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@ -1,5 +1,8 @@
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#include <string>
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#include <vmemu_t.hpp>
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#include <unordered_set>
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int g_new_delete_tracker;
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namespace vm {
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emu_t::emu_t(vm::vmctx_t* vm_ctx) : m_vm(vm_ctx) {};
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@ -58,6 +61,8 @@ bool emu_t::init() {
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}
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bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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std::printf("\nSTARTING FROM NEW VMENTER AT %p (%p)\n\n", vmenter_rva + m_vm->m_module_base,
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vmenter_rva + m_vm->m_image_base);
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uc_err err;
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vrtn.m_rva = vmenter_rva;
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@ -83,6 +88,8 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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}
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std::printf("> beginning execution at = %p (%p)\n", rip, rip - m_vm->m_module_base + m_vm->m_image_base);
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std::printf("vsp: %s, vip: %s\n", ZydisRegisterGetString(cc_blk->m_vm.vsp),
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ZydisRegisterGetString(cc_blk->m_vm.vip));
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if ((err = uc_emu_start(uc, rip, 0ull, 0ull, 0ull))) {
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std::printf("> error starting emu... reason = %d\n", err);
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return false;
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@ -92,8 +99,8 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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std::printf("> emulated blk_%p\n\n", cc_blk->m_vip.img_based);
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// keep track of the emulated blocks... by their addresses...
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std::vector<std::uintptr_t> blk_addrs;
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blk_addrs.push_back(blk.m_vip.rva + m_vm->m_module_base);
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std::unordered_set<std::uintptr_t> blk_addrs;
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blk_addrs.insert(blk.m_vip.rva + m_vm->m_module_base);
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// the vector containing the vblk's grows inside of this for loop
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// thus we cannot use an advanced for loop (which uses itr's)...
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@ -103,8 +110,7 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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// force the emulation of all branches...
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for (const auto br : blk.branches) {
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// only emulate blocks that havent been emulated before...
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if (std::find(blk_addrs.begin(), blk_addrs.end(), br) !=
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blk_addrs.end())
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if (blk_addrs.find(br) != blk_addrs.end())
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continue;
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std::uintptr_t vsp = 0ull;
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@ -119,9 +125,12 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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cc_blk = &new_blk;
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// emulate the branch...
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// The stack is now set up with vsp pointing to the next branch to execute, therefore the jmp will go to that branch.
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uc_mem_write(uc, vsp, &br, sizeof br);
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std::printf("> beginning execution at = %p (%p)\n", blk.m_jmp.rip,
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blk.m_jmp.rip - m_vm->m_module_base + m_vm->m_image_base);
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std::printf("vsp: %s, vip: %s\n", ZydisRegisterGetString(cc_blk->m_vm.vsp),
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ZydisRegisterGetString(cc_blk->m_vm.vip));
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if ((err = uc_emu_start(uc, blk.m_jmp.rip, 0ull, 0ull, 0ull))) {
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std::printf("> error starting emu... reason = %d\n", err);
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return false;
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@ -129,6 +138,8 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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extract_branch_data();
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std::printf("> emulated blk_%p\n", cc_blk->m_vip.img_based);
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// We needn't execute a block more than once for a single vrtn.
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blk_addrs.insert(br);
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}
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}
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}
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@ -138,7 +149,7 @@ bool emu_t::emulate(std::uint32_t vmenter_rva, vm::instrs::vrtn_t& vrtn) {
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[&](vm::instrs::vblk_t& blk) {
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if (blk.m_jmp.ctx) uct_context_free(blk.m_jmp.ctx);
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if (blk.m_jmp.stack) delete[] blk.m_jmp.stack;
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if (blk.m_jmp.stack) delete[] blk.m_jmp.stack; if (blk.m_jmp.stack) g_new_delete_tracker--;
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});
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return true;
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@ -200,6 +211,7 @@ void emu_t::extract_branch_data() {
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vm::utils::scn::executable(m_vm->m_module_base, imm_mod_based)) {
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cc_blk->branches.push_back(imm_mod_based);
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cc_blk->branch_type = vm::instrs::vbranch_type::absolute;
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std::printf("> absolute virtual jmp uncovered... branch = %p\n", imm_mod_based);
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}
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} else {
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std::printf("> jump table detected... review instruction stream...\n");
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@ -264,7 +276,7 @@ bool emu_t::branch_pred_spec_exec(uc_engine* uc, uint64_t address,
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if (!obj->cc_trace.m_instrs.size()) {
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obj->cc_trace.m_vip = obj->cc_blk->m_vm.vip;
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obj->cc_trace.m_vsp = obj->cc_blk->m_vm.vsp;
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obj->cc_trace.m_stack = new std::uint8_t[STACK_SIZE];
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obj->cc_trace.m_stack = new std::uint8_t[STACK_SIZE]; g_new_delete_tracker++;
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uc_mem_read(uc, STACK_BASE, obj->cc_trace.m_stack, STACK_SIZE);
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}
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@ -309,7 +321,7 @@ bool emu_t::branch_pred_spec_exec(uc_engine* uc, uint64_t address,
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uct_context_free(instr.m_cpu);
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});
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delete[] obj->cc_trace.m_stack;
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delete[] obj->cc_trace.m_stack; if (obj->cc_trace.m_stack) g_new_delete_tracker--;
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obj->cc_trace.m_instrs.clear();
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if (vinstr.mnemonic != vm::instrs::mnemonic_t::jmp) {
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@ -352,7 +364,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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if (!obj->cc_trace.m_instrs.size()) {
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obj->cc_trace.m_vip = obj->cc_blk->m_vm.vip;
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obj->cc_trace.m_vsp = obj->cc_blk->m_vm.vsp;
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obj->cc_trace.m_stack = new std::uint8_t[STACK_SIZE];
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obj->cc_trace.m_stack = new std::uint8_t[STACK_SIZE]; g_new_delete_tracker++;
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obj->cc_trace.m_begin = address;
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uc_mem_read(uc, STACK_BASE, obj->cc_trace.m_stack, STACK_SIZE);
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}
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@ -369,7 +381,9 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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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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// This may be more performant and elegant, but it fucks my new jmp profiler.
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// I will keep it in as a comment for now in case I can make a jmp profiler compatible with this.
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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->cc_trace.m_vip](
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const vm::instrs::emu_instr_t& instr) -> bool {
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@ -388,7 +402,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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}
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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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}
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} */
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// set the virtual code block vip address information...
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if (!obj->cc_blk->m_vip.rva || !obj->cc_blk->m_vip.img_based) {
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@ -418,6 +432,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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} else {
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const auto vinstr = vm::instrs::determine(obj->cc_trace);
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if (vinstr.mnemonic != vm::instrs::mnemonic_t::unknown) {
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if (s_log_instructions) {
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std::printf("%p: ", obj->cc_trace.m_begin + obj->m_vm->m_image_base - obj->m_vm->m_module_base);
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if (vinstr.imm.has_imm)
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if (vinstr.mnemonic == instrs::mnemonic_t::lreg || vinstr.mnemonic == instrs::mnemonic_t::sreg)
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@ -432,6 +447,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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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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}
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} else {
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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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@ -444,8 +460,6 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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"> err: please define the following vm handler (at = %p):\n",
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(obj->cc_trace.m_begin - obj->m_vm->m_module_base) +
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obj->m_vm->m_image_base);
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std::printf("vsp: %s, vip: %s\n", ZydisRegisterGetString(obj->cc_trace.m_vsp),
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ZydisRegisterGetString(obj->cc_trace.m_vip));
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vm::utils::print(inst_stream);
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uc_emu_stop(uc);
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return false;
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@ -471,7 +485,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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// set current code block virtual jmp instruction information...
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obj->cc_blk->m_jmp.ctx = copy;
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obj->cc_blk->m_jmp.rip = obj->cc_trace.m_begin;
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obj->cc_blk->m_jmp.stack = new std::uint8_t[STACK_SIZE];
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obj->cc_blk->m_jmp.stack = new std::uint8_t[STACK_SIZE]; g_new_delete_tracker++;
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obj->cc_blk->m_jmp.m_vm = {obj->cc_trace.m_vip, obj->cc_trace.m_vsp};
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std::memcpy(obj->cc_blk->m_jmp.stack, obj->cc_trace.m_stack,
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STACK_SIZE);
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@ -491,7 +505,7 @@ bool emu_t::code_exec_callback(uc_engine* uc, uint64_t address, uint32_t size,
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uct_context_free(instr.m_cpu);
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});
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delete[] obj->cc_trace.m_stack;
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delete[] obj->cc_trace.m_stack; if (obj->cc_trace.m_stack) g_new_delete_tracker--;
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obj->cc_trace.m_instrs.clear();
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}
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return true;
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@ -537,7 +551,7 @@ bool emu_t::legit_branch(vm::instrs::vblk_t& vblk, std::uintptr_t branch_addr) {
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uc_context* backup;
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uct_context_alloc(uc, &backup);
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uc_context_save(uc, backup);
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std::uint8_t* stack = new std::uint8_t[STACK_SIZE];
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std::uint8_t* stack = new std::uint8_t[STACK_SIZE]; g_new_delete_tracker++;
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uc_mem_read(uc, STACK_BASE, stack, STACK_SIZE);
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// restore cpu and stack back to the virtual jump handler...
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@ -557,7 +571,7 @@ bool emu_t::legit_branch(vm::instrs::vblk_t& vblk, std::uintptr_t branch_addr) {
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uc_mem_write(uc, STACK_BASE, stack, STACK_SIZE);
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uc_context_restore(uc, backup);
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uct_context_free(backup);
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delete[] stack;
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delete[] stack; if (stack) g_new_delete_tracker--;
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// add normal execution callback back...
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uc_hook_del(uc, branch_pred_hook);
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