305 lines
10 KiB
C#
305 lines
10 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.Collections.Generic;
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using System.Text.RegularExpressions;
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using dnlib.DotNet;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.Babel_NET {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "Babel .NET";
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public const string THE_TYPE = "bl";
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const string DEFAULT_REGEX = DeobfuscatorBase.DEFAULT_ASIAN_VALID_NAME_REGEX;
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BoolOption inlineMethods;
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BoolOption removeInlinedMethods;
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BoolOption decryptMethods;
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BoolOption decryptResources;
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BoolOption decryptConstants;
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BoolOption dumpEmbeddedAssemblies;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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inlineMethods = new BoolOption(null, MakeArgName("inline"), "Inline short methods", true);
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removeInlinedMethods = new BoolOption(null, MakeArgName("remove-inlined"), "Remove inlined methods", true);
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decryptMethods = new BoolOption(null, MakeArgName("methods"), "Decrypt methods", true);
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decryptResources = new BoolOption(null, MakeArgName("rsrc"), "Decrypt resources", true);
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decryptConstants = new BoolOption(null, MakeArgName("consts"), "Decrypt constants and arrays", true);
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dumpEmbeddedAssemblies = new BoolOption(null, MakeArgName("embedded"), "Dump embedded assemblies", true);
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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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InlineMethods = inlineMethods.Get(),
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RemoveInlinedMethods = removeInlinedMethods.Get(),
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DecryptMethods = decryptMethods.Get(),
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DecryptResources = decryptResources.Get(),
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DecryptConstants = decryptConstants.Get(),
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DumpEmbeddedAssemblies = dumpEmbeddedAssemblies.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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inlineMethods,
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removeInlinedMethods,
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decryptMethods,
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decryptResources,
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decryptConstants,
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dumpEmbeddedAssemblies,
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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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bool foundBabelAttribute = false;
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string obfuscatorName = DeobfuscatorInfo.THE_NAME;
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bool startedDeobfuscating = false;
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ResourceResolver resourceResolver;
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AssemblyResolver assemblyResolver;
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StringDecrypter stringDecrypter;
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ConstantsDecrypter constantsDecrypter;
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Int32ValueInliner int32ValueInliner;
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Int64ValueInliner int64ValueInliner;
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SingleValueInliner singleValueInliner;
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DoubleValueInliner doubleValueInliner;
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ProxyCallFixer proxyCallFixer;
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MethodsDecrypter methodsDecrypter;
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internal class Options : OptionsBase {
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public bool InlineMethods { get; set; }
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public bool RemoveInlinedMethods { get; set; }
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public bool DecryptMethods { get; set; }
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public bool DecryptResources { get; set; }
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public bool DecryptConstants { get; set; }
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public bool DumpEmbeddedAssemblies { get; set; }
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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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protected override bool CanInlineMethods {
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get { return startedDeobfuscating ? options.InlineMethods : true; }
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}
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public override IEnumerable<IBlocksDeobfuscator> BlocksDeobfuscators {
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get {
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var list = new List<IBlocksDeobfuscator>();
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if (CanInlineMethods)
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list.Add(new BabelMethodCallInliner());
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return list;
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}
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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 Initialize(ModuleDefMD module) {
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base.Initialize(module);
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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(resourceResolver.Detected) +
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ToInt32(assemblyResolver.Detected) +
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ToInt32(stringDecrypter.Detected) +
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ToInt32(constantsDecrypter.Detected) +
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ToInt32(proxyCallFixer.Detected) +
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ToInt32(methodsDecrypter.Detected) +
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ToInt32(HasMetadataStream("Babel"));
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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if (foundBabelAttribute)
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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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FindBabelAttribute();
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var resourceDecrypterCreator = new ResourceDecrypterCreator(module, DeobfuscatedFile);
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resourceResolver = new ResourceResolver(module, resourceDecrypterCreator.Create(), DeobfuscatedFile);
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resourceResolver.Find();
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assemblyResolver = new AssemblyResolver(module, resourceDecrypterCreator.Create());
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assemblyResolver.Find();
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stringDecrypter = new StringDecrypter(module, resourceDecrypterCreator.Create());
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stringDecrypter.Find(DeobfuscatedFile);
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constantsDecrypter = new ConstantsDecrypter(module, resourceDecrypterCreator.Create(), initializedDataCreator);
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constantsDecrypter.Find();
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proxyCallFixer = new ProxyCallFixer(module);
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proxyCallFixer.FindDelegateCreator();
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methodsDecrypter = new MethodsDecrypter(module, resourceDecrypterCreator.Create(), DeobfuscatedFile.DeobfuscatorContext);
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methodsDecrypter.Find();
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}
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void FindBabelAttribute() {
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foreach (var type in module.Types) {
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if (type.FullName == "BabelAttribute" || type.FullName == "BabelObfuscatorAttribute") {
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foundBabelAttribute = true;
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CheckVersion(type);
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AddAttributeToBeRemoved(type, "Obfuscator attribute");
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return;
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}
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}
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}
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void CheckVersion(TypeDef attr) {
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var versionField = attr.FindField("Version");
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if (versionField != null && versionField.IsLiteral && versionField.Constant != null && versionField.Constant.Value is string) {
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var val = Regex.Match((string)versionField.Constant.Value, @"^(\d+\.\d+\.\d+\.\d+)$");
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if (val.Groups.Count < 2)
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return;
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obfuscatorName = string.Format("{0} {1}", DeobfuscatorInfo.THE_NAME, val.Groups[1].ToString());
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return;
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}
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}
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public override void DeobfuscateBegin() {
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base.DeobfuscateBegin();
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if (options.DecryptResources) {
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AddCctorInitCallToBeRemoved(resourceResolver.InitMethod);
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AddTypeToBeRemoved(resourceResolver.Type, "Resource resolver type");
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}
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DecryptResources();
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stringDecrypter.Initialize();
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if (Operations.DecryptStrings != OpDecryptString.None) {
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if (stringDecrypter.Resource != null)
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Logger.v("Adding string decrypter. Resource: {0}", Utils.ToCsharpString(stringDecrypter.Resource.Name));
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staticStringInliner.Add(stringDecrypter.DecryptMethod, (method, gim, args) => {
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return stringDecrypter.Decrypt(args);
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});
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DeobfuscatedFile.StringDecryptersAdded();
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}
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if (options.DumpEmbeddedAssemblies) {
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assemblyResolver.Initialize(DeobfuscatedFile, this);
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// Need to dump the assemblies before decrypting methods in case there's a reference
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// in the encrypted code to one of these assemblies.
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DumpEmbeddedAssemblies();
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}
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if (options.DecryptMethods) {
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methodsDecrypter.Initialize(DeobfuscatedFile, this);
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methodsDecrypter.decrypt();
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}
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if (options.DecryptConstants) {
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constantsDecrypter.Initialize(DeobfuscatedFile, this);
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AddTypeToBeRemoved(constantsDecrypter.Type, "Constants decrypter type");
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AddResourceToBeRemoved(constantsDecrypter.Resource, "Encrypted constants");
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int32ValueInliner = new Int32ValueInliner();
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int32ValueInliner.Add(constantsDecrypter.Int32Decrypter, (method, gim, args) => constantsDecrypter.DecryptInt32((int)args[0]));
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int64ValueInliner = new Int64ValueInliner();
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int64ValueInliner.Add(constantsDecrypter.Int64Decrypter, (method, gim, args) => constantsDecrypter.DecryptInt64((int)args[0]));
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singleValueInliner = new SingleValueInliner();
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singleValueInliner.Add(constantsDecrypter.SingleDecrypter, (method, gim, args) => constantsDecrypter.DecryptSingle((int)args[0]));
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doubleValueInliner = new DoubleValueInliner();
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doubleValueInliner.Add(constantsDecrypter.DoubleDecrypter, (method, gim, args) => constantsDecrypter.DecryptDouble((int)args[0]));
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}
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proxyCallFixer.Find();
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startedDeobfuscating = true;
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}
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void DumpEmbeddedAssemblies() {
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if (!options.DumpEmbeddedAssemblies)
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return;
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foreach (var info in assemblyResolver.EmbeddedAssemblyInfos)
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DeobfuscatedFile.CreateAssemblyFile(info.data, Utils.GetAssemblySimpleName(info.fullname), info.extension);
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AddTypeToBeRemoved(assemblyResolver.Type, "Assembly resolver type");
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AddCctorInitCallToBeRemoved(assemblyResolver.InitMethod);
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AddResourceToBeRemoved(assemblyResolver.EncryptedResource, "Embedded encrypted assemblies");
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}
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void DecryptResources() {
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if (!options.DecryptResources)
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return;
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var rsrc = resourceResolver.MergeResources();
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if (rsrc == null)
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return;
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AddResourceToBeRemoved(rsrc, "Encrypted resources");
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}
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public override void DeobfuscateMethodEnd(Blocks blocks) {
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proxyCallFixer.Deobfuscate(blocks);
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if (options.DecryptConstants) {
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int32ValueInliner.Decrypt(blocks);
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int64ValueInliner.Decrypt(blocks);
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singleValueInliner.Decrypt(blocks);
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doubleValueInliner.Decrypt(blocks);
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constantsDecrypter.Deobfuscate(blocks);
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}
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base.DeobfuscateMethodEnd(blocks);
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}
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public override void DeobfuscateEnd() {
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RemoveInlinedMethods();
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if (CanRemoveStringDecrypterType) {
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AddResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
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AddTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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}
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RemoveProxyDelegates(proxyCallFixer);
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base.DeobfuscateEnd();
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}
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void RemoveInlinedMethods() {
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if (!options.InlineMethods || !options.RemoveInlinedMethods)
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return;
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RemoveInlinedMethods(BabelMethodCallInliner.Find(module, staticStringInliner.Methods));
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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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