348 lines
10 KiB
C#
348 lines
10 KiB
C#
/*
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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.IO;
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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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using Mono.MyStuff;
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using de4dot.blocks;
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namespace de4dot.deobfuscators.dotNET_Reactor {
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class DeobfuscatorInfo : DeobfuscatorInfoBase {
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BoolOption decryptMethods;
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BoolOption decryptBools;
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public DeobfuscatorInfo()
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: base("dr") {
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decryptMethods = new BoolOption(null, makeArgName("methods"), "Decrypt methods", true);
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decryptBools = new BoolOption(null, makeArgName("bools"), "Decrypt booleans", true);
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}
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internal static string ObfuscatorType {
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get { return "dotNet_Reactor"; }
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}
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public override string Type {
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get { return ObfuscatorType; }
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}
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public override IDeobfuscator createDeobfuscator() {
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return new Deobfuscator(new Deobfuscator.Options {
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ValidNameRegex = validNameRegex.get(),
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DecryptMethods = decryptMethods.get(),
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DecryptBools = decryptBools.get(),
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});
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}
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protected override IEnumerable<Option> getOptionsInternal() {
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return new List<Option>() {
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decryptMethods,
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decryptBools,
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};
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}
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}
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class Deobfuscator : DeobfuscatorBase {
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Options options;
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string obfuscatorName = ".NET Reactor";
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PE.PeImage peImage;
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byte[] fileData;
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MethodsDecrypter methodsDecrypter;
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StringDecrypter stringDecrypter;
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BooleanDecrypter booleanDecrypter;
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BoolValueInliner boolValueInliner;
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internal class Options : OptionsBase {
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public bool DecryptMethods { get; set; }
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public bool DecryptBools { get; set; }
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}
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public override string Type {
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get { return DeobfuscatorInfo.ObfuscatorType; }
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}
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public override string Name {
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get { return obfuscatorName; }
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}
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public Deobfuscator(Options options)
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: base(options) {
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this.options = options;
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}
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public override void init(ModuleDefinition module) {
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base.init(module);
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}
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protected override int detectInternal() {
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int val = 0;
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if (methodsDecrypter.Detected || stringDecrypter.Detected || booleanDecrypter.Detected)
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val += 100;
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int sum = convert(methodsDecrypter.Detected) +
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convert(stringDecrypter.Detected) +
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convert(booleanDecrypter.Detected);
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if (sum > 1)
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val += 10 * (sum - 1);
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return val;
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}
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static int convert(bool b) {
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return b ? 1 : 0;
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}
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protected override void scanForObfuscator() {
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methodsDecrypter = new MethodsDecrypter(module);
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methodsDecrypter.find();
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find(DeobfuscatedFile);
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booleanDecrypter = new BooleanDecrypter(module);
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booleanDecrypter.find();
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obfuscatorName = detectVersion();
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}
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string detectVersion() {
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/*
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Methods decrypter locals (not showing its own types):
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3.7.0.3:
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"System.Byte[]"
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"System.Int32"
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"System.Int32[]"
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"System.IntPtr"
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"System.IO.BinaryReader"
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"System.IO.MemoryStream"
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"System.Object"
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"System.Reflection.Assembly"
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"System.Security.Cryptography.CryptoStream"
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"System.Security.Cryptography.ICryptoTransform"
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"System.Security.Cryptography.RijndaelManaged"
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"System.String"
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3.9.8.0:
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- "System.Int32[]"
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+ "System.Diagnostics.StackFrame"
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4.0.0.0: (jitter)
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- "System.Diagnostics.StackFrame"
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- "System.Object"
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+ "System.Boolean"
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+ "System.Collections.IEnumerator"
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+ "System.Delegate"
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+ "System.Diagnostics.Process"
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+ "System.Diagnostics.ProcessModule"
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+ "System.Diagnostics.ProcessModuleCollection"
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+ "System.IDisposable"
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+ "System.Int64"
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+ "System.UInt32"
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+ "System.UInt64"
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4.1.0.0: (jitter)
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+ "System.Reflection.Assembly"
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4.3.1.0: (jitter)
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+ "System.Byte&"
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*/
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LocalTypes localTypes;
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int minVer = -1;
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foreach (var info in stringDecrypter.DecrypterInfos) {
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if (info.key == null)
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continue;
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localTypes = new LocalTypes(info.method);
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if (!localTypes.exists("System.IntPtr"))
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return ".NET Reactor <= 3.7";
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minVer = 3800;
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break;
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}
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if (methodsDecrypter.MethodsDecrypterMethod == null) {
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if (minVer >= 3800)
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return ".NET Reactor >= 3.8";
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return ".NET Reactor";
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}
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localTypes = new LocalTypes(methodsDecrypter.MethodsDecrypterMethod);
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if (localTypes.exists("System.Int32[]")) {
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if (minVer >= 3800)
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return ".NET Reactor 3.8.4.1 - 3.9.0.1";
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return ".NET Reactor <= 3.9.0.1";
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}
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if (!localTypes.exists("System.Diagnostics.Process")) { // If < 4.0
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if (localTypes.exists("System.Diagnostics.StackFrame"))
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return ".NET Reactor 3.9.8.0";
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}
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var compileMethod = findDnrCompileMethod(methodsDecrypter.MethodsDecrypterMethod.DeclaringType);
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if (compileMethod == null)
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return ".NET Reactor < 4.0";
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DeobfuscatedFile.deobfuscate(compileMethod);
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bool compileMethodHasConstant_0x70000000 = findConstant(compileMethod, 0x70000000); // 4.0-4.1
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DeobfuscatedFile.deobfuscate(methodsDecrypter.MethodsDecrypterMethod);
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bool hasCorEnableProfilingString = findString(methodsDecrypter.MethodsDecrypterMethod, "Cor_Enable_Profiling"); // 4.1-4.4
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if (compileMethodHasConstant_0x70000000) {
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if (hasCorEnableProfilingString)
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return ".NET Reactor 4.1";
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return ".NET Reactor 4.0";
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}
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if (!hasCorEnableProfilingString)
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return ".NET Reactor";
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// 4.2-4.4
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if (!localTypes.exists("System.Byte&"))
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return ".NET Reactor 4.2";
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localTypes = new LocalTypes(compileMethod);
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if (localTypes.exists("System.Object"))
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return ".NET Reactor 4.4";
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return ".NET Reactor 4.3";
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}
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static bool findString(MethodDefinition method, string s) {
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if (method == null || method.Body == null)
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return false;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Ldstr)
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continue;
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if (s == (string)instr.Operand)
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return true;
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}
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return false;
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}
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static bool findConstant(MethodDefinition method, int constant) {
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if (method == null || method.Body == null)
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return false;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Ldc_I4)
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continue;
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if (constant == (int)instr.Operand)
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return true;
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}
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return false;
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}
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static MethodDefinition findDnrCompileMethod(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (method.Parameters.Count != 6)
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continue;
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if (!DotNetUtils.isMethod(method, "System.UInt32", "(System.UInt64&,System.IntPtr,System.IntPtr,System.UInt32,System.IntPtr&,System.UInt32&)"))
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continue;
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return method;
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}
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return null;
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}
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public override bool getDecryptedModule(ref byte[] newFileData, ref Dictionary<uint, DumpedMethod> dumpedMethods) {
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using (var fileStream = new FileStream(module.FullyQualifiedName, FileMode.Open, FileAccess.Read, FileShare.Read)) {
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fileData = new byte[(int)fileStream.Length];
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fileStream.Read(fileData, 0, fileData.Length);
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}
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peImage = new PE.PeImage(fileData);
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if (!options.DecryptMethods)
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return false;
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if (!methodsDecrypter.decrypt(peImage, DeobfuscatedFile, ref dumpedMethods))
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return false;
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newFileData = fileData;
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return true;
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}
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public override IDeobfuscator moduleReloaded(ModuleDefinition module) {
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var newOne = new Deobfuscator(options);
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newOne.setModule(module);
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newOne.fileData = fileData;
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newOne.peImage = new PE.PeImage(fileData);
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newOne.methodsDecrypter = new MethodsDecrypter(module, methodsDecrypter);
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newOne.stringDecrypter = new StringDecrypter(module, stringDecrypter);
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newOne.booleanDecrypter = new BooleanDecrypter(module, booleanDecrypter);
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return newOne;
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}
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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stringDecrypter.init(peImage, fileData, DeobfuscatedFile);
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booleanDecrypter.init(fileData, DeobfuscatedFile);
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boolValueInliner = new BoolValueInliner();
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if (options.DecryptBools) {
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boolValueInliner.add(booleanDecrypter.BoolDecrypterMethod, (method, args) => {
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return booleanDecrypter.decrypt((int)args[0]);
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});
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}
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foreach (var info in stringDecrypter.DecrypterInfos) {
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staticStringDecrypter.add(info.method, (method2, args) => {
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return stringDecrypter.decrypt(method2, (int)args[0]);
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});
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}
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if (stringDecrypter.OtherStringDecrypter != null) {
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staticStringDecrypter.add(stringDecrypter.OtherStringDecrypter, (method2, args) => {
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return stringDecrypter.decrypt((string)args[0]);
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});
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}
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DeobfuscatedFile.stringDecryptersAdded();
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if (Operations.DecryptStrings != OpDecryptString.None)
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addResourceToBeRemoved(stringDecrypter.StringsResource, "Encrypted strings");
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if (options.DecryptMethods) {
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addResourceToBeRemoved(methodsDecrypter.MethodsResource, "Encrypted methods");
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addCctorInitCallToBeRemoved(methodsDecrypter.MethodsDecrypterMethod);
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}
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if (options.DecryptBools)
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addResourceToBeRemoved(booleanDecrypter.BooleansResource, "Encrypted booleans");
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bool deleteTypes = Operations.DecryptStrings != OpDecryptString.None && options.DecryptMethods && options.DecryptBools;
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if (deleteTypes && methodsDecrypter.MethodsDecrypterMethod != null)
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addTypeToBeRemoved(methodsDecrypter.MethodsDecrypterMethod.DeclaringType, "Decrypter type");
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}
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public override bool deobfuscateOther(Blocks blocks) {
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if (boolValueInliner.HasHandlers)
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return boolValueInliner.decrypt(blocks) > 0;
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return false;
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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base.deobfuscateMethodEnd(blocks);
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}
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public override void deobfuscateEnd() {
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base.deobfuscateEnd();
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}
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public override IEnumerable<string> getStringDecrypterMethods() {
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var list = new List<string>();
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foreach (var info in stringDecrypter.DecrypterInfos)
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list.Add(info.method.MetadataToken.ToInt32().ToString("X8"));
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if (stringDecrypter.OtherStringDecrypter != null)
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list.Add(stringDecrypter.OtherStringDecrypter.MetadataToken.ToInt32().ToString("X8"));
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return list;
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}
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}
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}
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