forked from vmp3/vmemu
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132 lines
4.5 KiB
132 lines
4.5 KiB
#include <cli-parser.hpp>
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#include <fstream>
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#include <iostream>
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#include <thread>
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#include "vmemu_t.hpp"
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#define NUM_THREADS 20
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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 3 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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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& section_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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reloc_block = reloc_block->next();
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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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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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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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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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vm::util::print(vmctx.vm_entry);
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}
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} |