131 lines
3.8 KiB
C#
131 lines
3.8 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.IO;
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using dnlib.IO;
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using dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Babel_NET {
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class AssemblyResolver {
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ModuleDefMD module;
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ResourceDecrypter resourceDecrypter;
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TypeDef resolverType;
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MethodDef registerMethod;
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EmbeddedResource encryptedResource;
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EmbeddedAssemblyInfo[] embeddedAssemblyInfos = new EmbeddedAssemblyInfo[0];
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public class EmbeddedAssemblyInfo {
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public string fullname;
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public string extension;
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public byte[] data;
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public EmbeddedAssemblyInfo(string fullName, string extension, byte[] data) {
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this.fullname = fullName;
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this.extension = extension;
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this.data = data;
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}
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}
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public bool Detected {
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get { return resolverType != null; }
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}
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public TypeDef Type {
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get { return resolverType; }
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}
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public MethodDef InitMethod {
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get { return registerMethod; }
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}
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public EmbeddedResource EncryptedResource {
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get { return encryptedResource; }
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}
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public EmbeddedAssemblyInfo[] EmbeddedAssemblyInfos {
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get { return embeddedAssemblyInfos; }
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}
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public AssemblyResolver(ModuleDefMD module, ResourceDecrypter resourceDecrypter) {
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this.module = module;
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this.resourceDecrypter = resourceDecrypter;
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}
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public void Find() {
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var requiredTypes = new string[] {
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"System.Object",
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"System.Int32",
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"System.Collections.Hashtable",
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};
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foreach (var type in module.Types) {
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if (type.HasEvents)
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continue;
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if (!new FieldTypes(type).Exactly(requiredTypes))
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continue;
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MethodDef regMethod, handler;
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if (!BabelUtils.FindRegisterMethod(type, out regMethod, out handler))
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continue;
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var decryptMethod = FindDecryptMethod(type);
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if (decryptMethod == null)
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throw new ApplicationException("Couldn't find resource type decrypt method");
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resourceDecrypter.DecryptMethod = ResourceDecrypter.FindDecrypterMethod(decryptMethod);
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resolverType = type;
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registerMethod = regMethod;
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return;
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}
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}
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static MethodDef FindDecryptMethod(TypeDef type) {
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foreach (var method in type.Methods) {
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if (!DotNetUtils.IsMethod(method, "System.Void", "(System.IO.Stream)"))
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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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public void Initialize(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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if (resolverType == null)
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return;
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encryptedResource = BabelUtils.FindEmbeddedResource(module, resolverType, simpleDeobfuscator, deob);
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if (encryptedResource == null) {
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Logger.w("Could not find embedded assemblies resource");
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return;
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}
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var decrypted = resourceDecrypter.Decrypt(encryptedResource.Data.ReadAllBytes());
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var reader = new BinaryReader(new MemoryStream(decrypted));
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int numAssemblies = reader.ReadInt32();
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embeddedAssemblyInfos = new EmbeddedAssemblyInfo[numAssemblies];
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for (int i = 0; i < numAssemblies; i++) {
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string name = reader.ReadString();
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var data = reader.ReadBytes(reader.ReadInt32());
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var mod = ModuleDefMD.Load(data);
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embeddedAssemblyInfos[i] = new EmbeddedAssemblyInfo(name, DeobUtils.GetExtension(mod.Kind), data);
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}
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}
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}
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}
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