Add DS obfuscator support
This commit is contained in:
parent
080a11c437
commit
991a5281ab
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@ -90,6 +90,13 @@
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<Compile Include="deobfuscators\DeobfuscatorBase.cs" />
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<Compile Include="deobfuscators\DeobfuscatorInfoBase.cs" />
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<Compile Include="deobfuscators\DeobUtils.cs" />
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<Compile Include="deobfuscators\DeepSea\AssemblyResolver.cs" />
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<Compile Include="deobfuscators\DeepSea\DsInlinedMethodsFinder.cs" />
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<Compile Include="deobfuscators\DeepSea\ResolverBase.cs" />
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<Compile Include="deobfuscators\DeepSea\ResourceResolver.cs" />
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<Compile Include="deobfuscators\DeepSea\StringDecrypter.cs" />
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<Compile Include="deobfuscators\DeepSea\Deobfuscator.cs" />
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<Compile Include="deobfuscators\DeepSea\MethodCallInliner.cs" />
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<Compile Include="deobfuscators\Dotfuscator\Deobfuscator.cs" />
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<Compile Include="deobfuscators\Dotfuscator\StringDecrypter.cs" />
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<Compile Include="deobfuscators\dotNET_Reactor\v3\AntiStrongName.cs" />
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93
de4dot.code/deobfuscators/DeepSea/AssemblyResolver.cs
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93
de4dot.code/deobfuscators/DeepSea/AssemblyResolver.cs
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@ -0,0 +1,93 @@
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/*
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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 System.IO;
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using System.Text.RegularExpressions;
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using Mono.Cecil;
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namespace de4dot.code.deobfuscators.DeepSea {
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class AssemblyResolver : ResolverBase {
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public class AssemblyInfo {
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public byte[] data;
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public string fullName;
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public string simpleName;
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public string extension;
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public EmbeddedResource resource;
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public AssemblyInfo(byte[] data, string fullName, string simpleName, string extension, EmbeddedResource resource) {
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this.data = data;
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this.fullName = fullName;
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this.simpleName = simpleName;
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this.extension = extension;
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this.resource = resource;
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}
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}
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public AssemblyResolver(ModuleDefinition module)
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: base(module) {
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}
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static string[] handlerLocalTypes = new string[] {
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"System.Byte[]",
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"System.Security.Cryptography.SHA1CryptoServiceProvider",
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"System.IO.Compression.DeflateStream",
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"System.IO.MemoryStream",
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"System.IO.Stream",
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"System.Reflection.Assembly",
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"System.String",
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};
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protected override bool checkHandlerMethodInternal(MethodDefinition handler) {
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return new LocalTypes(handler).all(handlerLocalTypes);
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}
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public IEnumerable<AssemblyInfo> getAssemblyInfos() {
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var infos = new List<AssemblyInfo>();
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foreach (var tmp in module.Resources) {
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var resource = tmp as EmbeddedResource;
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if (resource == null)
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continue;
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if (!Regex.IsMatch(resource.Name, @"^[0-9A-F]{40}$"))
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continue;
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var info = getAssemblyInfos(resource);
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if (info == null)
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continue;
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infos.Add(info);
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}
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return infos;
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}
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AssemblyInfo getAssemblyInfos(EmbeddedResource resource) {
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try {
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var decrypted = decryptResource(resource);
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var asm = AssemblyDefinition.ReadAssembly(new MemoryStream(decrypted));
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var fullName = asm.Name.FullName;
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var simpleName = asm.Name.Name;
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var extension = DeobUtils.getExtension(asm.Modules[0].Kind);
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return new AssemblyInfo(decrypted, fullName, simpleName, extension, resource);
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}
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catch (Exception) {
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return null;
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}
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}
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}
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}
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202
de4dot.code/deobfuscators/DeepSea/Deobfuscator.cs
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202
de4dot.code/deobfuscators/DeepSea/Deobfuscator.cs
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@ -0,0 +1,202 @@
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/*
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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.Collections.Generic;
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using Mono.Cecil;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.DeepSea {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "DeepSea";
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public const string THE_TYPE = "ds";
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BoolOption inlineMethods;
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BoolOption removeInlinedMethods;
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BoolOption decryptResources;
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BoolOption dumpEmbeddedAssemblies;
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public DeobfuscatorInfo()
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: base() {
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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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decryptResources = new BoolOption(null, makeArgName("rsrc"), "Decrypt resources", 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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DecryptResources = decryptResources.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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decryptResources,
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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 startedDeobfuscating = false;
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StringDecrypter stringDecrypter;
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ResourceResolver resourceResolver;
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AssemblyResolver assemblyResolver;
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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 DecryptResources { 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 TypeLong; }
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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 IMethodCallInliner MethodCallInliner {
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get {
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if (CanInlineMethods)
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return new MethodCallInliner();
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return new NoMethodInliner();
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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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protected override int detectInternal() {
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int val = 0;
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int sum = toInt32(stringDecrypter.Detected) +
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toInt32(resourceResolver.Detected) +
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toInt32(assemblyResolver.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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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find(DeobfuscatedFile);
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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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}
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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foreach (var method in stringDecrypter.DecrypterMethods) {
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staticStringInliner.add(method, (method2, args) => {
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return stringDecrypter.decrypt(method2, (int)args[0]);
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});
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}
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DeobfuscatedFile.stringDecryptersAdded();
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if (options.DecryptResources) {
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resourceResolver.initialize(DeobfuscatedFile, this);
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decryptResources();
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}
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dumpEmbeddedAssemblies();
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startedDeobfuscating = true;
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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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addCctorInitCallToBeRemoved(resourceResolver.InitMethod);
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addCallToBeRemoved(module.EntryPoint, resourceResolver.InitMethod);
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addMethodToBeRemoved(resourceResolver.InitMethod, "Resource resolver init method");
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addMethodToBeRemoved(resourceResolver.HandlerMethod, "Resource resolver handler method");
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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.getAssemblyInfos()) {
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DeobfuscatedFile.createAssemblyFile(info.data, info.simpleName, info.extension);
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addResourceToBeRemoved(info.resource, string.Format("Embedded assembly: {0}", info.fullName));
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}
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addCctorInitCallToBeRemoved(assemblyResolver.InitMethod);
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addCallToBeRemoved(module.EntryPoint, assemblyResolver.InitMethod);
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addMethodToBeRemoved(assemblyResolver.InitMethod, "Assembly resolver init method");
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addMethodToBeRemoved(assemblyResolver.HandlerMethod, "Assembly resolver handler method");
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}
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public override void deobfuscateEnd() {
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removeInlinedMethods();
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if (Operations.DecryptStrings != OpDecryptString.None)
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addMethodsToBeRemoved(stringDecrypter.DecrypterMethods, "String decrypter method");
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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(DsInlinedMethodsFinder.find(module));
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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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foreach (var method in stringDecrypter.DecrypterMethods)
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list.Add(method.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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38
de4dot.code/deobfuscators/DeepSea/DsInlinedMethodsFinder.cs
Normal file
38
de4dot.code/deobfuscators/DeepSea/DsInlinedMethodsFinder.cs
Normal file
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/*
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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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|
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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
|
||||
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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|
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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
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
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You should have received a copy of the GNU General Public License
|
||||
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 Mono.Cecil;
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namespace de4dot.code.deobfuscators.DeepSea {
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static class DsInlinedMethodsFinder {
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public static List<MethodDefinition> find(ModuleDefinition module) {
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var inlinedMethods = new List<MethodDefinition>();
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foreach (var type in module.GetTypes()) {
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foreach (var method in type.Methods) {
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if (MethodCallInliner.canInline(method))
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inlinedMethods.Add(method);
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}
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}
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return inlinedMethods;
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}
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}
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}
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185
de4dot.code/deobfuscators/DeepSea/MethodCallInliner.cs
Normal file
185
de4dot.code/deobfuscators/DeepSea/MethodCallInliner.cs
Normal file
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@ -0,0 +1,185 @@
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/*
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Copyright (C) 2011-2012 de4dot@gmail.com
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|
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This file is part of de4dot.
|
||||
|
||||
de4dot is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
de4dot is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
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*/
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|
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using System.Collections.Generic;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.DeepSea {
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class MethodCallInliner : MethodCallInlinerBase {
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InstructionEmulator instructionEmulator = new InstructionEmulator();
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protected override bool deobfuscateInternal() {
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bool changed = false;
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var instructions = block.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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var instr = instructions[i].Instruction;
|
||||
if (instr.OpCode.Code == Code.Call)
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||||
changed |= inlineMethod(instr, i);
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}
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return changed;
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||||
}
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||||
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||||
bool inlineMethod(Instruction callInstr, int instrIndex) {
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||||
var method = callInstr.Operand as MethodDefinition;
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if (method == null)
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||||
return false;
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||||
if (!canInline(method))
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||||
return false;
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||||
|
||||
if (instrIndex < 2)
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||||
return false;
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||||
var ldci4_1st = block.Instructions[instrIndex - 2];
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||||
var ldci4_2nd = block.Instructions[instrIndex - 1];
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||||
if (!ldci4_1st.isLdcI4() || !ldci4_2nd.isLdcI4())
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||||
return false;
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||||
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||||
if (!inlineMethod(method, instrIndex, ldci4_1st.getLdcI4Value(), ldci4_2nd.getLdcI4Value()))
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return false;
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||||
return true;
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||||
}
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||||
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||||
bool inlineMethod(MethodDefinition methodToInline, int instrIndex, int const1, int const2) {
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||||
var parameters = DotNetUtils.getParameters(methodToInline);
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||||
var arg1 = parameters[parameters.Count - 2];
|
||||
var arg2 = parameters[parameters.Count - 1];
|
||||
|
||||
instructionEmulator.init(methodToInline.HasImplicitThis, false, methodToInline.Parameters, methodToInline.Body.Variables);
|
||||
instructionEmulator.setArg(arg1, new Int32Value(const1));
|
||||
instructionEmulator.setArg(arg2, new Int32Value(const2));
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||||
|
||||
Instruction instr;
|
||||
var instrs = methodToInline.Body.Instructions;
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||||
int index = 0;
|
||||
int counter = 0;
|
||||
while (true) {
|
||||
if (counter++ >= 50)
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||||
return false;
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||||
if (index >= instrs.Count)
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||||
return false;
|
||||
instr = instrs[index];
|
||||
switch (instr.OpCode.Code) {
|
||||
case Code.Stloc:
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||||
case Code.Stloc_S:
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||||
case Code.Stloc_0:
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||||
case Code.Stloc_1:
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||||
case Code.Stloc_2:
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||||
case Code.Stloc_3:
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||||
case Code.Ldloc:
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||||
case Code.Ldloc_S:
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||||
case Code.Ldloc_0:
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||||
case Code.Ldloc_1:
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||||
case Code.Ldloc_2:
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||||
case Code.Ldloc_3:
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||||
case Code.Ldc_I4:
|
||||
case Code.Ldc_I4_0:
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||||
case Code.Ldc_I4_1:
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||||
case Code.Ldc_I4_2:
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||||
case Code.Ldc_I4_3:
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||||
case Code.Ldc_I4_4:
|
||||
case Code.Ldc_I4_5:
|
||||
case Code.Ldc_I4_6:
|
||||
case Code.Ldc_I4_7:
|
||||
case Code.Ldc_I4_8:
|
||||
case Code.Ldc_I4_M1:
|
||||
case Code.Ldc_I4_S:
|
||||
case Code.Add:
|
||||
case Code.Sub:
|
||||
case Code.Xor:
|
||||
case Code.Or:
|
||||
case Code.Nop:
|
||||
instructionEmulator.emulate(instr);
|
||||
index++;
|
||||
break;
|
||||
|
||||
case Code.Ldarg:
|
||||
case Code.Ldarg_S:
|
||||
case Code.Ldarg_0:
|
||||
case Code.Ldarg_1:
|
||||
case Code.Ldarg_2:
|
||||
case Code.Ldarg_3:
|
||||
var arg = DotNetUtils.getParameter(parameters, instr);
|
||||
if (arg != arg1 && arg != arg2)
|
||||
goto checkInline;
|
||||
instructionEmulator.emulate(instr);
|
||||
index++;
|
||||
break;
|
||||
|
||||
case Code.Call:
|
||||
case Code.Callvirt:
|
||||
case Code.Newobj:
|
||||
goto checkInline;
|
||||
|
||||
case Code.Switch:
|
||||
var value = instructionEmulator.pop() as Int32Value;
|
||||
if (value == null || !value.allBitsValid())
|
||||
return false;
|
||||
var targets = (Instruction[])instr.Operand;
|
||||
if (value.value >= 0 && value.value < targets.Length)
|
||||
index = instrs.IndexOf(targets[value.value]);
|
||||
else
|
||||
index++;
|
||||
break;
|
||||
|
||||
case Code.Br:
|
||||
case Code.Br_S:
|
||||
index = instrs.IndexOf((Instruction)instr.Operand);
|
||||
break;
|
||||
|
||||
default:
|
||||
return false;
|
||||
}
|
||||
}
|
||||
checkInline:
|
||||
if (!inlineOtherMethod(instrIndex, methodToInline, instr, index + 1, 2))
|
||||
return false;
|
||||
|
||||
block.insert(instrIndex, Instruction.Create(OpCodes.Pop));
|
||||
block.insert(instrIndex, Instruction.Create(OpCodes.Pop));
|
||||
return true;
|
||||
}
|
||||
|
||||
public static bool canInline(MethodDefinition method) {
|
||||
if (method == null || method.Body == null)
|
||||
return false;
|
||||
if (method.Body.ExceptionHandlers.Count > 0)
|
||||
return false;
|
||||
var parameters = method.Parameters;
|
||||
int paramCount = parameters.Count;
|
||||
if (paramCount < 2)
|
||||
return false;
|
||||
if (parameters[paramCount - 1].ParameterType.FullName != "System.Int32")
|
||||
return false;
|
||||
if (parameters[paramCount - 2].ParameterType.FullName != "System.Int32")
|
||||
return false;
|
||||
|
||||
if (method.Attributes != (MethodAttributes.Assembly | MethodAttributes.Static))
|
||||
return false;
|
||||
|
||||
//TODO: Also check that it has a switch statement and an xor instruction
|
||||
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
123
de4dot.code/deobfuscators/DeepSea/ResolverBase.cs
Normal file
123
de4dot.code/deobfuscators/DeepSea/ResolverBase.cs
Normal file
|
@ -0,0 +1,123 @@
|
|||
/*
|
||||
Copyright (C) 2011-2012 de4dot@gmail.com
|
||||
|
||||
This file is part of de4dot.
|
||||
|
||||
de4dot is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
de4dot is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
using System;
|
||||
using Mono.Cecil;
|
||||
using Mono.Cecil.Cil;
|
||||
using de4dot.blocks;
|
||||
|
||||
namespace de4dot.code.deobfuscators.DeepSea {
|
||||
abstract class ResolverBase {
|
||||
protected ModuleDefinition module;
|
||||
protected MethodDefinition initMethod;
|
||||
protected MethodDefinition resolveHandler;
|
||||
|
||||
public MethodDefinition InitMethod {
|
||||
get { return initMethod; }
|
||||
}
|
||||
|
||||
public MethodDefinition HandlerMethod {
|
||||
get { return resolveHandler; }
|
||||
}
|
||||
|
||||
public bool Detected {
|
||||
get { return initMethod != null; }
|
||||
}
|
||||
|
||||
public ResolverBase(ModuleDefinition module) {
|
||||
this.module = module;
|
||||
}
|
||||
|
||||
public void find() {
|
||||
if (checkCalledMethods(DotNetUtils.getModuleTypeCctor(module)))
|
||||
return;
|
||||
if (checkCalledMethods(module.EntryPoint))
|
||||
return;
|
||||
}
|
||||
|
||||
bool checkCalledMethods(MethodDefinition checkMethod) {
|
||||
if (checkMethod == null || checkMethod.Body == null)
|
||||
return false;
|
||||
|
||||
foreach (var tuple in DotNetUtils.getCalledMethods(module, checkMethod)) {
|
||||
var method = tuple.Item2;
|
||||
if (method.Name == ".cctor" || method.Name == ".ctor")
|
||||
continue;
|
||||
if (!method.IsStatic || !DotNetUtils.isMethod(method, "System.Void", "()"))
|
||||
continue;
|
||||
|
||||
if (checkResolverInitMethod(method))
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
bool checkResolverInitMethod(MethodDefinition resolverInitMethod) {
|
||||
if (resolverInitMethod == null || resolverInitMethod.Body == null)
|
||||
return false;
|
||||
|
||||
var resolveHandlerMethod = getLdftnMethod(resolverInitMethod);
|
||||
if (resolveHandlerMethod == null)
|
||||
return false;
|
||||
|
||||
if (!checkHandlerMethod(resolveHandlerMethod))
|
||||
return false;
|
||||
|
||||
initMethod = resolverInitMethod;
|
||||
resolveHandler = resolveHandlerMethod;
|
||||
return true;
|
||||
}
|
||||
|
||||
MethodDefinition getLdftnMethod(MethodDefinition method) {
|
||||
foreach (var instr in method.Body.Instructions) {
|
||||
if (instr.OpCode.Code != Code.Ldftn)
|
||||
continue;
|
||||
var loadedMethod = instr.Operand as MethodDefinition;
|
||||
if (loadedMethod != null)
|
||||
return loadedMethod;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
bool checkHandlerMethod(MethodDefinition handler) {
|
||||
if (handler == null || handler.Body == null)
|
||||
return false;
|
||||
if (!DotNetUtils.isMethod(handler, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
|
||||
return false;
|
||||
return checkHandlerMethodInternal(handler);
|
||||
}
|
||||
|
||||
protected abstract bool checkHandlerMethodInternal(MethodDefinition handler);
|
||||
|
||||
protected static byte[] decryptResource(EmbeddedResource resource) {
|
||||
var data = resource.GetResourceData();
|
||||
const int baseIndex = 1;
|
||||
for (int i = baseIndex; i < data.Length; i++)
|
||||
data[i] ^= (byte)((i - baseIndex) + data[0]);
|
||||
|
||||
if (BitConverter.ToInt16(data, baseIndex) != 0x5A4D)
|
||||
return DeobUtils.inflate(data, 1, data.Length - 1, true);
|
||||
|
||||
var data2 = new byte[data.Length - baseIndex];
|
||||
Array.Copy(data, baseIndex, data2, 0, data2.Length);
|
||||
return data2;
|
||||
}
|
||||
}
|
||||
}
|
66
de4dot.code/deobfuscators/DeepSea/ResourceResolver.cs
Normal file
66
de4dot.code/deobfuscators/DeepSea/ResourceResolver.cs
Normal file
|
@ -0,0 +1,66 @@
|
|||
/*
|
||||
Copyright (C) 2011-2012 de4dot@gmail.com
|
||||
|
||||
This file is part of de4dot.
|
||||
|
||||
de4dot is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
de4dot is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
using Mono.Cecil;
|
||||
|
||||
namespace de4dot.code.deobfuscators.DeepSea {
|
||||
class ResourceResolver : ResolverBase {
|
||||
EmbeddedResource resource;
|
||||
|
||||
public ResourceResolver(ModuleDefinition module)
|
||||
: base(module) {
|
||||
}
|
||||
|
||||
static string[] handlerLocalTypes = new string[] {
|
||||
"System.AppDomain",
|
||||
"System.Byte[]",
|
||||
"System.Collections.Generic.Dictionary`2<System.String,System.String>",
|
||||
"System.IO.Compression.DeflateStream",
|
||||
"System.IO.MemoryStream",
|
||||
"System.IO.Stream",
|
||||
"System.Reflection.Assembly",
|
||||
"System.String",
|
||||
"System.String[]",
|
||||
};
|
||||
protected override bool checkHandlerMethodInternal(MethodDefinition handler) {
|
||||
return new LocalTypes(handler).all(handlerLocalTypes);
|
||||
}
|
||||
|
||||
public void initialize(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
|
||||
if (resolveHandler == null)
|
||||
return;
|
||||
|
||||
simpleDeobfuscator.deobfuscate(resolveHandler);
|
||||
simpleDeobfuscator.decryptStrings(resolveHandler, deob);
|
||||
resource = DeobUtils.getEmbeddedResourceFromCodeStrings(module, resolveHandler);
|
||||
if (resource == null) {
|
||||
Log.w("Could not find resource of encrypted resources");
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
public EmbeddedResource mergeResources() {
|
||||
if (resource == null)
|
||||
return null;
|
||||
|
||||
DeobUtils.decryptAndAddResources(module, resource.Name, () => decryptResource(resource));
|
||||
return resource;
|
||||
}
|
||||
}
|
||||
}
|
264
de4dot.code/deobfuscators/DeepSea/StringDecrypter.cs
Normal file
264
de4dot.code/deobfuscators/DeepSea/StringDecrypter.cs
Normal file
|
@ -0,0 +1,264 @@
|
|||
/*
|
||||
Copyright (C) 2011-2012 de4dot@gmail.com
|
||||
|
||||
This file is part of de4dot.
|
||||
|
||||
de4dot is free software: you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation, either version 3 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
de4dot is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
using System.Collections.Generic;
|
||||
using System.Text;
|
||||
using Mono.Cecil;
|
||||
using Mono.Cecil.Cil;
|
||||
using de4dot.blocks;
|
||||
|
||||
namespace de4dot.code.deobfuscators.DeepSea {
|
||||
class StringDecrypter {
|
||||
ModuleDefinition module;
|
||||
MethodDefinitionAndDeclaringTypeDict<DecrypterInfo> methodToInfo = new MethodDefinitionAndDeclaringTypeDict<DecrypterInfo>();
|
||||
|
||||
class DecrypterInfo {
|
||||
MethodDefinition cctor;
|
||||
public MethodDefinition method;
|
||||
FieldDefinition cachedStringsField;
|
||||
FieldDefinition keyField;
|
||||
int magic;
|
||||
string[] encryptedStrings;
|
||||
short[] key;
|
||||
public DecrypterInfo(MethodDefinition cctor, MethodDefinition method) {
|
||||
this.cctor = cctor;
|
||||
this.method = method;
|
||||
}
|
||||
|
||||
public string decrypt(int magic2) {
|
||||
var es = encryptedStrings[magic ^ magic2];
|
||||
var sb = new StringBuilder(es.Length);
|
||||
for (int i = 0; i < es.Length; i++)
|
||||
sb.Append((char)(es[i] ^ key[(magic2 + i) % key.Length]));
|
||||
return sb.ToString();
|
||||
}
|
||||
|
||||
public bool initialize() {
|
||||
if (!findMagic(method, out magic))
|
||||
return false;
|
||||
|
||||
if (!findFields())
|
||||
return false;
|
||||
|
||||
if (!findEncryptedStrings(method))
|
||||
return false;
|
||||
|
||||
key = findKey();
|
||||
if (key.Length == 0)
|
||||
return false;
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool findFields() {
|
||||
foreach (var instr in method.Body.Instructions) {
|
||||
if (instr.OpCode.Code != Code.Stsfld && instr.OpCode.Code != Code.Ldsfld)
|
||||
continue;
|
||||
var field = instr.Operand as FieldDefinition;
|
||||
if (field == null)
|
||||
continue;
|
||||
if (!MemberReferenceHelper.compareTypes(method.DeclaringType, field.DeclaringType))
|
||||
continue;
|
||||
switch (field.FieldType.FullName) {
|
||||
case "System.Char[]":
|
||||
if (keyField != null && keyField != field)
|
||||
return false;
|
||||
keyField = field;
|
||||
break;
|
||||
|
||||
case "System.String[]":
|
||||
if (cachedStringsField != null && cachedStringsField != field)
|
||||
return false;
|
||||
cachedStringsField = field;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return keyField != null && cachedStringsField != null;
|
||||
}
|
||||
|
||||
short[] findKey() {
|
||||
var pkt = cctor.Module.Assembly.Name.PublicKeyToken;
|
||||
if (pkt != null && pkt.Length > 0)
|
||||
return getPublicKeyTokenKey(pkt);
|
||||
return findKey(cctor);
|
||||
}
|
||||
|
||||
short[] findKey(MethodDefinition initMethod) {
|
||||
var instrs = initMethod.Body.Instructions;
|
||||
for (int i = 0; i < instrs.Count - 1; i++) {
|
||||
var ldci4 = instrs[i];
|
||||
if (!DotNetUtils.isLdcI4(ldci4))
|
||||
continue;
|
||||
var newarr = instrs[i + 1];
|
||||
if (newarr.OpCode.Code != Code.Newarr)
|
||||
continue;
|
||||
if (newarr.Operand.ToString() != "System.Char")
|
||||
continue;
|
||||
|
||||
i++;
|
||||
var array = ArrayFinder.getInitializedInt16Array(DotNetUtils.getLdcI4Value(ldci4), initMethod, ref i);
|
||||
if (array == null)
|
||||
continue;
|
||||
i++;
|
||||
if (i >= instrs.Count)
|
||||
return null;
|
||||
var stsfld = instrs[i];
|
||||
if (stsfld.OpCode.Code != Code.Stsfld)
|
||||
continue;
|
||||
if (MemberReferenceHelper.compareFieldReferenceAndDeclaringType(keyField, stsfld.Operand as FieldReference))
|
||||
return array;
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
|
||||
static short[] getPublicKeyTokenKey(byte[] publicKeyToken) {
|
||||
var key = new short[publicKeyToken.Length];
|
||||
for (int i = 0; i < publicKeyToken.Length; i++) {
|
||||
int b = publicKeyToken[i];
|
||||
key[i] = (short)((b << 4) ^ b);
|
||||
}
|
||||
return key;
|
||||
}
|
||||
|
||||
static bool findMagic(MethodDefinition method, out int magic) {
|
||||
var instrs = method.Body.Instructions;
|
||||
for (int i = 0; i < instrs.Count - 2; i++) {
|
||||
var ldarg = instrs[i];
|
||||
if (DotNetUtils.getArgIndex(ldarg) != 0)
|
||||
continue;
|
||||
var ldci4 = instrs[i + 1];
|
||||
if (!DotNetUtils.isLdcI4(ldci4))
|
||||
continue;
|
||||
if (instrs[i + 2].OpCode.Code != Code.Xor)
|
||||
continue;
|
||||
magic = DotNetUtils.getLdcI4Value(ldci4);
|
||||
return true;
|
||||
}
|
||||
magic = 0;
|
||||
return false;
|
||||
}
|
||||
|
||||
bool findEncryptedStrings(MethodDefinition method) {
|
||||
var switchInstr = getOnlySwitchInstruction(method);
|
||||
if (switchInstr == null)
|
||||
return false;
|
||||
var targets = (Instruction[])switchInstr.Operand;
|
||||
encryptedStrings = new string[targets.Length];
|
||||
for (int i = 0; i < targets.Length; i++) {
|
||||
var target = targets[i];
|
||||
if (target.OpCode.Code != Code.Ldstr)
|
||||
return false;
|
||||
encryptedStrings[i] = (string)target.Operand;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static Instruction getOnlySwitchInstruction(MethodDefinition method) {
|
||||
Instruction switchInstr = null;
|
||||
foreach (var instr in method.Body.Instructions) {
|
||||
if (instr.OpCode.Code != Code.Switch)
|
||||
continue;
|
||||
if (switchInstr != null)
|
||||
return null;
|
||||
switchInstr = instr;
|
||||
}
|
||||
return switchInstr;
|
||||
}
|
||||
|
||||
public override string ToString() {
|
||||
return string.Format("M:{0:X8} N:{1}", magic, encryptedStrings.Length);
|
||||
}
|
||||
}
|
||||
|
||||
public bool Detected {
|
||||
get { return methodToInfo.Count != 0; }
|
||||
}
|
||||
|
||||
public List<MethodDefinition> DecrypterMethods {
|
||||
get {
|
||||
var methods = new List<MethodDefinition>(methodToInfo.Count);
|
||||
foreach (var info in methodToInfo.getValues())
|
||||
methods.Add(info.method);
|
||||
return methods;
|
||||
}
|
||||
}
|
||||
|
||||
public StringDecrypter(ModuleDefinition module) {
|
||||
this.module = module;
|
||||
}
|
||||
|
||||
public void find(ISimpleDeobfuscator simpleDeobfuscator) {
|
||||
bool hasPublicKeyToken = module.Assembly.Name.PublicKeyToken != null && module.Assembly.Name.PublicKeyToken.Length != 0;
|
||||
foreach (var type in module.GetTypes()) {
|
||||
if (!checkFields(type.Fields))
|
||||
continue;
|
||||
var cctor = DotNetUtils.getMethod(type, ".cctor");
|
||||
if (cctor == null)
|
||||
continue;
|
||||
if (!hasPublicKeyToken)
|
||||
simpleDeobfuscator.deobfuscate(cctor);
|
||||
foreach (var method in DotNetUtils.findMethods(type.Methods, "System.String", new string[] { "System.Int32" }, true)) {
|
||||
simpleDeobfuscator.deobfuscate(method);
|
||||
var info = getInfo(cctor, method);
|
||||
if (info == null)
|
||||
continue;
|
||||
methodToInfo.add(method, info);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static bool checkFields(IEnumerable<FieldDefinition> fields) {
|
||||
bool foundCharAry = false, foundStringAry = false;
|
||||
foreach (var field in fields) {
|
||||
if (foundCharAry && foundStringAry)
|
||||
break;
|
||||
switch (field.FieldType.FullName) {
|
||||
case "System.Char[]":
|
||||
foundCharAry = true;
|
||||
break;
|
||||
case "System.String[]":
|
||||
foundStringAry = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return foundCharAry && foundStringAry;
|
||||
}
|
||||
|
||||
DecrypterInfo getInfo(MethodDefinition cctor, MethodDefinition method) {
|
||||
if (method == null || method.Body == null)
|
||||
return null;
|
||||
|
||||
var info = new DecrypterInfo(cctor, method);
|
||||
if (!info.initialize())
|
||||
return null;
|
||||
|
||||
return info;
|
||||
}
|
||||
|
||||
public string decrypt(MethodReference method, int magic2) {
|
||||
var info = methodToInfo.find(method);
|
||||
return info.decrypt(magic2);
|
||||
}
|
||||
}
|
||||
}
|
|
@ -33,6 +33,7 @@ namespace de4dot.cui {
|
|||
new de4dot.code.deobfuscators.Babel_NET.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.CliSecure.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.CryptoObfuscator.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.DeepSea.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.Dotfuscator.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.dotNET_Reactor.v3.DeobfuscatorInfo(),
|
||||
new de4dot.code.deobfuscators.dotNET_Reactor.v4.DeobfuscatorInfo(),
|
||||
|
|
Loading…
Reference in New Issue
Block a user