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@ -141,21 +141,55 @@ bool emu_t::code_exec_callback(uc_engine* uc,
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if (instr.mnemonic == ZYDIS_MNEMONIC_INVALID)
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return false;
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// save the current cpu's context (all register values and such)...
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// create a new emu_instr_t with this information... this info will be used by
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// profiles to grab decrypted values and such...
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uc_context* cpu_ctx;
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uc_context_alloc(obj->uc, &cpu_ctx);
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vm::instrs::emu_instr_t emu_instr{instr, cpu_ctx};
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obj->cc_trace->m_instrs.push_back(emu_instr);
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// RET or JMP REG means the end of a vm handler...
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if (instr.mnemonic == ZYDIS_MNEMONIC_RET ||
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(instr.mnemonic == ZYDIS_MNEMONIC_JMP &&
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instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER)) {
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// deobfuscate the instruction stream before profiling...
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// makes it easier for profiles to be correct...
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vm::instrs::deobfuscate(*obj->cc_trace);
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// find the last MOV REG, DWORD PTR [VIP] in the instruction stream, then
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// remove any instructions from this instruction to the JMP/RET...
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const auto rva_fetch = std::find_if(
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obj->cc_trace->m_instrs.rbegin(), obj->cc_trace->m_instrs.rend(),
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[&vip = obj->vip](const vm::instrs::emu_instr_t& instr) -> bool {
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const auto& i = instr.m_instr;
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return i.mnemonic == ZYDIS_MNEMONIC_MOV &&
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i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
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i.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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i.operands[1].mem.base == vip && i.operands[1].size == 32;
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});
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if (rva_fetch != obj->cc_trace->m_instrs.rend())
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obj->cc_trace->m_instrs.erase((rva_fetch + 1).base(),
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obj->cc_trace->m_instrs.end());
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const auto vinstr =
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vm::instrs::determine(obj->vip, obj->vsp, *obj->cc_trace);
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if (vinstr.mnemonic != vm::instrs::mnemonic_t::unknown) {
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if (vinstr.mnemonic == vm::instrs::mnemonic_t::unknown) {
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zydis_rtn_t inst_stream;
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std::for_each(obj->cc_trace->m_instrs.begin(),
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obj->cc_trace->m_instrs.end(),
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[&](vm::instrs::emu_instr_t& instr) {
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inst_stream.push_back({instr.m_instr});
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});
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vm::utils::print(inst_stream);
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std::printf("========\n");
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std::getchar();
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} else {
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std::printf("> %s\n",
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vm::instrs::get_profile(vinstr.mnemonic)->name.c_str());
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std::getchar();
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}
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if (vinstr.mnemonic == vm::instrs::mnemonic_t::jmp) {
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