525 lines
20 KiB
C#
525 lines
20 KiB
C#
/*
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Copyright (C) 2011-2012 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;
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using System.Collections.Generic;
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using System.IO;
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using de4dot.blocks;
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using dot10.DotNet;
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using dot10.DotNet.Emit;
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namespace de4dot.code.deobfuscators.Agile_NET.vm {
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partial class OpCodeHandler {
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public string Name { get; set; }
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public OpCodeHandlerSigInfo OpCodeHandlerSigInfo { get; set; }
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public Predicate<UnknownHandlerInfo> Check { get; set; }
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public Func<BinaryReader, Instruction> Read { get; set; }
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public bool detect(UnknownHandlerInfo info) {
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var sigInfo = OpCodeHandlerSigInfo;
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if (!compare(sigInfo.NumStaticMethods, info.NumStaticMethods))
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return false;
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if (!compare(sigInfo.NumInstanceMethods, info.NumInstanceMethods))
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return false;
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if (!compare(sigInfo.NumVirtualMethods, info.NumVirtualMethods))
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return false;
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if (!compare(sigInfo.NumCtors, info.NumCtors))
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return false;
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if (!compare(sigInfo.ExecuteMethodThrows, info.ExecuteMethodThrows))
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return false;
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if (!compare(sigInfo.ExecuteMethodPops, info.ExecuteMethodPops))
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return false;
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if (!info.hasSameFieldTypes(sigInfo.RequiredFieldTypes))
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return false;
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if (sigInfo.ExecuteMethodLocals != null && !new LocalTypes(info.ExecuteMethod).all(sigInfo.ExecuteMethodLocals))
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return false;
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if (Check != null)
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return Check(info);
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return true;
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}
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static bool compare(int? val1, int val2) {
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if (!val1.HasValue)
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return true;
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return val1.Value == val2;
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}
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public override string ToString() {
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return Name;
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}
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}
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static partial class OpCodeHandlers {
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static Instruction arithmetic_read(BinaryReader reader) {
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switch (reader.ReadByte()) {
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case 0: return Instruction.Create(OpCodes.Add);
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case 1: return Instruction.Create(OpCodes.Add_Ovf);
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case 2: return Instruction.Create(OpCodes.Add_Ovf_Un);
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case 3: return Instruction.Create(OpCodes.Sub);
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case 4: return Instruction.Create(OpCodes.Sub_Ovf);
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case 5: return Instruction.Create(OpCodes.Sub_Ovf_Un);
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case 6: return Instruction.Create(OpCodes.Mul);
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case 7: return Instruction.Create(OpCodes.Mul_Ovf);
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case 8: return Instruction.Create(OpCodes.Mul_Ovf_Un);
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case 9: return Instruction.Create(OpCodes.Div);
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case 10: return Instruction.Create(OpCodes.Div_Un);
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case 11: return Instruction.Create(OpCodes.Rem);
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case 12: return Instruction.Create(OpCodes.Rem_Un);
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default: throw new ApplicationException("Invalid opcode");
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}
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}
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static bool newarr_check(UnknownHandlerInfo info) {
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return DotNetUtils.callsMethod(info.ExecuteMethod, "System.Type System.Reflection.Module::ResolveType(System.Int32)");
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}
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static Instruction newarr_read(BinaryReader reader) {
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return new Instruction {
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OpCode = OpCodes.Newarr,
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Operand = new TokenOperand(reader.ReadInt32()),
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};
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}
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static Instruction box_read(BinaryReader reader) {
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var instr = new Instruction();
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switch (reader.ReadByte()) {
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case 0: instr.OpCode = OpCodes.Box; break;
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case 1: instr.OpCode = OpCodes.Unbox_Any; break;
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default: throw new ApplicationException("Invalid opcode");
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}
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instr.Operand = new TokenOperand(reader.ReadInt32());
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return instr;
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}
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static Instruction call_read(BinaryReader reader) {
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var instr = new Instruction();
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switch (reader.ReadByte()) {
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case 0: instr.OpCode = OpCodes.Newobj; break;
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case 1: instr.OpCode = OpCodes.Call; break;
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case 2: instr.OpCode = OpCodes.Callvirt; break;
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default: throw new ApplicationException("Invalid opcode");
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}
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instr.Operand = new TokenOperand(reader.ReadInt32());
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return instr;
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}
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static Instruction cast_read(BinaryReader reader) {
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var instr = new Instruction();
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switch (reader.ReadByte()) {
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case 0: instr.OpCode = OpCodes.Castclass; break;
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case 1: instr.OpCode = OpCodes.Isinst; break;
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default: throw new ApplicationException("Invalid opcode");
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}
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instr.Operand = new TokenOperand(reader.ReadInt32());
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return instr;
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}
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static Instruction compare_read(BinaryReader reader) {
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int type = reader.ReadByte();
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Instruction instr = new Instruction();
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switch (type) {
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case 0: instr.OpCode = OpCodes.Br; break;
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case 1: instr.OpCode = OpCodes.Brtrue; break;
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case 2: instr.OpCode = OpCodes.Brfalse; break;
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case 3: instr.OpCode = OpCodes.Beq; break;
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case 4: instr.OpCode = OpCodes.Bge; break;
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case 5: instr.OpCode = OpCodes.Bgt; break;
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case 6: instr.OpCode = OpCodes.Ble; break;
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case 7: instr.OpCode = OpCodes.Blt; break;
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case 8: instr.OpCode = OpCodes.Bne_Un; break;
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case 9: instr.OpCode = OpCodes.Bge_Un; break;
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case 10: instr.OpCode = OpCodes.Bgt_Un; break;
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case 11: instr.OpCode = OpCodes.Ble_Un; break;
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case 12: instr.OpCode = OpCodes.Blt_Un; break;
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case 13: instr.OpCode = OpCodes.Ceq; break;
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case 14: instr.OpCode = OpCodes.Cgt; break;
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case 15: instr.OpCode = OpCodes.Clt; break;
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case 16: instr.OpCode = OpCodes.Cgt_Un; break;
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case 17: instr.OpCode = OpCodes.Clt_Un; break;
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default: throw new ApplicationException("Invalid opcode");
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}
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if (type < 13)
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instr.Operand = new TargetDisplOperand(reader.ReadInt32());
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return instr;
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}
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class InstructionInfo1 {
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public byte Type { get; set; }
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public bool Second { get; set; }
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public bool Third { get; set; }
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public OpCode OpCode { get; set; }
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}
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static List<InstructionInfo1> instructionInfos1 = new List<InstructionInfo1> {
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new InstructionInfo1 { Type = 0, Second = false, Third = false, OpCode = OpCodes.Conv_I1 },
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new InstructionInfo1 { Type = 1, Second = false, Third = false, OpCode = OpCodes.Conv_I2 },
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new InstructionInfo1 { Type = 2, Second = false, Third = false, OpCode = OpCodes.Conv_I4 },
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new InstructionInfo1 { Type = 3, Second = false, Third = false, OpCode = OpCodes.Conv_I8 },
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new InstructionInfo1 { Type = 4, Second = false, Third = false, OpCode = OpCodes.Conv_R4 },
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new InstructionInfo1 { Type = 5, Second = false, Third = false, OpCode = OpCodes.Conv_R8 },
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new InstructionInfo1 { Type = 6, Second = false, Third = false, OpCode = OpCodes.Conv_U1 },
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new InstructionInfo1 { Type = 7, Second = false, Third = false, OpCode = OpCodes.Conv_U2 },
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new InstructionInfo1 { Type = 8, Second = false, Third = false, OpCode = OpCodes.Conv_U4 },
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new InstructionInfo1 { Type = 9, Second = false, Third = false, OpCode = OpCodes.Conv_U8 },
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new InstructionInfo1 { Type = 10, Second = false, Third = false, OpCode = OpCodes.Conv_I },
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new InstructionInfo1 { Type = 11, Second = false, Third = false, OpCode = OpCodes.Conv_U },
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new InstructionInfo1 { Type = 0, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_I1 },
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new InstructionInfo1 { Type = 1, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_I2 },
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new InstructionInfo1 { Type = 2, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_I4 },
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new InstructionInfo1 { Type = 3, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_I8 },
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new InstructionInfo1 { Type = 6, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_U1 },
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new InstructionInfo1 { Type = 7, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_U2 },
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new InstructionInfo1 { Type = 8, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_U4 },
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new InstructionInfo1 { Type = 9, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_U8 },
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new InstructionInfo1 { Type = 10, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_I },
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new InstructionInfo1 { Type = 11, Second = true, Third = false, OpCode = OpCodes.Conv_Ovf_U },
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new InstructionInfo1 { Type = 0, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_I1_Un },
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new InstructionInfo1 { Type = 1, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_I2_Un },
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new InstructionInfo1 { Type = 2, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_I4_Un },
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new InstructionInfo1 { Type = 3, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_I8_Un },
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new InstructionInfo1 { Type = 6, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_U1_Un },
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new InstructionInfo1 { Type = 7, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_U2_Un },
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new InstructionInfo1 { Type = 8, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_U4_Un },
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new InstructionInfo1 { Type = 9, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_U8_Un },
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new InstructionInfo1 { Type = 10, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_I_Un },
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new InstructionInfo1 { Type = 11, Second = true, Third = true, OpCode = OpCodes.Conv_Ovf_U_Un },
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new InstructionInfo1 { Type = 12, Second = true, Third = true, OpCode = OpCodes.Conv_R_Un },
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};
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static Instruction convert_read(BinaryReader reader) {
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byte type = reader.ReadByte();
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bool second = reader.ReadBoolean();
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bool third = reader.ReadBoolean();
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Instruction instr = null;
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foreach (var info in instructionInfos1) {
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if (type != info.Type || info.Second != second || info.Third != third)
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continue;
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instr = new Instruction { OpCode = info.OpCode };
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break;
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}
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if (instr == null)
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throw new ApplicationException("Invalid opcode");
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return instr;
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}
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static Instruction dup_read(BinaryReader reader) {
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switch (reader.ReadByte()) {
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case 0: return Instruction.Create(OpCodes.Dup);
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case 1: return Instruction.Create(OpCodes.Pop);
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default: throw new ApplicationException("Invalid opcode");
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}
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}
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class InstructionInfo2 {
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public bool First { get; set; }
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public bool Second { get; set; }
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public int Value { get; set; }
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public OpCode OpCode { get; set; }
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}
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static List<InstructionInfo2> instructionInfos2 = new List<InstructionInfo2> {
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new InstructionInfo2 { First = false, Second = true, Value = 24, OpCode = OpCodes.Stelem_I },
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new InstructionInfo2 { First = false, Second = true, Value = 4, OpCode = OpCodes.Stelem_I1 },
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new InstructionInfo2 { First = false, Second = true, Value = 6, OpCode = OpCodes.Stelem_I2 },
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new InstructionInfo2 { First = false, Second = true, Value = 8, OpCode = OpCodes.Stelem_I4 },
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new InstructionInfo2 { First = false, Second = true, Value = 10, OpCode = OpCodes.Stelem_I8 },
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new InstructionInfo2 { First = false, Second = true, Value = 12, OpCode = OpCodes.Stelem_R4 },
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new InstructionInfo2 { First = false, Second = true, Value = 13, OpCode = OpCodes.Stelem_R8 },
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new InstructionInfo2 { First = false, Second = true, Value = 28, OpCode = OpCodes.Stelem_Ref },
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new InstructionInfo2 { First = false, Second = false, Value = 0, OpCode = OpCodes.Stelem },
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new InstructionInfo2 { First = true, Second = true, Value = 24, OpCode = OpCodes.Ldelem_I },
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new InstructionInfo2 { First = true, Second = true, Value = 4, OpCode = OpCodes.Ldelem_I1 },
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new InstructionInfo2 { First = true, Second = true, Value = 6, OpCode = OpCodes.Ldelem_I2 },
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new InstructionInfo2 { First = true, Second = true, Value = 8, OpCode = OpCodes.Ldelem_I4 },
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new InstructionInfo2 { First = true, Second = true, Value = 10, OpCode = OpCodes.Ldelem_I8 },
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new InstructionInfo2 { First = true, Second = true, Value = 5, OpCode = OpCodes.Ldelem_U1 },
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new InstructionInfo2 { First = true, Second = true, Value = 7, OpCode = OpCodes.Ldelem_U2 },
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new InstructionInfo2 { First = true, Second = true, Value = 9, OpCode = OpCodes.Ldelem_U4 },
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new InstructionInfo2 { First = true, Second = true, Value = 12, OpCode = OpCodes.Ldelem_R4 },
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new InstructionInfo2 { First = true, Second = true, Value = 13, OpCode = OpCodes.Ldelem_R8 },
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new InstructionInfo2 { First = true, Second = true, Value = 28, OpCode = OpCodes.Ldelem_Ref },
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new InstructionInfo2 { First = true, Second = false, Value = 0, OpCode = OpCodes.Ldelem },
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};
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static Instruction ldelem_read(BinaryReader reader) {
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Instruction instr = null;
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bool first = reader.ReadBoolean();
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bool second = reader.ReadBoolean();
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int value = reader.ReadInt32();
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foreach (var info in instructionInfos2) {
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if (info.First != first || info.Second != second)
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continue;
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if (second && value != info.Value)
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continue;
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if (second)
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instr = new Instruction { OpCode = info.OpCode };
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else
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instr = new Instruction { OpCode = info.OpCode, Operand = new TokenOperand(value) };
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break;
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}
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if (instr == null)
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throw new ApplicationException("Invalid opcode");
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return instr;
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}
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static bool endfinally_check(UnknownHandlerInfo info) {
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return DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MethodInfo System.Type::GetMethod(System.String,System.Reflection.BindingFlags)");
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}
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static Instruction endfinally_read(BinaryReader reader) {
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return Instruction.Create(OpCodes.Endfinally);
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}
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static Instruction ldfld_read(BinaryReader reader) {
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var instr = new Instruction();
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switch (reader.ReadByte()) {
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case 0: instr.Operand = new LoadFieldOperand(reader.ReadInt32()); break;
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case 1: instr.Operand = new LoadFieldAddressOperand(reader.ReadInt32()); break;
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case 2: instr.Operand = new StoreFieldOperand(reader.ReadInt32()); break;
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default: throw new ApplicationException("Invalid opcode");
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}
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return instr;
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}
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static Instruction initobj_read(BinaryReader reader) {
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return new Instruction {
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OpCode = OpCodes.Initobj,
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Operand = new TokenOperand(reader.ReadInt32()),
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};
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}
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static Instruction ldloc_read(BinaryReader reader) {
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bool isLdarg = reader.ReadBoolean();
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ushort index = reader.ReadUInt16();
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var instr = new Instruction();
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if (isLdarg) {
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instr.OpCode = OpCodes.Ldarg;
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instr.Operand = new ArgOperand(index);
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}
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else {
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instr.OpCode = OpCodes.Ldloc;
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instr.Operand = new LocalOperand(index);
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}
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return instr;
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}
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static Instruction ldloca_read(BinaryReader reader) {
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Instruction instr = new Instruction();
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if (reader.ReadBoolean()) {
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instr.OpCode = OpCodes.Ldarga;
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instr.Operand = new ArgOperand(reader.ReadUInt16());
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}
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else {
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instr.OpCode = OpCodes.Ldloca;
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instr.Operand = new LocalOperand(reader.ReadUInt16());
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}
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return instr;
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}
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static Instruction ldelema_read(BinaryReader reader) {
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return new Instruction {
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OpCode = OpCodes.Ldelema,
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Operand = null,
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};
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}
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static Instruction ldlen_read(BinaryReader reader) {
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return Instruction.Create(OpCodes.Ldlen);
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}
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static Instruction ldobj_read(BinaryReader reader) {
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return new Instruction {
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OpCode = OpCodes.Ldobj,
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Operand = null,
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};
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}
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static Instruction ldstr_read(BinaryReader reader) {
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return Instruction.Create(OpCodes.Ldstr, reader.ReadString());
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}
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static bool ldtoken_check(UnknownHandlerInfo info) {
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return DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MemberInfo System.Reflection.Module::ResolveMember(System.Int32)");
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}
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static Instruction ldtoken_read(BinaryReader reader) {
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return new Instruction {
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OpCode = OpCodes.Ldtoken,
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Operand = new TokenOperand(reader.ReadInt32()),
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};
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}
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static bool leave_check(UnknownHandlerInfo info) {
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return !DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MethodBase System.Reflection.Module::ResolveMethod(System.Int32)") &&
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!DotNetUtils.callsMethod(info.ExecuteMethod, "System.Type System.Reflection.Module::ResolveType(System.Int32)") &&
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!DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MemberInfo System.Reflection.Module::ResolveMember(System.Int32)");
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}
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static Instruction leave_read(BinaryReader reader) {
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int displacement = reader.ReadInt32();
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return new Instruction {
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OpCode = OpCodes.Leave,
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Operand = new TargetDisplOperand(displacement),
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};
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}
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static Instruction ldc_read(BinaryReader reader) {
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switch ((ElementType)reader.ReadByte()) {
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case ElementType.I4: return Instruction.CreateLdcI4(reader.ReadInt32());
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case ElementType.I8: return Instruction.Create(OpCodes.Ldc_I8, reader.ReadInt64());
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case ElementType.R4: return Instruction.Create(OpCodes.Ldc_R4, reader.ReadSingle());
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case ElementType.R8: return Instruction.Create(OpCodes.Ldc_R8, reader.ReadDouble());
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case ElementType.Object: return Instruction.Create(OpCodes.Ldnull);
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default: throw new ApplicationException("Invalid opcode");
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}
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}
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static Instruction ldftn_read(BinaryReader reader) {
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byte code = reader.ReadByte();
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int token = reader.ReadInt32();
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Instruction instr;
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switch (code) {
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case 0:
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instr = new Instruction { OpCode = OpCodes.Ldftn, Operand = new TokenOperand(token) };
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break;
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case 1:
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reader.ReadInt32(); // token of newobj .ctor
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instr = new Instruction { OpCode = OpCodes.Ldvirtftn, Operand = new TokenOperand(token) };
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break;
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default:
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throw new ApplicationException("Invalid opcode");
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}
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return instr;
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}
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static Instruction logical_read(BinaryReader reader) {
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switch (reader.ReadByte()) {
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case 0: return Instruction.Create(OpCodes.And);
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case 1: return Instruction.Create(OpCodes.Or);
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case 2: return Instruction.Create(OpCodes.Xor);
|
|
case 3: return Instruction.Create(OpCodes.Shl);
|
|
case 4: return Instruction.Create(OpCodes.Shr);
|
|
case 5: return Instruction.Create(OpCodes.Shr_Un);
|
|
default: throw new ApplicationException("Invalid opcode");
|
|
}
|
|
}
|
|
|
|
static bool nop_check(UnknownHandlerInfo info) {
|
|
return isEmptyMethod(info.ReadMethod) && isEmptyMethod(info.ExecuteMethod);
|
|
}
|
|
|
|
static bool isEmptyMethod(MethodDef method) {
|
|
foreach (var instr in method.Body.Instructions) {
|
|
if (instr.OpCode.Code == Code.Ret)
|
|
return true;
|
|
if (instr.OpCode.Code != Code.Nop)
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static Instruction nop_read(BinaryReader reader) {
|
|
return Instruction.Create(OpCodes.Nop);
|
|
}
|
|
|
|
static bool ret_check(UnknownHandlerInfo info) {
|
|
return DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MethodBase System.Reflection.Module::ResolveMethod(System.Int32)");
|
|
}
|
|
|
|
static Instruction ret_read(BinaryReader reader) {
|
|
reader.ReadInt32(); // token of current method
|
|
return Instruction.Create(OpCodes.Ret);
|
|
}
|
|
|
|
static bool rethrow_check(UnknownHandlerInfo info) {
|
|
return info.ExecuteMethod.Body.Variables.Count == 0;
|
|
}
|
|
|
|
static Instruction rethrow_read(BinaryReader reader) {
|
|
return Instruction.Create(OpCodes.Rethrow);
|
|
}
|
|
|
|
static Instruction stloc_read(BinaryReader reader) {
|
|
bool isStarg = reader.ReadBoolean();
|
|
ushort index = reader.ReadUInt16();
|
|
|
|
var instr = new Instruction();
|
|
if (isStarg) {
|
|
instr.OpCode = OpCodes.Starg;
|
|
instr.Operand = new ArgOperand(index);
|
|
}
|
|
else {
|
|
instr.OpCode = OpCodes.Stloc;
|
|
instr.Operand = new LocalOperand(index);
|
|
reader.ReadInt32(); // ElementType of local
|
|
}
|
|
|
|
return instr;
|
|
}
|
|
|
|
static Instruction stobj_read(BinaryReader reader) {
|
|
return new Instruction {
|
|
OpCode = OpCodes.Stobj,
|
|
Operand = null,
|
|
};
|
|
}
|
|
|
|
static Instruction switch_read(BinaryReader reader) {
|
|
int numTargets = reader.ReadInt32();
|
|
int[] targetDispls = new int[numTargets];
|
|
for (int i = 0; i < targetDispls.Length; i++)
|
|
targetDispls[i] = reader.ReadInt32();
|
|
return new Instruction {
|
|
OpCode = OpCodes.Switch,
|
|
Operand = new SwitchTargetDisplOperand(targetDispls),
|
|
};
|
|
}
|
|
|
|
static bool throw_check(UnknownHandlerInfo info) {
|
|
return !DotNetUtils.callsMethod(info.ExecuteMethod, "System.Reflection.MethodInfo System.Type::GetMethod(System.String,System.Reflection.BindingFlags)");
|
|
}
|
|
|
|
static Instruction throw_read(BinaryReader reader) {
|
|
return Instruction.Create(OpCodes.Throw);
|
|
}
|
|
|
|
static Instruction neg_read(BinaryReader reader) {
|
|
switch (reader.ReadByte()) {
|
|
case 0: return Instruction.Create(OpCodes.Neg);
|
|
case 1: return Instruction.Create(OpCodes.Not);
|
|
default: throw new ApplicationException("Invalid opcode");
|
|
}
|
|
}
|
|
}
|
|
}
|