2012-01-08 03:27:07 +08:00
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/*
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2012-01-10 06:04:52 +08:00
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Copyright (C) 2011-2012 de4dot@gmail.com
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2012-01-08 03:27:07 +08:00
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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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2012-01-11 09:35:02 +08:00
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using System.Text.RegularExpressions;
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2012-01-08 03:27:07 +08:00
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using Mono.Cecil;
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using de4dot.blocks;
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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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BoolOption decryptMethods;
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BoolOption decryptResources;
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BoolOption decryptConstants;
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2012-01-18 14:43:03 +08:00
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BoolOption dumpEmbeddedAssemblies;
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2012-01-08 03:27:07 +08:00
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public DeobfuscatorInfo()
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: base() {
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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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2012-01-18 14:43:03 +08:00
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dumpEmbeddedAssemblies = new BoolOption(null, makeArgName("embedded"), "Dump embedded assemblies", true);
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2012-01-08 03:27:07 +08:00
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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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DecryptMethods = decryptMethods.get(),
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DecryptResources = decryptResources.get(),
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DecryptConstants = decryptConstants.get(),
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2012-01-18 14:43:03 +08:00
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DumpEmbeddedAssemblies = dumpEmbeddedAssemblies.get(),
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2012-01-08 03:27:07 +08:00
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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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decryptResources,
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decryptConstants,
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2012-01-18 14:43:03 +08:00
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dumpEmbeddedAssemblies,
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2012-01-08 03:27:07 +08:00
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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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2012-01-11 09:35:02 +08:00
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string obfuscatorName = DeobfuscatorInfo.THE_NAME;
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2012-01-08 03:27:07 +08:00
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ResourceResolver resourceResolver;
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2012-01-18 14:43:03 +08:00
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AssemblyResolver assemblyResolver;
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2012-01-08 03:27:07 +08:00
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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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ProxyDelegateFinder proxyDelegateFinder;
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MethodsDecrypter methodsDecrypter;
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internal class Options : OptionsBase {
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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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2012-01-18 14:43:03 +08:00
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public bool DumpEmbeddedAssemblies { get; set; }
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2012-01-08 03:27:07 +08:00
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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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2012-01-11 09:35:02 +08:00
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get { return obfuscatorName; }
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2012-01-08 03:27:07 +08:00
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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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int sum = toInt32(foundBabelAttribute) +
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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(proxyDelegateFinder.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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return val;
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}
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protected override void scanForObfuscator() {
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findBabelAttribute();
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resourceResolver = new ResourceResolver(module);
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resourceResolver.find();
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assemblyResolver = new AssemblyResolver(module);
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assemblyResolver.find();
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find();
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constantsDecrypter = new ConstantsDecrypter(module, initializedDataCreator);
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constantsDecrypter.find();
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proxyDelegateFinder = new ProxyDelegateFinder(module);
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proxyDelegateFinder.findDelegateCreator();
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methodsDecrypter = new MethodsDecrypter(module);
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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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2012-01-08 03:27:07 +08:00
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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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2012-01-11 09:35:02 +08:00
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void checkVersion(TypeDefinition attr) {
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var versionField = DotNetUtils.getFieldByName(attr, "Version");
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if (versionField != null && versionField.IsLiteral && versionField.Constant != null && versionField.Constant is string) {
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var val = Regex.Match((string)versionField.Constant, @"^(\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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2012-01-08 03:27:07 +08:00
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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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addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
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addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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2012-01-19 12:38:58 +08:00
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if (stringDecrypter.Resource != null)
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Log.v("Adding string decrypter. Resource: {0}", Utils.toCsharpString(stringDecrypter.Resource.Name));
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2012-01-20 02:19:08 +08:00
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staticStringInliner.add(stringDecrypter.DecryptMethod, (method, args) => {
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return stringDecrypter.decrypt(args);
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});
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DeobfuscatedFile.stringDecryptersAdded();
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2012-01-08 03:27:07 +08:00
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}
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2012-01-18 14:53:06 +08:00
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if (options.DumpEmbeddedAssemblies) {
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2012-01-18 14:43:03 +08:00
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assemblyResolver.initialize(DeobfuscatedFile, this);
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2012-01-18 14:53:06 +08:00
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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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2012-01-08 03:27:07 +08:00
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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, args) => constantsDecrypter.decryptInt32((int)args[0]));
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int64ValueInliner = new Int64ValueInliner();
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int64ValueInliner.add(constantsDecrypter.Int64Decrypter, (method, args) => constantsDecrypter.decryptInt64((int)args[0]));
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singleValueInliner = new SingleValueInliner();
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singleValueInliner.add(constantsDecrypter.SingleDecrypter, (method, args) => constantsDecrypter.decryptSingle((int)args[0]));
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doubleValueInliner = new DoubleValueInliner();
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doubleValueInliner.add(constantsDecrypter.DoubleDecrypter, (method, args) => constantsDecrypter.decryptDouble((int)args[0]));
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}
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proxyDelegateFinder.find();
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}
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2012-01-18 14:43:03 +08:00
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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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2012-01-08 03:27:07 +08:00
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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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proxyDelegateFinder.deobfuscate(blocks);
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if (options.DecryptConstants) {
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2012-01-14 19:37:20 +08:00
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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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2012-01-08 03:27:07 +08:00
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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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removeProxyDelegates(proxyDelegateFinder);
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methodsDecrypter.Dispose();
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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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if (stringDecrypter.DecryptMethod != null)
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list.Add(stringDecrypter.DecryptMethod.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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