cast< vmp2::v4::code_block_t * >( malloc( _code_block_size ) );
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// serialize block meta data...
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_code_block->vip_begin = code_block.vip_begin;
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_code_block->next_block_offset = _code_block_size;
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_code_block->vinstr_count = code_block.vinstrs.size();
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_code_block->has_jcc = code_block.jcc.has_jcc;
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_code_block->jcc_type = code_block.jcc.type;
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_code_block->num_block_addrs = code_block.jcc.block_addr.size();
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// serialize jcc branches...
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for ( auto idx = 0u; idx < code_block.jcc.block_addr.size(); ++idx )
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_code_block->branch_addr[ idx ] = code_block.jcc.block_addr[ idx ];
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auto block_vinstrs = reinterpret_cast< vm::instrs::virt_instr_t * >(
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reinterpret_cast< std::uintptr_t >( _code_block ) + sizeof vmp2::v4::code_block_t +
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( code_block.jcc.block_addr.size() * 8 ) );
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for ( auto idx = 0u; idx < code_block.vinstrs.size(); ++idx )
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block_vinstrs[ idx ] = code_block.vinstrs[ idx ];
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vmp2_blocks.push_back( _code_block );
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}
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std::size_t code_blocks_size = sizeof(vmp2::v4::rtn_t::size) +
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sizeof(vmp2::v4::rtn_t::code_block_count) +
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sizeof(vmp2::v4::rtn_t::vm_enter_offset);
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std::for_each(vmp2_blocks.begin(), vmp2_blocks.end(),
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[&](vmp2::v4::code_block_t *vmp2_block) -> void {
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code_blocks_size += vmp2_block->next_block_offset;
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});
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rtn.size = code_blocks_size;
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rtn.code_block_count = vmp2_blocks.size();
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rtn.vm_enter_offset = vm_entry_rva;
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output.write(reinterpret_cast<const char *>(&rtn),
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sizeof(vmp2::v4::rtn_t::size) +
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sizeof(vmp2::v4::rtn_t::code_block_count) +
|
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sizeof(vmp2::v4::rtn_t::vm_enter_offset));
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|
||||
std::for_each(vmp2_blocks.begin(), vmp2_blocks.end(),
|
||||
[&](vmp2::v4::code_block_t *vmp2_block) -> void {
|
||||
output.write(reinterpret_cast<const char *>(vmp2_block),
|
||||
vmp2_block->next_block_offset);
|
||||
free(vmp2_block);
|
||||
});
|
||||
output.close();
|
||||
} else if (parser.exists("unpack")) {
|
||||
engine::unpack_t unpacker(parser.get<std::string>("bin"), module_data);
|
||||
|
||||
if (!unpacker.init()) {
|
||||
std::printf("> failed to init unpacker...\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
std::size_t code_blocks_size = sizeof( vmp2::v4::rtn_t::size ) + sizeof( vmp2::v4::rtn_t::code_block_count ) +
|
||||
sizeof( vmp2::v4::rtn_t::vm_enter_offset );
|
||||
if (!unpacker.unpack(unpacked_bin)) {
|
||||
std::printf("> failed to unpack binary... refer to log above...\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
std::for_each( vmp2_blocks.begin(), vmp2_blocks.end(), [ & ]( vmp2::v4::code_block_t *vmp2_block ) -> void {
|
||||
code_blocks_size += vmp2_block->next_block_offset;
|
||||
} );
|
||||
std::printf("> writing result to = %s\n",
|
||||
parser.get<std::string>("out").c_str());
|
||||
|
||||
rtn.size = code_blocks_size;
|
||||
rtn.code_block_count = vmp2_blocks.size();
|
||||
rtn.vm_enter_offset = vm_entry_rva;
|
||||
std::ofstream output(parser.get<std::string>("out"), std::ios::binary);
|
||||
output.write(reinterpret_cast<char *>(unpacked_bin.data()),
|
||||
unpacked_bin.size());
|
||||
|
||||
output.write( reinterpret_cast< const char * >( &rtn ), sizeof( vmp2::v4::rtn_t::size ) +
|
||||
sizeof( vmp2::v4::rtn_t::code_block_count ) +
|
||||
sizeof( vmp2::v4::rtn_t::vm_enter_offset ) );
|
||||
output.close();
|
||||
} else if (parser.exists("emuall")) {
|
||||
auto entries = vm::locate::get_vm_entries(module_base, image_size);
|
||||
|
||||
std::for_each( vmp2_blocks.begin(), vmp2_blocks.end(), [ & ]( vmp2::v4::code_block_t *vmp2_block ) -> void {
|
||||
output.write( reinterpret_cast< const char * >( vmp2_block ), vmp2_block->next_block_offset );
|
||||
free( vmp2_block );
|
||||
} );
|
||||
output.close();
|
||||
}
|
||||
else if ( parser.exists( "unpack" ) && parser.exists( "out" ) )
|
||||
{
|
||||
std::vector< std::uint8_t > packed_bin, unpacked_bin;
|
||||
if ( !umtils->open_binary_file( parser.get< std::string >( "unpack" ), packed_bin ) )
|
||||
{
|
||||
std::printf( "> failed to read bin off disk...\n" );
|
||||
return -1;
|
||||
}
|
||||
std::vector<
|
||||
std::pair<std::uintptr_t, std::vector<vm::instrs::code_block_t> > >
|
||||
virt_rtns;
|
||||
|
||||
engine::unpack_t unpacker( packed_bin );
|
||||
for (const auto &[vm_enter_offset, encrypted_rva, hndlr_tble] : entries) {
|
||||
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 ( !unpacker.init() )
|
||||
{
|
||||
std::printf( "> failed to init unpacker...\n" );
|
||||
return -1;
|
||||
}
|
||||
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;
|
||||
}
|
||||
|
||||
if ( !unpacker.unpack( unpacked_bin ) )
|
||||
{
|
||||
std::printf( "> failed to unpack binary... refer to log above...\n" );
|
||||
return -1;
|
||||
}
|
||||
vm::emu_t emu(&vm_ctx);
|
||||
|
||||
std::printf( "> writing result to = %s\n", parser.get< std::string >( "out" ).c_str() );
|
||||
std::ofstream output( parser.get< std::string >( "out" ), std::ios::binary );
|
||||
output.write( reinterpret_cast< char * >( unpacked_bin.data() ), unpacked_bin.size() );
|
||||
output.close();
|
||||
}
|
||||
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 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::vector< std::pair< std::uintptr_t, std::vector< vm::instrs::code_block_t > > > virt_rtns;
|
||||
for ( const auto &[ vm_enter_offset, encrypted_rva ] : vm_enters )
|
||||
{
|
||||
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( { vm_enter_offset, code_blocks } );
|
||||
}
|
||||
if (!emu.init()) {
|
||||
std::printf("[!] failed to init emulator...\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
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 &[ vm_enter_offset, virt_rtn ] : virt_rtns )
|
||||
{
|
||||
vmp2::v4::rtn_t rtn{ virt_rtn.size() };
|
||||
std::vector< vmp2::v4::code_block_t * > vmp2_blocks;
|
||||
|
||||
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 ];
|
||||
|
||||
vmp2_blocks.push_back( _code_block );
|
||||
}
|
||||
|
||||
std::size_t code_blocks_size = sizeof( vmp2::v4::rtn_t::size ) +
|
||||
sizeof( vmp2::v4::rtn_t::vm_enter_offset ) +
|
||||
sizeof( vmp2::v4::rtn_t::code_block_count );
|
||||
|
||||
std::for_each( vmp2_blocks.begin(), vmp2_blocks.end(), [ & ]( vmp2::v4::code_block_t *vmp2_block ) -> void {
|
||||
code_blocks_size += vmp2_block->next_block_offset;
|
||||
} );
|
||||
|
||||
rtn.size = code_blocks_size;
|
||||
rtn.code_block_count = vmp2_blocks.size();
|
||||
rtn.vm_enter_offset = vm_enter_offset;
|
||||
|
||||
output.write( reinterpret_cast< const char * >( &rtn ), sizeof( vmp2::v4::rtn_t::size ) +
|
||||
sizeof( vmp2::v4::rtn_t::code_block_count ) +
|
||||
sizeof( vmp2::v4::rtn_t::vm_enter_offset ) );
|
||||
|
||||
std::for_each( vmp2_blocks.begin(), vmp2_blocks.end(), [ & ]( vmp2::v4::code_block_t *vmp2_block ) -> void {
|
||||
output.write( reinterpret_cast< const char * >( vmp2_block ), vmp2_block->next_block_offset );
|
||||
free( vmp2_block );
|
||||
} );
|
||||
}
|
||||
output.close();
|
||||
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({vm_enter_offset, code_blocks});
|
||||
}
|
||||
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 );
|
||||
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" );
|
||||
return -1;
|
||||
}
|
||||
|
||||
std::printf( "> number of blocks = %d\n", code_blocks.size() );
|
||||
|
||||
for ( auto &code_block : code_blocks )
|
||||
{
|
||||
for ( const auto &vinstr : code_block.vinstrs )
|
||||
{
|
||||
if ( vinstr.operand.has_imm && vinstr.operand.imm.u == const_val )
|
||||
{
|
||||
std::printf( "> found constant in vm enter at = 0x%x\n", vm_enter_offset );
|
||||
std::getchar();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
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 &[vm_enter_offset, virt_rtn] : virt_rtns) {
|
||||
vmp2::v4::rtn_t rtn{(u32)virt_rtn.size()};
|
||||
std::vector<vmp2::v4::code_block_t *> vmp2_blocks;
|
||||
|
||||
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];
|
||||
|
||||
vmp2_blocks.push_back(_code_block);
|
||||
}
|
||||
|
||||
std::size_t code_blocks_size = sizeof(vmp2::v4::rtn_t::size) +
|
||||
sizeof(vmp2::v4::rtn_t::vm_enter_offset) +
|
||||
sizeof(vmp2::v4::rtn_t::code_block_count);
|
||||
|
||||
std::for_each(vmp2_blocks.begin(), vmp2_blocks.end(),
|
||||
[&](vmp2::v4::code_block_t *vmp2_block) -> void {
|
||||
code_blocks_size += vmp2_block->next_block_offset;
|
||||
});
|
||||
|
||||
rtn.size = code_blocks_size;
|
||||
rtn.code_block_count = vmp2_blocks.size();
|
||||
rtn.vm_enter_offset = vm_enter_offset;
|
||||
|
||||
output.write(reinterpret_cast<const char *>(&rtn),
|
||||
sizeof(vmp2::v4::rtn_t::size) +
|
||||
sizeof(vmp2::v4::rtn_t::code_block_count) +
|
||||
sizeof(vmp2::v4::rtn_t::vm_enter_offset));
|
||||
|
||||
std::for_each(vmp2_blocks.begin(), vmp2_blocks.end(),
|
||||
[&](vmp2::v4::code_block_t *vmp2_block) -> void {
|
||||
output.write(reinterpret_cast<const char *>(vmp2_block),
|
||||
vmp2_block->next_block_offset);
|
||||
free(vmp2_block);
|
||||
});
|
||||
}
|
||||
output.close();
|
||||
}
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
Loading…
Reference in new issue