Working integrity check bypass
This commit is contained in:
momo5502
parent
92312dcf2f
commit
7ea589d3b4
@ -438,7 +438,7 @@ namespace arxan
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void protect_texts()
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{
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if(ignore) return;
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if (ignore) return;
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const auto& texts = get_text_sections();
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for (const auto& text : texts)
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@ -521,58 +521,81 @@ namespace arxan
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}
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uint32_t adjust_integrity_checksum(const uint64_t return_address, uint8_t* stack_frame, bool type)
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uint32_t adjust_integrity_checksum(const uint64_t return_address, uint8_t* stack_frame, const uint32_t current_checksum)
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{
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if (type)
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uint32_t frame_offset = 0;
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const auto handler_address = return_address - 5;
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const auto handler = integrity_handlers.find(handler_address);
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if(handler != integrity_handlers.end())
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{
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OutputDebugStringA("Type1");
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frame_offset = handler->second.frame_offset;
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}
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else
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{
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OutputDebugStringA("Type2");
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}
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// MessageBoxA(0, "III", 0, 0);
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const auto handler_address = return_address - 5;
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const auto handler = integrity_handlers.at(handler_address);
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for(frame_offset = 0x38; frame_offset < 0x90; frame_offset += 8)
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{
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auto* potential_address = *reinterpret_cast<uint32_t**>(stack_frame + frame_offset);
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const auto* context = reinterpret_cast<integrity_handler_context*>(stack_frame + handler.frame_offset);
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int64_t diff = (uint64_t)stack_frame - (uint64_t)potential_address;
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diff = std::abs(diff);
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if(diff < 0x1000 && *potential_address == current_checksum)
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{
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break;
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}
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}
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if(frame_offset >= 0x90)
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{
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OutputDebugStringA(utils::string::va("Unable to find frame offset for: %llX", return_address));
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return current_checksum;
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}
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else
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{
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//OutputDebugStringA("Found frame for unknown handler");
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}
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}
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const auto* context = reinterpret_cast<integrity_handler_context*>(stack_frame + frame_offset);
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if (*context->computed_checksum != *context->original_checksum)
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{
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OutputDebugStringA("Patching checksum :3");
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OutputDebugStringA(utils::string::va("Adjusting checksum (%llX): %X -> %X", handler_address, *context->computed_checksum, *context->original_checksum));
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}
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else
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{
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OutputDebugStringA("Not patching");
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//OutputDebugStringA("Not patching");
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}
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*context->computed_checksum = *context->original_checksum;
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return *context->original_checksum;
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}
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void patch_integrity_check(const integrity_handler_data& handler)
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void patch_integrity_check(void* address)
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{
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OutputDebugStringA(utils::string::va("Patching: %llX", handler.address));
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//OutputDebugStringA(utils::string::va("Patching: %llX", address));
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const auto game_address = operator"" _g(handler.address);
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const auto game_address = (uint64_t)address;
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constexpr auto inst_len = 3; // mov [rdx+rcx*4], eax
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const auto next_inst_addr = game_address + inst_len;
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const auto next_inst = *reinterpret_cast<uint32_t*>(next_inst_addr);
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// Basicblock is intact
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// Basic block is intact
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if ((next_inst & 0xFF00FFFF) == 0xFF004583)
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{
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const uint8_t other_frame_offset = next_inst >> 16;
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static const auto stub = utils::hook::assemble([](utils::hook::assembler& a)
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{
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a.mov(rax, qword_ptr(rsp));
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a.push(rax);
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a.mov(rax, qword_ptr(rsp, 8));
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a.sub(rax, 2); // Skip the push we inserted
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a.push(rax);
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a.pushad64();
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a.mov(r8, 0);
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a.mov(r8, qword_ptr(rsp, 0x88));
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a.mov(rcx, rax);
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a.mov(rdx, rbp);
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a.call_aligned(adjust_integrity_checksum);
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@ -582,6 +605,8 @@ namespace arxan
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a.popad64();
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a.pop(rax);
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a.add(rsp, 8);
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a.mov(dword_ptr(rdx, rcx, 4), eax);
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a.pop(rax); // return addr
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@ -597,17 +622,20 @@ namespace arxan
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utils::hook::set<uint16_t>(game_address, 0x6A | (other_frame_offset << 8)); // push other_frame_offset
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utils::hook::call(game_address + 2, stub);
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}
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// Split basic blocks
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else if (*(uint8_t*)next_inst_addr == 0xE9)
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{
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const auto jump_target = utils::hook::extract<void*>(reinterpret_cast<void*>(next_inst_addr + 1));
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const auto stub = utils::hook::assemble([jump_target](utils::hook::assembler& a)
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{
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a.mov(rax, qword_ptr(rsp));
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a.push(rax);
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a.mov(rax, qword_ptr(rsp, 8));
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a.push(rax);
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a.pushad64();
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a.mov(r8, 1);
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a.mov(r8, qword_ptr(rsp, 0x88));
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a.mov(rcx, rax);
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a.mov(rdx, rbp);
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a.call_aligned(adjust_integrity_checksum);
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@ -617,6 +645,8 @@ namespace arxan
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a.popad64();
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a.pop(rax);
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a.add(rsp, 8);
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a.mov(dword_ptr(rdx, rcx, 4), eax);
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a.add(rsp, 8);
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@ -630,8 +660,6 @@ namespace arxan
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{
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OutputDebugStringA(utils::string::va("Unknown :( %llX", game_address));
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}
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OutputDebugStringA(utils::string::va("Patching done: %llX", handler.address));
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}
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void patch_integrity_checks()
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@ -642,7 +670,7 @@ namespace arxan
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for (const auto& handler : integrity_handlers)
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{
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patch_integrity_check(handler.second);
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patch_integrity_check((void*)handler.first);
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// break;
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}
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@ -650,6 +678,29 @@ namespace arxan
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//utils::thread::resume_other_threads();
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}
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void search_and_patch_integrity_checks()
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{
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OutputDebugStringA("Searching integrity handlers...");
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auto intact_results = "89 04 8A 83 45 ? FF"_sig;
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auto split_results = "89 04 8A E9"_sig;
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int count = 0;
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for(auto i : intact_results)
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{
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patch_integrity_check(i);
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++count;
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}
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for(auto i : split_results)
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{
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patch_integrity_check(i);
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++count;
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}
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OutputDebugStringA(utils::string::va("Patched %i integrity handlers!", count));
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}
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LONG WINAPI exception_filter(const LPEXCEPTION_POINTERS info)
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{
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static thread_local struct
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@ -1089,12 +1140,13 @@ namespace arxan
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MessageBoxA(0, "done", 0, 0);
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*/
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search_and_patch_integrity_checks();
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std::thread([]()
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/*std::thread([]()
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{
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MessageBoxA(0, 0, 0, 0);
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protect_texts();
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patch_integrity_checks();
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search_and_patch_integrity_checks();
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while (true)
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{
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@ -1106,7 +1158,7 @@ namespace arxan
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protect_texts();
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}
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//verify_handlers();
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/*utils::hook::set<uint8_t>(0x1423339C0_g, 0xC3);
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/utils::hook::set<uint8_t>(0x1423339C0_g, 0xC3);
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constexpr auto rdx_rbx = 0xda894890;
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constexpr auto rcx_rdx = 0xd1894890;
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@ -1127,7 +1179,7 @@ namespace arxan
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utils::hook::set<uint32_t>(0x15BFFF30D_g, rdx_rbx);
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utils::hook::set<uint32_t>(0x15DE3AAE7_g, rax_rcx);
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utils::hook::set<uint32_t>(0x15E48F80C_g, rbx_rax);*/
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}).detach();
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//}).detach();
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auto tid = GetCurrentThreadId();
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