179 lines
5.5 KiB
C#
179 lines
5.5 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.CodeFort {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "CodeFort";
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public const string THE_TYPE = "cf";
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const string DEFAULT_REGEX = @"!^[a-zA-Z]{1,3}$&!^[_<>{}$.`-]$&" + DeobfuscatorBase.DEFAULT_ASIAN_VALID_NAME_REGEX;
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BoolOption dumpEmbeddedAssemblies;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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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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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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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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ProxyCallFixer proxyCallFixer;
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StringDecrypter stringDecrypter;
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AssemblyDecrypter assemblyDecrypter;
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CfMethodCallInliner cfMethodCallInliner;
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internal class Options : OptionsBase {
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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 DeobfuscatorInfo.THE_NAME; }
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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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protected override int DetectInternal() {
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int val = 0;
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int sum = ToInt32(proxyCallFixer.Detected) +
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ToInt32(stringDecrypter.Detected) +
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ToInt32(assemblyDecrypter.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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proxyCallFixer = new ProxyCallFixer(module);
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proxyCallFixer.FindDelegateCreator();
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.Find();
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assemblyDecrypter = new AssemblyDecrypter(module);
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assemblyDecrypter.Find();
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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 || !assemblyDecrypter.EncryptedDetected)
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return false;
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newFileData = assemblyDecrypter.Decrypt();
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return newFileData != null;
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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.proxyCallFixer = new ProxyCallFixer(module);
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newOne.proxyCallFixer.FindDelegateCreator();
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newOne.stringDecrypter = new StringDecrypter(module);
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newOne.stringDecrypter.Find();
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newOne.assemblyDecrypter = new AssemblyDecrypter(module, assemblyDecrypter);
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newOne.assemblyDecrypter.Find();
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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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staticStringInliner.Add(stringDecrypter.Method, (method, gim, args) => stringDecrypter.Decrypt((string)args[0]));
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DeobfuscatedFile.StringDecryptersAdded();
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proxyCallFixer.Find();
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cfMethodCallInliner = new CfMethodCallInliner(proxyCallFixer);
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DumpEmbeddedAssemblies();
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}
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void DumpEmbeddedAssemblies() {
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if (assemblyDecrypter.MainAssemblyHasAssemblyResolver && !options.DumpEmbeddedAssemblies)
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return;
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foreach (var info in assemblyDecrypter.GetAssemblyInfos(DeobfuscatedFile, this)) {
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DeobfuscatedFile.CreateAssemblyFile(info.data, info.asmSimpleName, info.extension);
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AddResourceToBeRemoved(info.resource, string.Format("Embedded assembly: {0}", info.asmFullName));
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}
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AddCctorInitCallToBeRemoved(assemblyDecrypter.InitMethod);
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AddCallToBeRemoved(module.EntryPoint, assemblyDecrypter.InitMethod);
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AddTypeToBeRemoved(assemblyDecrypter.Type, "Assembly resolver type");
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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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InlineMethods(blocks);
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base.DeobfuscateMethodEnd(blocks);
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}
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void InlineMethods(Blocks blocks) {
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cfMethodCallInliner.DeobfuscateBegin(blocks);
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cfMethodCallInliner.Deobfuscate(blocks.MethodBlocks.GetAllBlocks());
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}
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public override void DeobfuscateEnd() {
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RemoveProxyDelegates(proxyCallFixer);
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AddTypeToBeRemoved(proxyCallFixer.ProxyMethodsType, "Type with proxy methods");
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if (CanRemoveStringDecrypterType)
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AddTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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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.Method != null)
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list.Add(stringDecrypter.Method.MDToken.ToInt32());
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return list;
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}
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}
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}
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