565 lines
17 KiB
C#
565 lines
17 KiB
C#
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/*
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Copyright (C) 2011 de4dot@gmail.com
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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namespace de4dot.blocks.cflow {
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class BlockControlFlowDeobfuscator {
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Block block;
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InstructionEmulator instructionEmulator = new InstructionEmulator();
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public void init(Block block, IList<ParameterDefinition> args, IList<VariableDefinition> locals) {
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this.block = block;
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instructionEmulator.init(false, args, locals);
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}
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// Returns true if code was updated, false otherwise
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public bool deobfuscate() {
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var instructions = block.Instructions;
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if (instructions.Count == 0)
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return false;
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for (int i = 0; i < instructions.Count - 1; i++) {
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instructionEmulator.emulate(instructions[i].Instruction);
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}
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switch (block.LastInstr.OpCode.Code) {
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case Code.Beq:
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case Code.Beq_S: return emulate_Beq();
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case Code.Bge:
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case Code.Bge_S: return emulate_Bge();
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case Code.Bge_Un:
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case Code.Bge_Un_S: return emulate_Bge_Un();
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case Code.Bgt:
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case Code.Bgt_S: return emulate_Bgt();
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case Code.Bgt_Un:
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case Code.Bgt_Un_S: return emulate_Bgt_Un();
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case Code.Ble:
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case Code.Ble_S: return emulate_Ble();
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case Code.Ble_Un:
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case Code.Ble_Un_S: return emulate_Ble_Un();
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case Code.Blt:
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case Code.Blt_S: return emulate_Blt();
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case Code.Blt_Un:
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case Code.Blt_Un_S: return emulate_Blt_Un();
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case Code.Bne_Un:
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case Code.Bne_Un_S: return emulate_Bne_Un();
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case Code.Brfalse:
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case Code.Brfalse_S:return emulate_Brfalse();
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case Code.Brtrue:
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case Code.Brtrue_S: return emulate_Brtrue();
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default:
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return false;
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}
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}
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bool emulateBranch(int stackArgs, bool isTaken) {
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// Pop the arguments to the bcc instruction. The dead code remover will get rid of the
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// pop and any pushed arguments. Insert the pops just before the bcc instr.
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for (int i = 0; i < stackArgs; i++)
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block.insert(block.Instructions.Count - 1, Instruction.Create(OpCodes.Pop));
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block.replaceBccWithBranch(isTaken);
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return true;
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}
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bool emulate_Beq() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: If it's an unknown int32/64, push 1 if val1 is same ref as val2
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, int1.value == int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, long1.value == long2.value);
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}
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else if (val1.valueType == ValueType.Real8 && val2.valueType == ValueType.Real8) {
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var real1 = (Real8Value)val1;
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var real2 = (Real8Value)val2;
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return emulateBranch(2, real1.value == real2.value);
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}
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else if (val1.valueType == ValueType.Null && val2.valueType == ValueType.Null) {
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return emulateBranch(2, true);
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}
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else {
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return false;
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}
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}
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bool emulate_Bne_Un() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: If it's an unknown int32/64, push 1 if val1 is same ref as val2
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, (uint)int1.value != (uint)int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, (ulong)long1.value != (ulong)long2.value);
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}
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else if (val1.valueType == ValueType.Real8 && val2.valueType == ValueType.Real8) {
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var real1 = (Real8Value)val1;
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var real2 = (Real8Value)val2;
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return emulateBranch(2, real1.value != real2.value);
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}
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else if (val1.valueType == ValueType.Null && val2.valueType == ValueType.Null) {
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return emulateBranch(2, false);
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}
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else {
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return false;
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}
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}
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bool emulate_Bge() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: Support floats
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, int1.value >= int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, long1.value >= long2.value);
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}
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else if (val1.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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if (int1.value == int.MaxValue)
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return emulateBranch(2, true); // max >= x => true
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int32) {
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var int2 = (Int32Value)val2;
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if (int2.value == int.MinValue)
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return emulateBranch(2, true); // x >= min => true
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else
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return false;
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}
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else if (val1.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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if (long1.value == long.MaxValue)
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return emulateBranch(2, true); // max >= x => true
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int64) {
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var long2 = (Int64Value)val2;
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if (long2.value == long.MinValue)
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return emulateBranch(2, true); // x >= min => true
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else
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return false;
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}
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else {
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return false;
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}
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}
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bool emulate_Bge_Un() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: Support floats
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, (uint)int1.value >= (uint)int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, (ulong)long1.value >= (ulong)long2.value);
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}
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else if (val1.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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if ((uint)int1.value == uint.MaxValue)
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return emulateBranch(2, true); // max >= x => true
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int32) {
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var int2 = (Int32Value)val2;
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if ((uint)int2.value == uint.MinValue)
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return emulateBranch(2, true); // x >= min => true
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else
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return false;
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}
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else if (val1.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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if ((ulong)long1.value == ulong.MaxValue)
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return emulateBranch(2, true); // max >= x => true
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int64) {
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var long2 = (Int64Value)val2;
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if ((ulong)long2.value == ulong.MinValue)
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return emulateBranch(2, true); // x >= min => true
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else
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return false;
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}
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else {
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return false;
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}
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}
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bool emulate_Bgt() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: Support floats
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, int1.value > int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, long1.value > long2.value);
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}
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else if (val1.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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if (int1.value == int.MinValue)
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return emulateBranch(2, false); // min > x => false
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int32) {
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var int2 = (Int32Value)val2;
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if (int2.value == int.MaxValue)
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return emulateBranch(2, false); // x > max => false
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else
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return false;
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}
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else if (val1.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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if (long1.value == long.MinValue)
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return emulateBranch(2, false); // min > x => false
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int64) {
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var long2 = (Int64Value)val2;
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if (long2.value == long.MaxValue)
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return emulateBranch(2, false); // x > max => false
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else
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return false;
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}
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else {
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return false;
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}
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}
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bool emulate_Bgt_Un() {
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var val2 = instructionEmulator.pop();
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var val1 = instructionEmulator.pop();
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//TODO: Support floats
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if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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var int2 = (Int32Value)val2;
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return emulateBranch(2, (uint)int1.value > (uint)int2.value);
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}
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else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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var long2 = (Int64Value)val2;
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return emulateBranch(2, (ulong)long1.value > (ulong)long2.value);
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}
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else if (val1.valueType == ValueType.Int32) {
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var int1 = (Int32Value)val1;
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if ((uint)int1.value == uint.MinValue)
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return emulateBranch(2, false); // min > x => false
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int32) {
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var int2 = (Int32Value)val2;
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if ((uint)int2.value == uint.MaxValue)
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return emulateBranch(2, false); // x > max => false
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else
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return false;
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}
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else if (val1.valueType == ValueType.Int64) {
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var long1 = (Int64Value)val1;
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if ((ulong)long1.value == ulong.MinValue)
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return emulateBranch(2, false); // min > x => false
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else
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return false;
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}
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else if (val2.valueType == ValueType.Int64) {
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var long2 = (Int64Value)val2;
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if ((ulong)long2.value == ulong.MaxValue)
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return emulateBranch(2, false); // x > max => false
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else
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return false;
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}
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else {
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return false;
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}
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}
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bool emulate_Ble() {
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var val2 = instructionEmulator.pop();
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
return emulateBranch(2, int1.value <= int2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
return emulateBranch(2, long1.value <= long2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
if (int1.value == int.MinValue)
|
|||
|
|
return emulateBranch(2, true); // min <= x => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int32) {
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
if (int2.value == int.MaxValue)
|
|||
|
|
return emulateBranch(2, true); // x <= max => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
if (long1.value == long.MinValue)
|
|||
|
|
return emulateBranch(2, true); // min <= x => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int64) {
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
if (long2.value == long.MaxValue)
|
|||
|
|
return emulateBranch(2, true); // x <= max => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool emulate_Ble_Un() {
|
|||
|
|
var val2 = instructionEmulator.pop();
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
return emulateBranch(2, (uint)int1.value <= (uint)int2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
return emulateBranch(2, (ulong)long1.value <= (ulong)long2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
if ((uint)int1.value == uint.MinValue)
|
|||
|
|
return emulateBranch(2, true); // min <= x => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int32) {
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
if ((uint)int2.value == uint.MaxValue)
|
|||
|
|
return emulateBranch(2, true); // x <= max => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
if ((ulong)long1.value == ulong.MinValue)
|
|||
|
|
return emulateBranch(2, true); // min <= x => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int64) {
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
if ((ulong)long2.value == ulong.MaxValue)
|
|||
|
|
return emulateBranch(2, true); // x <= max => true
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool emulate_Blt() {
|
|||
|
|
var val2 = instructionEmulator.pop();
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
return emulateBranch(2, int1.value < int2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
return emulateBranch(2, long1.value < long2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
if (int1.value == int.MaxValue)
|
|||
|
|
return emulateBranch(2, false); // max < x => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int32) {
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
if (int2.value == int.MinValue)
|
|||
|
|
return emulateBranch(2, false); // x < min => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
if (long1.value == long.MaxValue)
|
|||
|
|
return emulateBranch(2, false); // max < x => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int64) {
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
if (long2.value == long.MinValue)
|
|||
|
|
return emulateBranch(2, false); // x < min => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool emulate_Blt_Un() {
|
|||
|
|
var val2 = instructionEmulator.pop();
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32 && val2.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
return emulateBranch(2, (uint)int1.value < (uint)int2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64 && val2.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
return emulateBranch(2, (ulong)long1.value < (ulong)long2.value);
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int32) {
|
|||
|
|
var int1 = (Int32Value)val1;
|
|||
|
|
if ((uint)int1.value == uint.MaxValue)
|
|||
|
|
return emulateBranch(2, false); // max < x => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int32) {
|
|||
|
|
var int2 = (Int32Value)val2;
|
|||
|
|
if ((uint)int2.value == uint.MinValue)
|
|||
|
|
return emulateBranch(2, false); // x < min => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val1.valueType == ValueType.Int64) {
|
|||
|
|
var long1 = (Int64Value)val1;
|
|||
|
|
if ((ulong)long1.value == ulong.MaxValue)
|
|||
|
|
return emulateBranch(2, false); // max < x => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else if (val2.valueType == ValueType.Int64) {
|
|||
|
|
var long2 = (Int64Value)val2;
|
|||
|
|
if ((ulong)long2.value == ulong.MinValue)
|
|||
|
|
return emulateBranch(2, false); // x < min => false
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
else {
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool emulate_Brfalse() {
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32)
|
|||
|
|
return emulateBranch(1, ((Int32Value)val1).value == 0);
|
|||
|
|
else if (val1.valueType == ValueType.Int64)
|
|||
|
|
return emulateBranch(1, ((Int64Value)val1).value == 0);
|
|||
|
|
else if (val1.valueType == ValueType.Null)
|
|||
|
|
return emulateBranch(1, true);
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool emulate_Brtrue() {
|
|||
|
|
var val1 = instructionEmulator.pop();
|
|||
|
|
|
|||
|
|
//TODO: Support floats
|
|||
|
|
|
|||
|
|
if (val1.valueType == ValueType.Int32)
|
|||
|
|
return emulateBranch(1, ((Int32Value)val1).value != 0);
|
|||
|
|
else if (val1.valueType == ValueType.Int64)
|
|||
|
|
return emulateBranch(1, ((Int64Value)val1).value != 0);
|
|||
|
|
else if (val1.valueType == ValueType.Null)
|
|||
|
|
return emulateBranch(1, false);
|
|||
|
|
else
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|