opaque branching done

CodeVirtualizer/Main.cpp

@@ -6,6 +6,7 @@
 #include "NativeCode.h"
 #include "RipXorInst.h"
 #include "RipMovInst.h"
+#include "OpaqueBranching.h"
 
 UCHAR TestBuffer[]{
 	0x48, 0x33, 0xC0,
@@ -29,53 +30,18 @@ ULONG TestBufferSize = sizeof(TestBuffer);
 int main()
 {
 	XedTablesInit();
-	xed_state_t state;
+	srand(time(NULL));
-	state.mmode = XED_MACHINE_MODE_LONG_64;
-	state.stack_addr_width = XED_ADDRESS_WIDTH_64b;
 
-	xed_encoder_instruction_t inst;
+	NATIVE_CODE_BLOCK Block;
-
+	NcDisassemble(&Block, TestBuffer, TestBufferSize);
-	//xed_inst2(&inst, state, XED_ICLASS_ADD, 0, xed_reg(XED_REG_EAX),
+	PNATIVE_CODE_BLOCK OpaqueBranch = ObfGenOpaqueBranch(Block.Start, Block.End);
-	//	xed_mem_bd(XED_REG_EDX, xed_disp(0x11223344, 32), 32));
+	NcDebugPrint(OpaqueBranch);
-
+	system("pause");
-	xed_inst1(&inst, state, XED_ICLASS_JLE, 32, xed_relbr(0x1776, 32));
-
-	xed_encoder_request_t request;
-	xed_encoder_request_zero_set_mode(&request, &state);
-	if (!xed_convert_to_encoder_request(&request, &inst))
-	{
-		printf("failed to convert instruction.\n");
-		system("pause");
-		return -1;
-	}
-
-	unsigned char storage[15];
-	unsigned int len;
-
-	xed_error_enum_t err = xed_encode(&request, storage, 15, &len);
-	if (err != XED_ERROR_NONE)
-	{
-		printf("XedEncode failed with error %s\n", XedErrorEnumToString(err));
-		system("pause");
-		return FALSE;
-	}
-	printf("len: %u\n", len);
-	for (int i = 0; i < len; i++)
-	{
-		std::cout << std::setw(2) << std::setfill('0') << std::hex << (INT)storage[i] << ' ';
-	}
-	std::cout << '\n';
 
-	return -1;
 
 
-	NATIVE_CODE_BLOCK Block;
-
-	XedTablesInit();
-	NcDisassemble(&Block, TestBuffer, TestBufferSize);
-	NcDebugPrint(&Block);
 
-	NATIVE_CODE_LINK T;
+	/*NATIVE_CODE_LINK T;
 	T.RawDataSize = 10;
 	T.RawData = new UCHAR[10];
 	memset(T.RawData, 0xAA, 10);
@@ -88,7 +54,7 @@ int main()
 		NcDebugPrint(NewBlock);
 		printf("\n");
 		NcPrintBlockCode(NewBlock);
-	}
+	}*/
 	//PNATIVE_CODE_LINK temp = new NATIVE_CODE_LINK("Hello");
 	system("pause");
 	

CodeVirtualizer/OpaqueBranching.cpp

@@ -4,10 +4,23 @@ XED_ICLASS_ENUM ObfGetRandomJccClass()
 {
 	switch (rand() % 15)
 	{
-
+	case 0: return XED_ICLASS_JL;
-	default:
+	case 1: return XED_ICLASS_JLE;
-			return XED_ICLASS_JLE;
+	case 2:	return XED_ICLASS_JNB;
+	case 3: return XED_ICLASS_JNBE;
+	case 4: return XED_ICLASS_JNL;
+	case 5: return XED_ICLASS_JNLE;
+	case 6: return XED_ICLASS_JNO;
+	case 7: return XED_ICLASS_JNP;
+	case 8: return XED_ICLASS_JNS;
+	case 9: return XED_ICLASS_JNZ;
+	case 10: return XED_ICLASS_JO;
+	case 11: return XED_ICLASS_JP;
+	case 12: return XED_ICLASS_JRCXZ;
+	case 13: return XED_ICLASS_JS;
+	case 14: return XED_ICLASS_JZ;
 	}
+	return XED_ICLASS_JLE;
 }
 
 PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementWidth)
@@ -17,11 +30,10 @@ PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementWidth)
 	MachineState.stack_addr_width = XED_ADDRESS_WIDTH_64b;
 	XED_ENCODER_INSTRUCTION EncoderInstruction;
 	XED_ENCODER_REQUEST EncoderRequest;
-	ULONG DispWidth = ((rand() % 2) ? 16 : 32);
 	UCHAR EncodeBuffer[15];
 	UINT ReturnedSize;
 
-	XedInst1(&EncoderInstruction, MachineState, ObfGetRandomJccClass(), DispWidth, XedRelBr(0, DispWidth));
+	XedInst1(&EncoderInstruction, MachineState, ObfGetRandomJccClass(), DisplacementWidth, XedRelBr(0, DisplacementWidth));
 
 	XedEncoderRequestZeroSetMode(&EncoderRequest, &MachineState);
 	if (!XedConvertToEncoderRequest(&EncoderRequest, &EncoderInstruction))
@@ -37,16 +49,43 @@ PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementWidth)
 			return NULL;
 	}
 	Link->Label = LabelId;
+	Link->Flags = (CODE_FLAG_IS_INST | CODE_FLAG_IS_REL_JMP);
 
 	return Link;
 }
 
-PNATIVE_CODE_LINK ObfGenJmpForOpaqueBranch(ULONG LabelId, ULONG DisplacementWidth)
+PNATIVE_CODE_LINK ObfGenJmpToLabel(ULONG LabelId, ULONG DisplacementWidth)
 {
-	return NULL;
+	XED_STATE MachineState;
+	MachineState.mmode = XED_MACHINE_MODE_LONG_64;
+	MachineState.stack_addr_width = XED_ADDRESS_WIDTH_64b;
+	XED_ENCODER_INSTRUCTION EncoderInstruction;
+	XED_ENCODER_REQUEST EncoderRequest;
+	UCHAR EncodeBuffer[15];
+	UINT ReturnedSize;
+
+	XedInst1(&EncoderInstruction, MachineState, XED_ICLASS_JMP, DisplacementWidth, XedRelBr(0, DisplacementWidth));
+
+	XedEncoderRequestZeroSetMode(&EncoderRequest, &MachineState);
+	if (!XedConvertToEncoderRequest(&EncoderRequest, &EncoderInstruction))
+		return NULL;
+
+	if (XED_ERROR_NONE != XedEncode(&EncoderRequest, EncodeBuffer, 15, &ReturnedSize))
+		return NULL;
+
+	PNATIVE_CODE_LINK Link = new NATIVE_CODE_LINK(CODE_FLAG_IS_INST, EncodeBuffer, ReturnedSize);
+	if (XED_ERROR_NONE != XedDecode(&Link->XedInstruction, Link->RawData, Link->RawDataSize))
+	{
+		delete Link;
+		return NULL;
+	}
+	Link->Label = LabelId;
+	Link->Flags = (CODE_FLAG_IS_INST | CODE_FLAG_IS_REL_JMP);
+
+	return Link;
 }
 
-PNATIVE_CODE_BLOCK ObfGenerateOpaqueBranch(PNATIVE_CODE_LINK Start, PNATIVE_CODE_LINK End)
+PNATIVE_CODE_BLOCK ObfGenOpaqueBranch(PNATIVE_CODE_LINK Start, PNATIVE_CODE_LINK End)
 {
 	if (!Start || !End || !Start->Block || Start->Block != End->Block)
 		return NULL;
@@ -78,7 +117,7 @@ PNATIVE_CODE_BLOCK ObfGenerateOpaqueBranch(PNATIVE_CODE_LINK Start, PNATIVE_CODE
 		delete NotTaken;
 		return NULL;
 	}
-	PNATIVE_CODE_LINK Jmp = ObfGenJmpForOpaqueBranch(JmpLabel);
+	PNATIVE_CODE_LINK Jmp = ObfGenJmpToLabel(JmpLabel);
 	if (!Jmp)
 	{
 		delete Jcc;

CodeVirtualizer/OpaqueBranching.h

@@ -7,11 +7,11 @@
 
 XED_ICLASS_ENUM ObfGetRandomJccClass();
 
-PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementSize = 4);
+PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementSize = 32);
 
-PNATIVE_CODE_LINK ObfGenJmpForOpaqueBranch(ULONG LabelId, ULONG DisplacementSize = 4);
+PNATIVE_CODE_LINK ObfGenJmpToLabel(ULONG LabelId, ULONG DisplacementSize = 32);
 
-PNATIVE_CODE_BLOCK ObfGenerateOpaqueBranch(PNATIVE_CODE_LINK Start, PNATIVE_CODE_LINK End);
+PNATIVE_CODE_BLOCK ObfGenOpaqueBranch(PNATIVE_CODE_LINK Start, PNATIVE_CODE_LINK End);