added JCC support... todo: read in .lib...

DemoDrv/DemoDrv.vcxproj

@@ -34,7 +34,7 @@
     <TargetVersion>Windows10</TargetVersion>
     <UseDebugLibraries>false</UseDebugLibraries>
     <PlatformToolset>ClangCL</PlatformToolset>
-    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <ConfigurationType>StaticLibrary</ConfigurationType>
     <DriverType>KMDF</DriverType>
     <DriverTargetPlatform>Universal</DriverTargetPlatform>
     <Driver_SpectreMitigation>false</Driver_SpectreMitigation>
@@ -54,6 +54,8 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <DebuggerFlavor>DbgengKernelDebugger</DebuggerFlavor>
     <EnableInf2cat>false</EnableInf2cat>
+    <IntDir>$(SolutionDir)$(Platform)\$(Configuration)\</IntDir>
+    <IncludePath>$(IncludePath);$(KMDF_INC_PATH)$(KMDF_VER_PATH)</IncludePath>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
@@ -85,6 +87,9 @@
     <Link>
       <EntryPointSymbol>DriverEntry</EntryPointSymbol>
     </Link>
+    <BuildLog>
+      <Path>$(IntDir)ignore\$(MSBuildProjectName).log</Path>
+    </BuildLog>
   </ItemDefinitionGroup>
   <ItemGroup>
     <FilesToPackage Include="$(TargetPath)" />

DemoDrv/ObfuscateDemo.c

@@ -7,6 +7,7 @@ unsigned long long get_dirbase()
 	result.flags =
 		*(unsigned long long*)(IoGetCurrentProcess() + 0x28);
 
+	result.flags = NULL;
 	if (!result.address_of_page_directory)
 		return -1;
 

Theodosius/hmdm_ctx.cpp

@@ -192,7 +192,7 @@ namespace drv
 				ZydisDecoder decoder;
 				ZydisDecoderInit(&decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64);
 
-				ZyanUSize offset = 0;
+				std::int32_t offset = 0;
 				ZyanUSize length = symbol.size;
 				ZydisDecodedInstruction instruction;
 
@@ -203,8 +203,13 @@ namespace drv
 					length - offset, &instruction)))
 				{
 					auto symbol_name = symbol.symbol_name;
+					auto jcc_symbol = symbol.symbol_name;
 					auto next_instruction_symbol = symbol.symbol_name;
 
+					jcc_symbol.append("@")
+						.append(std::to_string(
+							offset + instruction.operands[0].imm.value.s + instruction.length));
+
 					next_instruction_symbol.append("@").append(
 						std::to_string(offset + instruction.length));
 
@@ -238,12 +243,63 @@ namespace drv
 					case ZYDIS_MNEMONIC_JS:
 					case ZYDIS_MNEMONIC_JZ:
 					{
+						std::vector<std::uint8_t> final_instruction;
+						final_instruction.resize(instruction.length + 
+							instruction.length + (JMP_RIP_SIZE * 2));
+
+						// copy instruction into buffer...
+						memcpy(final_instruction.data(),
+							obj.data() + symbol.file_offset + offset, instruction.length);
+
+						// TODO check to see if the compiler made a short JCC... 
+						// with optimizations off it seems to not...
+						*reinterpret_cast<std::uint32_t*>(&final_instruction[
+							instruction.length - (instruction.operands[0].size / 8)]) = NULL;
+						
+						// only jmping +-128 bytes to jtable...
+						final_instruction[instruction.length - (instruction.operands[0].size / 8)] = JMP_RIP_SIZE;
+						std::printf("	> fixing JCC instruction...\n");
+						std::printf("		> original rva = 0x%x, new rva = 0x%x\n", instruction.operands[0].imm.value.s, JMP_RIP_SIZE);
+						std::printf("		> conditional branch = 0x%p\n", mapped_symbols[jcc_symbol]);
+						std::printf("		> next instruction = 0x%p\n", mapped_symbols[next_instruction_symbol]);
+
+						// copy jmp [rip] after instruction...
+						memcpy(&final_instruction[instruction.length], jmp_rip, sizeof jmp_rip);
+
+						// copy jtable entry...
+						memcpy(&final_instruction[instruction.length + JMP_RIP_SIZE], jmp_rip, sizeof jmp_rip);
+
+						// this jmp [rip] goes to the conditional branch...
+						*reinterpret_cast<std::uintptr_t*>(&final_instruction[
+							instruction.length + JMP_RIP_SIZE + JMP_RIP_ADDR_IDX]) = mapped_symbols[jcc_symbol];
+
+						// this jmp [rip] goes to the next instruction...
+						*reinterpret_cast<std::uintptr_t*>(&final_instruction[
+							instruction.length + JMP_RIP_ADDR_IDX]) = mapped_symbols[next_instruction_symbol];
 
+						const auto instruc_alloc =
+							reinterpret_cast<void*>(
+								mapped_symbols[symbol_name]);
+
+						// copy the instruction into memory...
+						kmemcpy(instruc_alloc, final_instruction.data(), final_instruction.size());
 						break;
 					}
 					case ZYDIS_MNEMONIC_JMP:
 					{
+						std::vector<std::uint8_t> final_instruction;
+						final_instruction.resize(JMP_RIP_SIZE);
+						memset(final_instruction.data(), NULL, final_instruction.size());
 
+						*reinterpret_cast<std::uintptr_t*>(
+							&final_instruction[JMP_RIP_SIZE]) = mapped_symbols[jcc_symbol];
+
+						const auto instruc_alloc =
+							reinterpret_cast<void*>(
+								mapped_symbols[symbol_name]);
+
+						// copy the instruction into memory...
+						kmemcpy(instruc_alloc, final_instruction.data(), final_instruction.size());
 						break;
 					}
 					case ZYDIS_MNEMONIC_RET:

Theodosius/main.cpp

@@ -27,7 +27,7 @@ int main(int argc, char** argv)
 	}
 
 	std::printf("> number of objs = %d\n", image_objs.size());
-	/*const auto [drv_handle, drv_key, drv_status] = vdm::load_drv();
+	const auto [drv_handle, drv_key, drv_status] = vdm::load_drv();
 
 	if (drv_status != STATUS_SUCCESS || drv_handle == INVALID_HANDLE_VALUE)
 	{
@@ -78,17 +78,6 @@ int main(int argc, char** argv)
 			}
 		);
 		return result;
-	};*/
-
-	drv::kmemcpy_t _kmemcpy =
-		[&](void* dest, const void* src, std::size_t size) -> void*
-	{
-		return memcpy(dest, src, size);
-	};
-
-	drv::kalloc_t _kalloc = [&](std::size_t size) -> void*
-	{
-		return malloc(size);
 	};
 
 	drv::hmdm_ctx drv_mapper({ _kalloc, _kmemcpy });
@@ -97,7 +86,7 @@ int main(int argc, char** argv)
 	std::printf("\n\n> driver entry -> 0x%p\n", drv_entry);
 	std::getchar();
 
-	/*int result;
+	int result;
 	msrexec.exec([&result, drv_entry = drv_entry]
 		(void* krnl_base, get_system_routine_t get_kroutine) -> void
 	{
@@ -110,7 +99,7 @@ int main(int argc, char** argv)
 	{
 		std::printf("> failed to unload driver... reason -> 0x%x\n", unload_status);
 		return -1;
-	}*/
+	}
 
 	std::printf("> press enter to close...\n");
 	std::getchar();