First working patch with hooking support :D
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63d2acbde6
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@ -482,6 +482,7 @@ namespace arxan
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}
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};
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bool patchMode = true;
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std::unordered_map<uint64_t, integrity_handler_data> integrity_handlers;
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void load_handlers()
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@ -686,70 +687,102 @@ namespace arxan
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info->ContextRecord->EFlags |= 0x0100;
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const auto data = *reinterpret_cast<uint32_t*>(info->ContextRecord->Rip);
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if ((data & 0xFFFFFF) == 0x8A0489 && !integrity_handlers.contains(info->ContextRecord->Rip))
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if ((data & 0xFFFFFF) == 0x8A0489)
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{
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auto checksum = static_cast<uint32_t>(info->ContextRecord->Rax);
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auto offset = static_cast<int64_t>(info->ContextRecord->Rcx);
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if (offset != 0)
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{
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OutputDebugStringA(utils::string::va("OFFSET: %X\n", offset));
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}
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auto handler = integrity_handlers.find(info->ContextRecord->Rip);
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const auto contains = handler != integrity_handlers.end();
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std::vector<uint32_t> discoveries{};
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for (uint32_t stack = 0x30; stack < 0x80; stack += 8)
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if (patchMode)
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{
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auto* value_ptr = *(uint32_t**)(info->ContextRecord->Rbp + stack);
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auto* _addr = &value_ptr[offset];
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if (IsBadReadPtr(_addr, 4) || *_addr != checksum)
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unprotect_texts();
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if (!contains)
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{
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continue;
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OutputDebugStringA("Unknown handler executed :(");
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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discoveries.push_back(stack);
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const auto old = info->ContextRecord->Rax;
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auto h = (integrity_handler_context*)(info->ContextRecord->Rbp + handler->second.frame_offset);
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*h->computed_checksum = *h->original_checksum;
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info->ContextRecord->Rax = *h->original_checksum;
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static bool once = false;
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if (!once)
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{
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//once = true;
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OutputDebugStringA(utils::string::va("Adjusted wrong checksum: %X -> %X (%X)", old, *h->original_checksum, handler->second.checksum));
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}
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return EXCEPTION_CONTINUE_EXECUTION;
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}
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if (discoveries.size() != 2)
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if (!contains)
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{
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OutputDebugStringA(utils::string::va(
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"!!! Unknown handler: %llX - Checksum: %X | rbp: %llX - offset: %X | discoveries: %zX",
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info->ContextRecord->Rip,
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checksum, info->ContextRecord->Rbp, offset, discoveries.size()));
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auto checksum = static_cast<uint32_t>(info->ContextRecord->Rax);
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auto offset = static_cast<int64_t>(info->ContextRecord->Rcx);
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if (offset != 0)
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{
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OutputDebugStringA(utils::string::va("OFFSET: %X\n", offset));
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}
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for (auto discovery : discoveries)
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std::vector<uint32_t> discoveries{};
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for (uint32_t stack = 0x30; stack < 0x80; stack += 8)
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{
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auto* value_ptr = *(uint32_t**)(info->ContextRecord->Rbp + stack);
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auto* _addr = &value_ptr[offset];
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if (IsBadReadPtr(_addr, 4) || *_addr != checksum)
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{
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continue;
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}
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discoveries.push_back(stack);
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}
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if (discoveries.size() != 2)
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{
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OutputDebugStringA(utils::string::va(
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"%X --> %llX",
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discovery, *(uint32_t**)(info->ContextRecord->Rbp + discovery) + offset));
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"!!! Unknown handler: %llX - Checksum: %X | rbp: %llX - offset: %X | discoveries: %zX",
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info->ContextRecord->Rip,
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checksum, info->ContextRecord->Rbp, offset, discoveries.size()));
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for (auto discovery : discoveries)
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{
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OutputDebugStringA(utils::string::va(
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"%X --> %llX",
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discovery, *(uint32_t**)(info->ContextRecord->Rbp + discovery) + offset));
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}
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}
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}
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else
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{
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uint32_t* value_ptrs[] = {
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*(uint32_t**)(info->ContextRecord->Rbp + discoveries[0]) + offset,
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*(uint32_t**)(info->ContextRecord->Rbp + discoveries[1]) + offset
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};
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else
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{
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uint32_t* value_ptrs[] = {
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*(uint32_t**)(info->ContextRecord->Rbp + discoveries[0]) + offset,
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*(uint32_t**)(info->ContextRecord->Rbp + discoveries[1]) + offset
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};
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auto diff_0 = std::abs((int64_t)info->ContextRecord->Rbp - (int64_t)value_ptrs[0]);
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auto diff_1 = std::abs((int64_t)info->ContextRecord->Rbp - (int64_t)value_ptrs[1]);
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auto diff_0 = std::abs((int64_t)info->ContextRecord->Rbp - (int64_t)value_ptrs[0]);
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auto diff_1 = std::abs((int64_t)info->ContextRecord->Rbp - (int64_t)value_ptrs[1]);
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auto store_index = diff_0 < diff_1 ? 0 : 1;
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auto other_index = 1 - store_index;
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auto store_index = diff_0 < diff_1 ? 0 : 1;
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auto other_index = 1 - store_index;
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OutputDebugStringA(utils::string::va(
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"Handler: %llX\t| Checksum: %X\t| Checksum in memory: %llX\t(%X)\t| Calculated checksum location: %llX\t(%X)",
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info->ContextRecord->Rip,
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checksum, value_ptrs[other_index], discoveries[other_index], value_ptrs[store_index],
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discoveries[store_index]));
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OutputDebugStringA(utils::string::va(
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"Handler: %llX\t| Checksum: %X\t| Checksum in memory: %llX\t(%X)\t| Calculated checksum location: %llX\t(%X)",
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info->ContextRecord->Rip,
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checksum, value_ptrs[other_index], discoveries[other_index], value_ptrs[store_index],
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discoveries[store_index]));
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integrity_handler_data h{};
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h.address = reverse_g(info->ContextRecord->Rip);
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h.checksum = checksum;
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h.checksum_address = reverse_g(value_ptrs[other_index]);
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h.frame_offset = discoveries[store_index];
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integrity_handler_data h{};
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h.address = reverse_g(info->ContextRecord->Rip);
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h.checksum = checksum;
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h.checksum_address = reverse_g(value_ptrs[other_index]);
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h.frame_offset = discoveries[store_index];
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integrity_handlers[info->ContextRecord->Rip] = h;
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write_handlers();
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integrity_handlers[info->ContextRecord->Rip] = h;
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write_handlers();
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}
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}
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}
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/* OutputDebugStringA(utils::string::va("Switch at: %llX -> %llX (%llX -> %llX)", addr,
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@ -903,6 +936,8 @@ namespace arxan
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{
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MessageBoxA(0, 0, 0, 0);
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protect_texts();
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if (patchMode)
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utils::hook::set<uint8_t>(0x1423339C0_g, 0xC3);
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}).detach();
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