286 lines
8.9 KiB
C#
286 lines
8.9 KiB
C#
/*
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Copyright (C) 2011-2015 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 dnlib.DotNet;
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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_ASIAN_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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ProxyCallFixer proxyCallFixer;
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StringDecrypter stringDecrypter;
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AssemblyResolver assemblyResolver;
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TypeDef 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(proxyCallFixer.Detected);
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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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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proxyCallFixer = new ProxyCallFixer(module, mainType);
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proxyCallFixer.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(int count, ref byte[] newFileData, ref DumpedMethods dumpedMethods) {
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if (count != 0 || !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(ModuleDefMD 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.proxyCallFixer = new ProxyCallFixer(module, newOne.mainType, proxyCallFixer);
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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, gim, 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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proxyCallFixer.Initialize();
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proxyCallFixer.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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proxyCallFixer.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 = proxyCallFixer.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 (!proxyCallFixer.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(proxyCallFixer, canRemoveProxyTypes);
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if (canRemoveProxyTypes) {
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AddTypeToBeRemoved(proxyCallFixer.IlGeneratorType, "Obfuscator proxy method ILGenerator type");
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AddTypeToBeRemoved(proxyCallFixer.FieldInfoType, "Obfuscator proxy method FieldInfo type");
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AddTypeToBeRemoved(proxyCallFixer.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.MDToken.ToInt32());
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return list;
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}
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}
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}
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