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115 lines
3.4 KiB
115 lines
3.4 KiB
#include "Obfuscator.h"
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XED_ICLASS_ENUM ObfGetRandomJccClass()
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{
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switch (RndGetRandomInt(0, 14))
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{
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case 0: return XED_ICLASS_JL;
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case 1: return XED_ICLASS_JLE;
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case 2: return XED_ICLASS_JNB;
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case 3: return XED_ICLASS_JNBE;
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case 4: return XED_ICLASS_JNL;
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case 5: return XED_ICLASS_JNLE;
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case 6: return XED_ICLASS_JNO;
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case 7: return XED_ICLASS_JNP;
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case 8: return XED_ICLASS_JNS;
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case 9: return XED_ICLASS_JNZ;
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case 10: return XED_ICLASS_JO;
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case 11: return XED_ICLASS_JP;
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case 13: return XED_ICLASS_JS;
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case 14: return XED_ICLASS_JZ;
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}
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return XED_ICLASS_JLE;
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}
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PNATIVE_CODE_LINK ObfGenRandomJcc(ULONG LabelId, ULONG DisplacementWidth)
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{
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XED_STATE MachineState;
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MachineState.mmode = XED_MACHINE_MODE_LONG_64;
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MachineState.stack_addr_width = XED_ADDRESS_WIDTH_64b;
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XED_ENCODER_INSTRUCTION EncoderInstruction;
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XED_ENCODER_REQUEST EncoderRequest;
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UCHAR EncodeBuffer[15];
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UINT ReturnedSize;
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XedInst1(&EncoderInstruction, MachineState, ObfGetRandomJccClass(), DisplacementWidth, XedRelBr(0, DisplacementWidth));
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XedEncoderRequestZeroSetMode(&EncoderRequest, &MachineState);
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if (!XedConvertToEncoderRequest(&EncoderRequest, &EncoderInstruction))
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return NULL;
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if (XED_ERROR_NONE != XedEncode(&EncoderRequest, EncodeBuffer, 15, &ReturnedSize))
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return NULL;
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PNATIVE_CODE_LINK Link = new NATIVE_CODE_LINK(CODE_FLAG_IS_INST, EncodeBuffer, ReturnedSize);
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if (XED_ERROR_NONE != XedDecode(&Link->XedInstruction, Link->RawData, Link->RawDataSize))
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{
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delete Link;
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return NULL;
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}
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Link->Label = LabelId;
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Link->Flags = (CODE_FLAG_IS_INST | CODE_FLAG_IS_REL_JMP);
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return Link;
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}
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PNATIVE_CODE_LINK ObfGenJmpToLabel(ULONG LabelId, ULONG DisplacementWidth)
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{
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XED_STATE MachineState;
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MachineState.mmode = XED_MACHINE_MODE_LONG_64;
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MachineState.stack_addr_width = XED_ADDRESS_WIDTH_64b;
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XED_ENCODER_INSTRUCTION EncoderInstruction;
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XED_ENCODER_REQUEST EncoderRequest;
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UCHAR EncodeBuffer[15];
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UINT ReturnedSize;
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XedInst1(&EncoderInstruction, MachineState, XED_ICLASS_JMP, DisplacementWidth, XedRelBr(0, DisplacementWidth));
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XedEncoderRequestZeroSetMode(&EncoderRequest, &MachineState);
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if (!XedConvertToEncoderRequest(&EncoderRequest, &EncoderInstruction))
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return NULL;
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if (XED_ERROR_NONE != XedEncode(&EncoderRequest, EncodeBuffer, 15, &ReturnedSize))
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return NULL;
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PNATIVE_CODE_LINK Link = new NATIVE_CODE_LINK(CODE_FLAG_IS_INST, EncodeBuffer, ReturnedSize);
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if (XED_ERROR_NONE != XedDecode(&Link->XedInstruction, Link->RawData, Link->RawDataSize))
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{
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delete Link;
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return NULL;
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}
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Link->Label = LabelId;
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Link->Flags = (CODE_FLAG_IS_INST | CODE_FLAG_IS_REL_JMP);
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return Link;
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}
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BOOL ObfCreateOpaqueBranches(PNATIVE_CODE_LINK Start, PNATIVE_CODE_LINK End, PNATIVE_CODE_BLOCK NotTaken, PNATIVE_CODE_BLOCK Taken)
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{
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return (NcDeepCopyPartialBlock(Start, End, Taken) && !NcDeepCopyPartialBlock(Start, End, NotTaken));
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}
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BOOL ObfCombineOpaqueBranches(PNATIVE_CODE_BLOCK NotTaken, PNATIVE_CODE_BLOCK Taken, ULONG JccLabel, ULONG JmpLabel)
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{
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PNATIVE_CODE_LINK Jcc = ObfGenRandomJcc(JccLabel);
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if (!Jcc)
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return FALSE;
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PNATIVE_CODE_LINK Jmp = ObfGenJmpToLabel(JmpLabel);
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if (!Jmp)
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{
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delete Jcc;
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return FALSE;
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}
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NcPrependToBlock(NotTaken, Jcc);
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NcAppendToBlock(NotTaken, Jmp);
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NcPrependToBlock(Taken, new NATIVE_CODE_LINK(JccLabel, Taken));
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NcAppendToBlock(Taken, new NATIVE_CODE_LINK(JmpLabel, Taken));
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NcInsertBlockAfter(NotTaken->End, Taken, FALSE);
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NotTaken->End = Taken->End;
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return TRUE;
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}
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