141 lines
4.0 KiB
C#
141 lines
4.0 KiB
C#
/*
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Copyright (C) 2011 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.IO;
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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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namespace de4dot.code.deobfuscators.Babel_NET {
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class ResourceResolver {
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ModuleDefinition module;
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TypeDefinition resolverType;
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MethodDefinition registerMethod;
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EmbeddedResource encryptedResource;
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public bool Detected {
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get { return resolverType != null; }
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}
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public TypeDefinition Type {
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get { return resolverType; }
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}
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public MethodDefinition InitMethod {
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get { return registerMethod; }
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}
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public ResourceResolver(ModuleDefinition module) {
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this.module = module;
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}
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public void find() {
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var requiredTypes = new string[] {
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"System.Reflection.Assembly",
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"System.Object",
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"System.Int32",
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"System.String[]",
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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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MethodDefinition regMethod, handler;
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if (!findRegisterMethod(type, out regMethod, out handler))
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continue;
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var resource = findEmbeddedResource(type);
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if (resource == null)
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continue;
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resolverType = type;
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registerMethod = regMethod;
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encryptedResource = resource;
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return;
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}
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}
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bool findRegisterMethod(TypeDefinition type, out MethodDefinition regMethod, out MethodDefinition handler) {
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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.Body.ExceptionHandlers.Count != 1)
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continue;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code != Code.Ldftn)
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continue;
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var handlerRef = instr.Operand as MethodReference;
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if (handlerRef == null)
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continue;
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if (!DotNetUtils.isMethod(handlerRef, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)"))
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continue;
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if (!MemberReferenceHelper.compareTypes(type, handlerRef.DeclaringType))
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continue;
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handler = DotNetUtils.getMethod(type, handlerRef);
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if (handler == null)
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continue;
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if (handler.Body == null || handler.Body.ExceptionHandlers.Count != 1)
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continue;
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regMethod = method;
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return true;
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}
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}
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regMethod = null;
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handler = null;
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return false;
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}
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EmbeddedResource findEmbeddedResource(TypeDefinition type) {
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foreach (var method in type.Methods) {
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if (!DotNetUtils.isMethod(method, "System.String", "()"))
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continue;
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foreach (var s in DotNetUtils.getCodeStrings(method)) {
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var resource = DotNetUtils.getResource(module, s) as EmbeddedResource;
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if (resource != null)
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return resource;
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}
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}
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return null;
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}
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public EmbeddedResource mergeResources() {
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if (encryptedResource == null)
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return null;
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DeobUtils.decryptAndAddResources(module, encryptedResource.Name, () => decryptResourceAssembly());
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var result = encryptedResource;
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encryptedResource = null;
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return result;
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}
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byte[] decryptResourceAssembly() {
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var decrypted = new ResourceDecrypter(module).decrypt(encryptedResource.GetResourceData());
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var reader = new BinaryReader(new MemoryStream(decrypted));
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int numResources = reader.ReadInt32();
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for (int i = 0; i < numResources; i++)
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reader.ReadString();
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return reader.ReadBytes((int)(reader.BaseStream.Length - reader.BaseStream.Position));
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}
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}
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}
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