e0a2e805d4
ConfuserEx changes: * Implement Proxy Call Fixer * Refactor Control Flow Fixer Disable main exception handler to let de4dot throw on error
615 lines
25 KiB
C#
615 lines
25 KiB
C#
using de4dot.blocks;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Text;
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using de4dot.blocks.cflow;
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using de4dot.code.deobfuscators.ConfuserEx.x86;
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namespace de4dot.code.deobfuscators.ConfuserEx
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{
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public class ConstantDecrypterBase
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{
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private X86Method _nativeMethod;
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private readonly InstructionEmulator _instructionEmulator = new InstructionEmulator();
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private int? CalculateKey()
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{
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var popValue = _instructionEmulator.Peek();
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if (popValue == null || !popValue.IsInt32() || !(popValue as Int32Value).AllBitsValid())
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return null;
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_instructionEmulator.Pop();
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int result = _nativeMethod.Execute(((Int32Value)popValue).Value);
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return result;
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}
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public MethodDef Method { get; set; }
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public MethodDef NativeMethod { get; set; }
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public byte[] Decrypted { get; set; }
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public uint Magic1 { get; set; }
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public uint Magic2 { get; set; }
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public bool CanRemove { get; set; } = true;
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private uint CalculateMagic(uint index)
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{
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_instructionEmulator.Push(new Int32Value((int)index));
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_nativeMethod = new X86Method(NativeMethod, Method.Module as ModuleDefMD); //TODO: Possible null
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int? key = CalculateKey();
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uint uint_0 = (uint) key.Value;
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uint_0 &= 0x3fffffff;
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uint_0 <<= 2;
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return uint_0;
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}
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public string DecryptString(uint index)
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{
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index = CalculateMagic(index);
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int count = BitConverter.ToInt32(Decrypted, (int)index);
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return string.Intern(Encoding.UTF8.GetString(Decrypted, (int)index + 4, count));
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}
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public T DecryptConstant<T>(uint index)
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{
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index = CalculateMagic(index);
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T[] array = new T[1];
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Buffer.BlockCopy(Decrypted, (int)index, array, 0, Marshal.SizeOf(typeof(T)));
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return array[0];
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}
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public byte[] DecryptArray(uint index)
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{
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index = CalculateMagic(index);
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int count = BitConverter.ToInt32(Decrypted, (int)index);
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//int lengt = BitConverter.ToInt32(Decrypted, (int)index+4); we actualy dont need that
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byte[] buffer = new byte[count - 4];
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Buffer.BlockCopy(Decrypted, (int)index + 8, buffer, 0, count - 4);
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return buffer;
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}
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}
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public class ConstantsDecrypter
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{
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TypeDef arrayType;
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MethodDef constantsDecInitMethod;
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FieldDef decryptedField, arrayField;
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List<ConstantDecrypterBase> constantDecrpers = new List<ConstantDecrypterBase>();
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byte[] decryptedBytes;
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bool canRemoveLzma = true;
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public bool CanRemoveLzma
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{
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get { return canRemoveLzma; }
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}
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public TypeDef Type
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{
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get { return arrayType; }
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}
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public MethodDef Method
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{
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get { return constantsDecInitMethod; }
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}
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public List<FieldDef> Fields
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{
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get { return new List<FieldDef>() { decryptedField, arrayField }; }
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}
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public List<ConstantDecrypterBase> Decrypters
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{
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get { return constantDecrpers; }
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}
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public bool Detected
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{
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get { return constantsDecInitMethod != null && decryptedBytes != null && constantDecrpers.Count != 0 && decryptedField != null && arrayField != null; }
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}
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ModuleDef module;
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MethodDef lzmaMethod;
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ISimpleDeobfuscator deobfuscator;
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public ConstantsDecrypter(ModuleDef module, MethodDef lzmaMethod, ISimpleDeobfuscator deobfsucator)
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{
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this.module = module;
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this.lzmaMethod = lzmaMethod;
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this.deobfuscator = deobfsucator;
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}
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public void Find()
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{
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var moduleCctor = DotNetUtils.GetModuleTypeCctor(module);
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if (moduleCctor == null)
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return;
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foreach (var inst in moduleCctor.Body.Instructions)
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{
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if (inst.OpCode != OpCodes.Call)
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continue;
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if (!(inst.Operand is MethodDef))
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continue;
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var method = inst.Operand as MethodDef;
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if (!method.HasBody || !method.IsStatic)
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continue;
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if (!DotNetUtils.IsMethod(method, "System.Void", "()"))
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continue;
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deobfuscator.Deobfuscate(method, SimpleDeobfuscatorFlags.Force);
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if (!isStrDecryptInit(method))
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continue;
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constantsDecInitMethod = method;
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FindStringDecrypters(moduleCctor.DeclaringType);
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}
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}
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bool isStrDecryptInit(MethodDef method)
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{
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var instructions = method.Body.Instructions;
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if (instructions.Count < 15)
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return false;
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if (!instructions[0].IsLdcI4())
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return false;
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if (!instructions[1].IsStloc()) //uint num = 96u;
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return false;
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if (!instructions[2].IsLdcI4())
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return false;
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if (instructions[0].GetLdcI4Value() != instructions[2].GetLdcI4Value())
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return false;
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if (instructions[3].OpCode != OpCodes.Newarr)
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return false;
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if (instructions[3].Operand.ToString() != "System.UInt32")
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return false;
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if (instructions[4].OpCode != OpCodes.Dup)
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return false;
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if (instructions[5].OpCode != OpCodes.Ldtoken)
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return false;
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var aField = instructions[5].Operand as FieldDef;
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if (aField == null)
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return false;
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if (aField.InitialValue == null)
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return false;
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if (aField.Attributes != (FieldAttributes.Assembly | FieldAttributes.Static | FieldAttributes.HasFieldRVA))
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return false;
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if (instructions[6].OpCode != OpCodes.Call)
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return false;
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if (instructions[6].Operand.ToString() != "System.Void System.Runtime.CompilerServices.RuntimeHelpers::InitializeArray(System.Array,System.RuntimeFieldHandle)")
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return false;
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if (!instructions[7].IsStloc()) // uint[] array = new uint[] {.....};
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return false;
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var l = instructions.Count;
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if (!instructions[l - 4].IsLdloc())
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return false;
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if (instructions[l - 3].OpCode != OpCodes.Call)
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return false;
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if (instructions[l - 3].Operand != lzmaMethod)
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return false;
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if (instructions[l - 2].OpCode != OpCodes.Stsfld) //<Module>.byte_0 = <Module>.smethod_0(array4);
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return false;
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var dField = instructions[l - 2].Operand as FieldDef;
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if (dField == null)
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return false;
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try
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{
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DecryptArray(ConvertArray<uint, byte>(aField.InitialValue));
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}
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catch (Exception e) { Console.WriteLine(e.Message); canRemoveLzma = false; return false; }
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arrayField = aField;
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arrayType = DotNetUtils.GetType(module, aField.FieldSig.Type);
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decryptedField = dField;
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return true;
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}
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private T[] ConvertArray<T, T1>(T1[] array)
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{
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int l = Marshal.SizeOf(typeof(T));
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int l1 = Marshal.SizeOf(typeof(T1));
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var buffer = new T[(array.Length * l1) / l];
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Buffer.BlockCopy(array, 0, buffer, 0, array.Length * l1);
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return buffer;
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}
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private void DecryptArray(uint[] array) //TODO: Automatic detection
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{
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uint num = 960u; // array size?
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uint[] array2 = new uint[16];
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uint num2 = 4136251032u;
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for (int i = 0; i < 16; i++)
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{
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num2 ^= num2 >> 12;
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num2 ^= num2 << 25;
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num2 ^= num2 >> 27;
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array2[i] = num2;
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}
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int num3 = 0;
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int num4 = 0;
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uint[] array3 = new uint[16];
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byte[] array4 = new byte[num * 4u];
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while ((long)num3 < (long)((ulong)num))
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{
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for (int j = 0; j < 16; j++)
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{
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array3[j] = array[num3 + j];
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}
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uint num5 = array3[3] * 41u;
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array3[11] = (array3[11] ^ 3634844963u);
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uint num6 = array3[3] * 31u;
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num6 += array3[9] * 47u;
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num5 += array3[9] * 85u;
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num5 += array3[10] * 149u;
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uint num7 = array3[3] << 1;
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num7 += array3[3];
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uint num8 = array3[3] << 1;
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num8 += array3[3] << 3;
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num7 += array3[9] << 3;
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num8 += array3[9] * 13u;
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num7 += array3[9];
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num6 += array3[10] * 71u;
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num7 += array3[10] << 1;
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num6 += array3[1] * 81u;
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array3[4] = (array3[4] ^ ~array3[6]);
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num8 += array3[10] << 1;
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num7 += array3[10] << 4;
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array3[9] = num6;
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num8 += array3[10] << 4;
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array3[6] = array3[6] * 395315459u;
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num8 += array3[1] * 19u;
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num7 += array3[1] * 23u;
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num5 += array3[1] * 184u;
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num6 = array3[7] * 19u;
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array3[10] = num7;
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num6 += array3[8] * 28u;
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array3[14] = (array3[14] ^ array3[0]);
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array3[3] = num8;
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num6 += array3[12] << 6;
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array3[1] = num5;
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array3[2] = (array3[2] ^ array2[2]);
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num5 = array3[7] * 28u;
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num5 += array3[8] << 2;
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num8 = array3[7] << 1;
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num7 = array3[7] << 5;
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num8 += array3[7] << 3;
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num8 += array3[8] * 13u;
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num7 += array3[7];
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num6 += array3[12];
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num7 += array3[8] * 42u;
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array3[4] = array3[4] - array3[10];
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num8 += array3[12] << 5;
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num6 += array3[15] * 85u;
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num5 += array3[8] << 5;
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array3[7] = num6;
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array3[11] = array3[11] - 2867139633u;
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num7 += array3[12] * 108u;
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num5 += array3[12] * 93u;
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num8 += array3[12];
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num5 += array3[15] * 141u;
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num8 += array3[15] * 49u;
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num7 += array3[15] * 163u;
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array3[12] = num5;
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array3[15] = num7;
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array3[8] = num8;
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num5 = array3[7] >> 21;
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num6 = array3[15] >> 22;
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array3[15] = array3[15] << 10;
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num8 = array3[1] >> 21;
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array3[15] = (array3[15] | num6);
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array3[12] = (array3[12] ^ array2[12]);
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num6 = (array3[2] & 3262151220u);
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array3[1] = array3[1] << 11;
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array3[1] = (array3[1] | num8);
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array3[7] = array3[7] << 11;
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array3[0] = array3[0] - array3[14];
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num7 = array3[13] << 4;
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num8 = array3[3] * 954284655u;
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array3[3] = array3[5];
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array3[5] = num8 * 3102958735u;
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array3[7] = (array3[7] | num5);
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num5 = array3[10] << 4;
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num8 = array3[9] * 2468501497u;
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array3[2] = (array3[2] & 1032816075u);
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array3[13] = array3[13] >> 28;
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array3[13] = (array3[13] | num7);
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array3[7] = array3[7] - 888060325u;
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array3[2] = (array3[2] | (array3[8] & 3262151220u));
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array3[12] = array3[12] * 4056148675u;
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array3[9] = array3[13];
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num7 = array3[6] << 5;
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array3[13] = num8 * 1746582089u;
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array3[6] = array3[6] >> 27;
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array3[6] = (array3[6] | num7);
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array3[8] = (array3[8] & 1032816075u);
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array3[7] = (array3[7] ^ array2[7]);
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num5 += array3[11] * 46u;
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num6 *= 869722291u;
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num8 = array3[10] << 1;
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num5 += array3[3] * 92u;
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num5 += array3[5] * 149u;
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array3[7] = array3[7] - 3922202313u;
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array3[8] = (array3[8] | num6 * 2576221819u);
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num8 += array3[11] * 15u;
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num8 += array3[3] * 37u;
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num6 = array3[10] * 7u;
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array3[8] = (array3[8] ^ 1878284212u);
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num8 += array3[5] * 56u;
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array3[9] = (array3[9] ^ array2[9]);
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num7 = array3[10] << 3;
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array3[6] = (array3[6] ^ 2841119440u);
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num6 += array3[11] << 4;
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array3[2] = (array3[2] ^ 217219923u);
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num7 += array3[10];
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num6 += array3[3] * 29u;
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array3[6] = (array3[6] ^ array2[6]);
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num7 += array3[11] * 26u;
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num7 += array3[3] * 52u;
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num6 += array3[5] * 49u;
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num7 += array3[5] * 84u;
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array3[3] = num5;
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array3[10] = num6;
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num6 = array3[1] * 15u;
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array3[12] = (array3[12] ^ 1080861703u);
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array3[5] = num8;
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num5 = (array3[4] & 3659960635u);
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num6 += array3[12] << 1;
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array3[4] = (array3[4] & 635006660u);
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array3[4] = (array3[4] | (array3[9] & 3659960635u));
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num5 *= 1676034815u;
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array3[11] = num7;
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num7 = array3[1] * 19u;
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num6 += array3[12] << 4;
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array3[9] = (array3[9] & 635006660u);
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num6 += array3[3] << 6;
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num7 += array3[12] * 27u;
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array3[5] = array3[5] - array3[8];
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array3[9] = (array3[9] | num5 * 1267776767u);
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num5 = array3[1] << 2;
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num5 += array3[1];
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array3[13] = (array3[13] ^ array2[13]);
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num8 = array3[1];
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num6 += array3[3];
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num5 += array3[12] << 3;
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num8 += array3[12] << 1;
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num8 += array3[12];
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num6 += array3[15] * 22u;
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num5 += array3[3] * 27u;
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num5 += array3[15] << 3;
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num7 += array3[3] * 92u;
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num8 += array3[3] << 3;
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num8 += array3[3];
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num5 += array3[15];
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num8 += array3[15] << 1;
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num8 += array3[15];
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array3[3] = num6;
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array3[0] = (array3[0] ^ array3[13]);
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array3[14] = array3[14] - array3[15];
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num7 += array3[15] << 5;
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array3[13] = (array3[13] ^ ~array3[1]);
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num6 = array3[10] >> 31;
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array3[14] = (array3[14] ^ array2[14]);
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array3[8] = (array3[8] ^ array2[8]);
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array3[12] = num5;
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array3[1] = num8;
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array3[5] = (array3[5] ^ array2[5]);
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array3[11] = (array3[11] ^ array2[11]);
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num5 = (array3[11] & 2204625944u);
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array3[1] = (array3[1] ^ array2[1]);
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array3[4] = (array3[4] ^ array2[4]);
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array3[11] = (array3[11] & 2090341351u);
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array3[11] = (array3[11] | (array3[4] & 2204625944u));
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array3[15] = num7;
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num8 = (array3[14] & 2496954112u);
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array3[14] = (array3[14] & 1798013183u);
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array3[4] = (array3[4] & 2090341351u);
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array3[15] = (array3[15] ^ array2[15]);
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array3[10] = array3[10] << 1;
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num5 *= 338764649u;
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array3[14] = (array3[14] | (array3[9] & 2496954112u));
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array3[15] = array3[15] - array3[0];
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array3[10] = (array3[10] | num6);
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array3[10] = (array3[10] ^ array2[10]);
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array3[3] = (array3[3] ^ array2[3]);
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num8 *= 2292397853u;
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array3[0] = (array3[0] ^ array2[0]);
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array3[0] = (array3[0] ^ 2814140307u);
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array3[2] = (array3[2] ^ ~array3[13]);
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array3[4] = (array3[4] | num5 * 587046105u);
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array3[9] = (array3[9] & 1798013183u);
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array3[9] = (array3[9] | num8 * 1520255797u);
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for (int k = 0; k < 16; k++)
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{
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uint num9 = array3[k];
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array4[num4++] = (byte)num9;
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array4[num4++] = (byte)(num9 >> 8);
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array4[num4++] = (byte)(num9 >> 16);
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array4[num4++] = (byte)(num9 >> 24);
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array2[k] ^= num9;
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}
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num3 += 16;
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}
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decryptedBytes = Lzma.Decompress(array4);
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}
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private void FindStringDecrypters(TypeDef type)
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{
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foreach (var method in type.Methods)
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{
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if (!method.HasBody)
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continue;
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if (!(method.Signature.ContainsGenericParameter))
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continue;
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var sig = method.MethodSig;
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if (sig == null)
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continue;
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if (sig.Params.Count != 1)
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continue;
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if (sig.Params[0].GetElementType() != ElementType.U4)
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continue;
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|
if (!(sig.RetType.RemovePinnedAndModifiers() is GenericMVar))
|
|
continue;
|
|
if (sig.GenParamCount != 1)
|
|
continue;
|
|
deobfuscator.Deobfuscate(method, SimpleDeobfuscatorFlags.Force);
|
|
IsStringDecrypter(method);
|
|
}
|
|
}
|
|
|
|
string[] strDecryptCalledMethods = {
|
|
"System.Text.Encoding System.Text.Encoding::get_UTF8()",
|
|
"System.String System.Text.Encoding::GetString(System.Byte[],System.Int32,System.Int32)",
|
|
"System.Array System.Array::CreateInstance(System.Type,System.Int32)",
|
|
"System.String System.String::Intern(System.String)",
|
|
"System.Void System.Buffer::BlockCopy(System.Array,System.Int32,System.Array,System.Int32,System.Int32)",
|
|
"System.Type System.Type::GetTypeFromHandle(System.RuntimeTypeHandle)",
|
|
"System.Type System.Type::GetElementType()"
|
|
};
|
|
|
|
private void IsStringDecrypter(MethodDef method)
|
|
{
|
|
var instr = method.Body.Instructions;
|
|
if (instr.Count < 25)
|
|
return;
|
|
|
|
int i = 0;
|
|
|
|
if (!instr[i++].IsLdarg())
|
|
return;
|
|
|
|
if (instr[i].OpCode != OpCodes.Call)
|
|
return;
|
|
|
|
var nativeMethod = instr[i++].Operand as MethodDef;
|
|
|
|
if (nativeMethod == null || !nativeMethod.IsStatic || !nativeMethod.IsNative)
|
|
return;
|
|
if (!DotNetUtils.IsMethod(nativeMethod, "System.Int32", "(System.Int32)"))
|
|
return;
|
|
|
|
if (!instr[i++].IsStarg()) //uint_0 = (uint_0 * 2857448701u ^ 1196001109u);
|
|
return;
|
|
|
|
if (!instr[i++].IsLdarg())
|
|
return;
|
|
if (!instr[i].IsLdcI4() || instr[i++].GetLdcI4Value() != 0x1E)
|
|
return;
|
|
if (instr[i++].OpCode != OpCodes.Shr_Un)
|
|
return;
|
|
if (!instr[i++].IsStloc()) //uint num = uint_0 >> 30;
|
|
return;
|
|
i++;
|
|
//TODO: Implement
|
|
//if (!instr[10].IsLdloca())
|
|
// return;
|
|
if (instr[i++].OpCode != OpCodes.Initobj)
|
|
return;
|
|
if (!instr[i++].IsLdarg())
|
|
return;
|
|
if (!instr[i].IsLdcI4() || instr[i++].GetLdcI4Value() != 0x3FFFFFFF)
|
|
return;
|
|
if (instr[i++].OpCode != OpCodes.And)
|
|
return;
|
|
if (!instr[i++].IsStarg()) //uint_0 &= 1073741823u;
|
|
return;
|
|
|
|
if (!instr[i++].IsLdarg())
|
|
return;
|
|
if (!instr[i].IsLdcI4() || instr[i++].GetLdcI4Value() != 2)
|
|
return;
|
|
if (instr[i++].OpCode != OpCodes.Shl)
|
|
return;
|
|
if (!instr[i++].IsStarg()) //uint_0 <<= 2;
|
|
return;
|
|
|
|
foreach (var mtd in strDecryptCalledMethods)
|
|
if (!DotNetUtils.CallsMethod(method, mtd))
|
|
return;
|
|
//TODO: Implement
|
|
//if (!DotNetUtils.LoadsField(method, decryptedField))
|
|
// return;
|
|
constantDecrpers.Add(new ConstantDecrypterBase()
|
|
{
|
|
Decrypted = decryptedBytes,
|
|
Method = method,
|
|
NativeMethod = nativeMethod,
|
|
});
|
|
}
|
|
|
|
static bool VerifyGenericArg(MethodSpec gim, ElementType etype)
|
|
{
|
|
if (gim == null)
|
|
return false;
|
|
var gims = gim.GenericInstMethodSig;
|
|
if (gims == null || gims.GenericArguments.Count != 1)
|
|
return false;
|
|
return gims.GenericArguments[0].GetElementType() == etype;
|
|
}
|
|
public string DecryptString(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.String))
|
|
return null;
|
|
return info.DecryptString(magic1);
|
|
}
|
|
public object DecryptSByte(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.I1))
|
|
return null;
|
|
return info.DecryptConstant<sbyte>(magic1);
|
|
}
|
|
public object DecryptByte(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.U1))
|
|
return null;
|
|
return info.DecryptConstant<byte>(magic1);
|
|
}
|
|
public object DecryptInt16(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.I2))
|
|
return null;
|
|
return info.DecryptConstant<short>(magic1);
|
|
}
|
|
public object DecryptUInt16(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.U2))
|
|
return null;
|
|
return info.DecryptConstant<ushort>(magic1);
|
|
}
|
|
public object DecryptInt32(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.I4))
|
|
return null;
|
|
return info.DecryptConstant<int>(magic1);
|
|
}
|
|
public object DecryptUInt32(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.U4))
|
|
return null;
|
|
return info.DecryptConstant<uint>(magic1);
|
|
}
|
|
public object DecryptInt64(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.I8))
|
|
return null;
|
|
return info.DecryptConstant<long>(magic1);
|
|
}
|
|
public object DecryptUInt64(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.U8))
|
|
return null;
|
|
return info.DecryptConstant<ulong>(magic1);
|
|
}
|
|
public object DecryptSingle(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.R4))
|
|
return null;
|
|
return info.DecryptConstant<float>(magic1);
|
|
}
|
|
public object DecryptDouble(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.R8))
|
|
return null;
|
|
return info.DecryptConstant<double>(magic1);
|
|
}
|
|
public object DecryptArray(ConstantDecrypterBase info, MethodSpec gim, uint magic1)
|
|
{
|
|
if (!VerifyGenericArg(gim, ElementType.SZArray))
|
|
return null;
|
|
return info.DecryptArray(magic1);
|
|
}
|
|
}
|
|
} |