289 lines
9.0 KiB
C#
289 lines
9.0 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 Mono.Cecil;
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using Mono.MyStuff;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.CodeVeil {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "CodeVeil";
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public const string THE_TYPE = "cv";
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const string DEFAULT_REGEX = @"!^[A-Za-z]{1,2}$&" + DeobfuscatorBase.DEFAULT_VALID_NAME_REGEX;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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}
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public override string Name {
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get { return THE_NAME; }
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}
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public override string Type {
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get { return THE_TYPE; }
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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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});
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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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};
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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 = DeobfuscatorInfo.THE_NAME;
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MainType mainType;
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MethodsDecrypter methodsDecrypter;
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ProxyDelegateFinder proxyDelegateFinder;
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StringDecrypter stringDecrypter;
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AssemblyResolver assemblyResolver;
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TypeDefinition killType;
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ResourceDecrypter resourceDecrypter;
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internal class Options : OptionsBase {
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}
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public override string Type {
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get { return DeobfuscatorInfo.THE_TYPE; }
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}
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public override string TypeLong {
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get { return DeobfuscatorInfo.THE_NAME; }
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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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StringFeatures = StringFeatures.AllowStaticDecryption | StringFeatures.AllowDynamicDecryption;
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}
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protected override int detectInternal() {
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int val = 0;
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int sum = toInt32(mainType.Detected) +
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toInt32(methodsDecrypter.Detected) +
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toInt32(stringDecrypter.Detected) +
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toInt32(proxyDelegateFinder.Detected);
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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if (killType != null)
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val += 10;
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return val;
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}
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protected override void scanForObfuscator() {
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findKillType();
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mainType = new MainType(module);
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mainType.find();
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proxyDelegateFinder = new ProxyDelegateFinder(module, mainType);
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proxyDelegateFinder.findDelegateCreator();
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methodsDecrypter = new MethodsDecrypter(mainType);
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methodsDecrypter.find();
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stringDecrypter = new StringDecrypter(module, mainType);
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stringDecrypter.find();
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var version = detectVersion();
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if (!string.IsNullOrEmpty(version))
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obfuscatorName = obfuscatorName + " " + version;
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}
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string detectVersion() {
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if (mainType.Detected) {
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switch (mainType.Version) {
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case ObfuscatorVersion.Unknown:
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return null;
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case ObfuscatorVersion.V3:
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return "3.x";
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case ObfuscatorVersion.V4_0:
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return "4.0";
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case ObfuscatorVersion.V4_1:
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return "4.1";
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case ObfuscatorVersion.V5_0:
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return "5.0";
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default:
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throw new ApplicationException("Unknown version");
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}
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}
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return null;
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}
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void findKillType() {
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foreach (var type in module.Types) {
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if (type.FullName == "____KILL") {
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killType = type;
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break;
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}
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}
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}
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public override bool getDecryptedModule(ref byte[] newFileData, ref DumpedMethods dumpedMethods) {
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if (!methodsDecrypter.Detected)
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return false;
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var fileData = DeobUtils.readModule(module);
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if (!methodsDecrypter.decrypt(fileData, 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.mainType = new MainType(module, mainType);
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newOne.methodsDecrypter = new MethodsDecrypter(mainType, methodsDecrypter);
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newOne.stringDecrypter = new StringDecrypter(module, newOne.mainType, stringDecrypter);
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newOne.proxyDelegateFinder = new ProxyDelegateFinder(module, newOne.mainType, proxyDelegateFinder);
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newOne.killType = DeobUtils.lookup(module, killType, "Could not find KILL type");
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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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addTypeToBeRemoved(killType, "KILL type");
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mainType.initialize();
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foreach (var initMethod in mainType.OtherInitMethods) {
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addCctorInitCallToBeRemoved(initMethod);
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addCtorInitCallToBeRemoved(initMethod);
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}
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if (Operations.DecryptStrings != OpDecryptString.None) {
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stringDecrypter.initialize();
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staticStringInliner.add(stringDecrypter.DecryptMethod, (method, args) => {
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return stringDecrypter.decrypt((int)args[0]);
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});
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DeobfuscatedFile.stringDecryptersAdded();
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addModuleCctorInitCallToBeRemoved(stringDecrypter.InitMethod);
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addCallToBeRemoved(mainType.getInitStringDecrypterMethod(stringDecrypter.InitMethod), stringDecrypter.InitMethod);
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}
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assemblyResolver = new AssemblyResolver(module);
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assemblyResolver.initialize();
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dumpEmbeddedAssemblies();
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removeTamperDetection();
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proxyDelegateFinder.initialize();
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proxyDelegateFinder.find();
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resourceDecrypter = new ResourceDecrypter(module);
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resourceDecrypter.initialize();
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resourceDecrypter.decrypt();
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if (resourceDecrypter.CanRemoveTypes) {
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addTypeToBeRemoved(resourceDecrypter.ResourceFlagsType, "Obfuscator ResourceFlags type");
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addTypeToBeRemoved(resourceDecrypter.ResType, "Obfuscator Res type");
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addTypeToBeRemoved(resourceDecrypter.ResourceEnumeratorType, "Obfuscator ResourceEnumerator type");
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addTypeToBeRemoved(resourceDecrypter.EncryptedResourceReaderType, "Obfuscator EncryptedResourceReader type");
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addTypeToBeRemoved(resourceDecrypter.EncryptedResourceSetType, "Obfuscator EncryptedResourceSet type");
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addTypeToBeRemoved(resourceDecrypter.EncryptedResourceStreamType, "Obfuscator EncryptedResourceStream type");
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}
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}
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void removeTamperDetection() {
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var tamperDetection = new TamperDetection(module, mainType);
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tamperDetection.initialize();
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foreach (var tamperDetectionMethod in tamperDetection.Methods)
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addCctorInitCallToBeRemoved(tamperDetectionMethod);
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addTypeToBeRemoved(tamperDetection.Type, "Tamper detection type");
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}
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void dumpEmbeddedAssemblies() {
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foreach (var info in assemblyResolver.AssemblyInfos)
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DeobfuscatedFile.createAssemblyFile(info.data, info.simpleName, info.extension);
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addResourceToBeRemoved(assemblyResolver.BundleDataResource, "Embedded assemblies resource");
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addResourceToBeRemoved(assemblyResolver.BundleXmlFileResource, "Embedded assemblies XML file resource");
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addTypesToBeRemoved(assemblyResolver.BundleTypes, "Obfuscator assembly bundle types");
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}
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public override void deobfuscateMethodBegin(Blocks blocks) {
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proxyDelegateFinder.deobfuscate(blocks);
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base.deobfuscateMethodBegin(blocks);
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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mainType.removeInitCall(blocks);
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resourceDecrypter.deobfuscate(blocks);
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base.deobfuscateMethodEnd(blocks);
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}
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public override void deobfuscateEnd() {
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bool canRemoveProxyTypes = proxyDelegateFinder.CanRemoveTypes;
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if (CanRemoveStringDecrypterType)
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addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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if (!mainType.Detected) {
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}
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else if (mainType.Version >= ObfuscatorVersion.V5_0) {
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if (!proxyDelegateFinder.FoundProxyType || canRemoveProxyTypes)
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addTypeToBeRemoved(mainType.Type, "Main CV type");
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}
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else {
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var type = mainType.Type;
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if (!type.HasNestedTypes && !type.HasProperties && !type.HasEvents && !type.HasFields)
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addTypeToBeRemoved(type, "Main CV type");
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else {
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foreach (var method in type.Methods)
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addMethodToBeRemoved(method, "CV main type method");
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}
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}
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removeProxyDelegates(proxyDelegateFinder, canRemoveProxyTypes);
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if (canRemoveProxyTypes) {
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addTypeToBeRemoved(proxyDelegateFinder.IlGeneratorType, "Obfuscator proxy method ILGenerator type");
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addTypeToBeRemoved(proxyDelegateFinder.FieldInfoType, "Obfuscator proxy method FieldInfo type");
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addTypeToBeRemoved(proxyDelegateFinder.MethodInfoType, "Obfuscator proxy method MethodInfo type");
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}
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addMethodsToBeRemoved(InvalidMethodsFinder.findAll(module), "Anti-reflection method");
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base.deobfuscateEnd();
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}
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public override IEnumerable<int> getStringDecrypterMethods() {
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var list = new List<int>();
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if (stringDecrypter.DecryptMethod != null)
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list.Add(stringDecrypter.DecryptMethod.MetadataToken.ToInt32());
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return list;
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}
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}
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}
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