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vmemu
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updated vmprofiler, still defining vmprofiles and such...

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main
John Doe 2 years ago
parent 99f00be5d3
commit 865bb1563c
4 changed files with 32 additions and 37 deletions
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2
deps/vmprofiler vendored

@ -1 +1 @@
Subproject commit eb91191526dc63f9c972ad7d9c1f03be36dc2e51
Subproject commit b560b35284d43a211c67b66d852c950649058b80

10
include/vmemu_t.hpp
Unescape View File

@ -12,10 +12,7 @@
namespace vm {
class emu_t {
public:
explicit emu_t(
vm::vmctx_t* vm_ctx,
std::map<std::uint32_t, vm::instrs::profiler_t*>* known_hndlrs);
explicit emu_t(vm::vmctx_t* vm_ctx);
~emu_t();
bool init();
void emulate();
@ -24,16 +21,15 @@ class emu_t {
uc_engine* uc;
const vm::vmctx_t* m_vm;
zydis_reg_t vip, vsp;
std::map<std::uint32_t, vm::instrs::profiler_t*>* m_known_hndlrs;
std::unique_ptr<vm::instrs::hndlr_trace_t> cc_trace;
vm::instrs::hndlr_trace_t cc_trace;
uc_hook code_exec_hook, invalid_mem_hook, int_hook;
static void int_callback(uc_engine* uc, std::uint32_t intno, emu_t* obj);
static bool code_exec_callback(uc_engine* uc,
uint64_t address,
uint32_t size,
emu_t* obj);
static void int_callback(uc_engine* uc, std::uint32_t intno, emu_t* obj);
static void invalid_mem(uc_engine* uc,
uc_mem_type type,
uint64_t address,

4
src/main.cpp
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@ -125,9 +125,7 @@ int __cdecl main(int argc, const char* argv[]) {
return -1;
}
std::map<std::uint32_t, vm::instrs::profiler_t*> known_hndlrs;
vm::emu_t emu(&vmctx, &known_hndlrs);
vm::emu_t emu(&vmctx);
if (!emu.init()) {
std::printf(
"[!] failed to init vm::emu_t... read above in the console for the "

49
src/vmemu_t.cpp
Unescape View File

@ -1,13 +1,8 @@
#include <vmemu_t.hpp>
namespace vm {
emu_t::emu_t(vm::vmctx_t* vm_ctx,
std::map<std::uint32_t, vm::instrs::profiler_t*>* known_hndlrs)
: m_vm(vm_ctx),
vip(vm_ctx->get_vip()),
vsp(vm_ctx->get_vsp()),
cc_trace(nullptr),
m_known_hndlrs(known_hndlrs) {}
emu_t::emu_t(vm::vmctx_t* vm_ctx)
: m_vm(vm_ctx), vip(vm_ctx->get_vip()), vsp(vm_ctx->get_vsp()) {}
emu_t::~emu_t() {
if (uc)
@ -79,9 +74,9 @@ void emu_t::emulate() {
return;
}
cc_trace = std::make_unique<vm::instrs::hndlr_trace_t>();
cc_trace->m_vip = vip;
cc_trace->m_vsp = vsp;
cc_trace.m_uc = uc;
cc_trace.m_vip = vip;
cc_trace.m_vsp = vsp;
std::printf("> beginning execution at = %p\n", rip);
if ((err = uc_emu_start(uc, rip, 0ull, 0ull, 0ull))) {
@ -146,8 +141,10 @@ bool emu_t::code_exec_callback(uc_engine* uc,
// profiles to grab decrypted values and such...
uc_context* cpu_ctx;
uc_context_alloc(obj->uc, &cpu_ctx);
uc_context_save(obj->uc, cpu_ctx);
vm::instrs::emu_instr_t emu_instr{instr, cpu_ctx};
obj->cc_trace->m_instrs.push_back(emu_instr);
obj->cc_trace.m_instrs.push_back(emu_instr);
// RET or JMP REG means the end of a vm handler...
if (instr.mnemonic == ZYDIS_MNEMONIC_RET ||
@ -155,12 +152,12 @@ bool emu_t::code_exec_callback(uc_engine* uc,
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER)) {
// deobfuscate the instruction stream before profiling...
// makes it easier for profiles to be correct...
vm::instrs::deobfuscate(*obj->cc_trace);
vm::instrs::deobfuscate(obj->cc_trace);
// find the last MOV REG, DWORD PTR [VIP] in the instruction stream, then
// remove any instructions from this instruction to the JMP/RET...
const auto rva_fetch = std::find_if(
obj->cc_trace->m_instrs.rbegin(), obj->cc_trace->m_instrs.rend(),
obj->cc_trace.m_instrs.rbegin(), obj->cc_trace.m_instrs.rend(),
[&vip = obj->vip](const vm::instrs::emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return i.mnemonic == ZYDIS_MNEMONIC_MOV &&
@ -169,17 +166,17 @@ bool emu_t::code_exec_callback(uc_engine* uc,
i.operands[1].mem.base == vip && i.operands[1].size == 32;
});
if (rva_fetch != obj->cc_trace->m_instrs.rend())
obj->cc_trace->m_instrs.erase((rva_fetch + 1).base(),
obj->cc_trace->m_instrs.end());
if (rva_fetch != obj->cc_trace.m_instrs.rend())
obj->cc_trace.m_instrs.erase((rva_fetch + 1).base(),
obj->cc_trace.m_instrs.end());
const auto vinstr =
vm::instrs::determine(obj->vip, obj->vsp, *obj->cc_trace);
vm::instrs::determine(obj->vip, obj->vsp, obj->cc_trace);
if (vinstr.mnemonic == vm::instrs::mnemonic_t::unknown) {
zydis_rtn_t inst_stream;
std::for_each(obj->cc_trace->m_instrs.begin(),
obj->cc_trace->m_instrs.end(),
std::for_each(obj->cc_trace.m_instrs.begin(),
obj->cc_trace.m_instrs.end(),
[&](vm::instrs::emu_instr_t& instr) {
inst_stream.push_back({instr.m_instr});
});
@ -188,23 +185,27 @@ bool emu_t::code_exec_callback(uc_engine* uc,
std::printf("========\n");
std::getchar();
} else {
if (vinstr.imm.has_imm)
std::printf("> %s %p\n",
vm::instrs::get_profile(vinstr.mnemonic)->name.c_str(),
vinstr.imm.val);
else
std::printf("> %s\n",
vm::instrs::get_profile(vinstr.mnemonic)->name.c_str());
}
if (vinstr.mnemonic == vm::instrs::mnemonic_t::jmp) {
obj->cc_trace->m_vip = obj->vip;
obj->cc_trace->m_vsp = obj->vsp;
obj->cc_trace.m_vip = obj->vip;
obj->cc_trace.m_vsp = obj->vsp;
}
// free the trace since we will start a new one...
std::for_each(obj->cc_trace->m_instrs.begin(),
obj->cc_trace->m_instrs.end(),
std::for_each(obj->cc_trace.m_instrs.begin(), obj->cc_trace.m_instrs.end(),
[&](const vm::instrs::emu_instr_t& instr) {
uc_context_free(instr.m_cpu);
});
obj->cc_trace->m_instrs.clear();
obj->cc_trace.m_instrs.clear();
}
return true;
}

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