Dump embedded assemblies
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09e840923d
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@ -79,6 +79,7 @@
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<Compile Include="deobfuscators\CliSecure\ResourceDecrypter.cs" />
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<Compile Include="deobfuscators\CliSecure\StackFrameHelper.cs" />
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<Compile Include="deobfuscators\CliSecure\StringDecrypter.cs" />
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<Compile Include="deobfuscators\CodeVeil\AssemblyResolver.cs" />
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<Compile Include="deobfuscators\CodeVeil\MethodsDecrypter.cs" />
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<Compile Include="deobfuscators\CodeVeil\ObfuscatorVersion.cs" />
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<Compile Include="deobfuscators\CodeVeil\StringDecrypter.cs" />
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191
de4dot.code/deobfuscators/CodeVeil/AssemblyResolver.cs
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191
de4dot.code/deobfuscators/CodeVeil/AssemblyResolver.cs
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@ -0,0 +1,191 @@
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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 System.IO;
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using System.Xml;
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using Mono.Cecil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.CodeVeil {
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class AssemblyResolver {
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ModuleDefinition module;
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EmbeddedResource bundleData;
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EmbeddedResource bundleXmlFile;
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TypeDefinition bundleType;
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List<AssemblyInfo> infos = new List<AssemblyInfo>();
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public class AssemblyInfo {
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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 byte[] data;
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public AssemblyInfo(string fullName, string extension, byte[] data) {
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this.fullName = fullName;
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this.simpleName = Utils.getAssemblySimpleName(fullName);
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this.extension = extension;
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this.data = data;
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}
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public override string ToString() {
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return fullName;
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}
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}
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public IEnumerable<AssemblyInfo> AssemblyInfos {
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get { return infos; }
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}
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public EmbeddedResource BundleDataResource {
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get { return bundleData; }
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}
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public EmbeddedResource BundleXmlFileResource {
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get { return bundleXmlFile; }
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}
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public AssemblyResolver(ModuleDefinition module) {
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this.module = module;
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}
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public void initialize() {
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if (!findTypeAndResources())
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return;
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findEmbeddedAssemblies();
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}
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bool findTypeAndResources() {
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var bundleDataTmp = DotNetUtils.getResource(module, ".bundle.dat") as EmbeddedResource;
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var bundleXmlFileTmp = DotNetUtils.getResource(module, ".bundle.manifest") as EmbeddedResource;
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if (bundleDataTmp == null || bundleXmlFileTmp == null)
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return false;
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var bundleTypeTmp = findBundleType();
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if (bundleTypeTmp == null)
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return false;
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bundleData = bundleDataTmp;
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bundleXmlFile = bundleXmlFileTmp;
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bundleType = bundleTypeTmp;
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return true;
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}
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void findEmbeddedAssemblies() {
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var data = bundleData.GetResourceData();
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var doc = new XmlDocument();
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doc.Load(XmlReader.Create(bundleXmlFile.GetResourceStream()));
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var manifest = doc.DocumentElement;
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if (manifest.Name.ToLowerInvariant() != "manifest") {
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Log.w("Could not find Manifest element");
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return;
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}
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foreach (var tmp in manifest.ChildNodes) {
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var assemblyElem = tmp as XmlElement;
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if (assemblyElem == null)
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continue;
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if (assemblyElem.Name.ToLowerInvariant() != "assembly") {
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Log.w("Unknown element: {0}", assemblyElem.Name);
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continue;
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}
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int offset = getAttributeValueUInt32(assemblyElem, "offset");
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if (offset < 0) {
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Log.w("Could not find offset attribute");
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continue;
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}
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var assemblyData = DeobUtils.inflate(data, offset, data.Length - offset, true);
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var mod = ModuleDefinition.ReadModule(new MemoryStream(assemblyData));
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infos.Add(new AssemblyInfo(mod.Assembly.FullName, DeobUtils.getExtension(mod.Kind), assemblyData));
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}
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}
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static int getAttributeValueUInt32(XmlElement elem, string attrName) {
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var str = elem.GetAttribute(attrName);
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if (string.IsNullOrEmpty(str))
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return -1;
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int value;
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if (!int.TryParse(str, out value))
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return -1;
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return value;
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}
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TypeDefinition findBundleType() {
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foreach (var type in module.Types) {
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if (type.Namespace != "")
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continue;
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if (type.Fields.Count != 2)
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continue;
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var ctor = DotNetUtils.getMethod(type, ".ctor");
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if (ctor == null || !ctor.IsPrivate)
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continue;
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if (!DotNetUtils.isMethod(ctor, "System.Void", "(System.Reflection.Assembly)"))
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continue;
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var initMethodTmp = findInitMethod(type);
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if (initMethodTmp == null)
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continue;
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var getTempFilenameMethod = findGetTempFilenameMethod(type);
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if (getTempFilenameMethod == null)
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continue;
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return type;
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}
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return null;
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}
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MethodDefinition findInitMethod(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!method.IsStatic || method.Body == null)
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continue;
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if (!method.IsPublic && !method.IsAssembly)
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continue;
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if (!DotNetUtils.isMethod(method, "System.Void", "(System.Reflection.Assembly)"))
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continue;
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return method;
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}
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return null;
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}
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MethodDefinition findGetTempFilenameMethod(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (method.IsStatic || method.Body == null)
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continue;
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if (!method.IsPublic && !method.IsAssembly)
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continue;
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if (!DotNetUtils.isMethod(method, "System.String", "(System.String)"))
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continue;
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return method;
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}
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return null;
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}
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}
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}
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@ -60,6 +60,7 @@ namespace de4dot.code.deobfuscators.CodeVeil {
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MethodsDecrypter methodsDecrypter;
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ProxyDelegateFinder proxyDelegateFinder;
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StringDecrypter stringDecrypter;
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AssemblyResolver assemblyResolver;
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internal class Options : OptionsBase {
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}
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@ -176,10 +177,21 @@ namespace de4dot.code.deobfuscators.CodeVeil {
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DeobfuscatedFile.stringDecryptersAdded();
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}
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assemblyResolver = new AssemblyResolver(module);
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assemblyResolver.initialize();
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dumpEmbeddedAssemblies();
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proxyDelegateFinder.initialize();
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proxyDelegateFinder.find();
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}
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void dumpEmbeddedAssemblies() {
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foreach (var info in assemblyResolver.AssemblyInfos)
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DeobfuscatedFile.createAssemblyFile(info.data, info.simpleName, info.extension);
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addResourceToBeRemoved(assemblyResolver.BundleDataResource, "Embedded assemblies resource");
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addResourceToBeRemoved(assemblyResolver.BundleXmlFileResource, "Embedded assemblies XML file resource");
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}
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public override void deobfuscateMethodBegin(blocks.Blocks blocks) {
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proxyDelegateFinder.deobfuscate(blocks);
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base.deobfuscateMethodBegin(blocks);
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