156 lines
4.7 KiB
C#
156 lines
4.7 KiB
C#
/*
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Copyright (C) 2011-2014 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 dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v4 {
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class ResourceResolver {
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ModuleDefMD module;
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EncryptedResource encryptedResource;
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MethodDef initMethod;
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public bool Detected {
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get { return encryptedResource.Method != null; }
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}
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public TypeDef Type {
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get { return encryptedResource.Type; }
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}
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public MethodDef InitMethod {
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get { return initMethod; }
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}
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public bool FoundResource {
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get { return encryptedResource.FoundResource; }
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}
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public ResourceResolver(ModuleDefMD module) {
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this.module = module;
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this.encryptedResource = new EncryptedResource(module);
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}
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public ResourceResolver(ModuleDefMD module, ResourceResolver oldOne) {
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this.module = module;
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this.encryptedResource = new EncryptedResource(module, oldOne.encryptedResource);
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}
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public void Find(ISimpleDeobfuscator simpleDeobfuscator) {
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var additionalTypes = new string[] {
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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.BaseType == null || type.BaseType.FullName != "System.Object")
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continue;
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if (!CheckFields(type.Fields))
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continue;
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foreach (var method in type.Methods) {
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if (!method.IsStatic || !method.HasBody)
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continue;
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if (!DotNetUtils.IsMethod(method, "System.Reflection.Assembly", "(System.Object,System.ResolveEventArgs)") &&
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!DotNetUtils.IsMethod(method, "System.Reflection.Assembly", "(System.Object,System.Object)"))
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continue;
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if (!encryptedResource.CouldBeResourceDecrypter(method, additionalTypes, false))
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continue;
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encryptedResource.Method = method;
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return;
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}
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}
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}
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bool CheckFields(IList<FieldDef> fields) {
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if (fields.Count != 3)
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return false;
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var fieldTypes = new FieldTypes(fields);
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if (fieldTypes.Count("System.Boolean") != 1)
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return false;
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if (fieldTypes.Count("System.Object") == 2)
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return true;
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return fieldTypes.Count("System.Reflection.Assembly") == 1 &&
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fieldTypes.Count("System.String[]") == 1;
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}
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public void Initialize(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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if (encryptedResource.Method == null)
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return;
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initMethod = FindInitMethod(simpleDeobfuscator);
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if (initMethod == null)
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throw new ApplicationException("Could not find resource resolver init method");
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simpleDeobfuscator.Deobfuscate(encryptedResource.Method);
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simpleDeobfuscator.DecryptStrings(encryptedResource.Method, deob);
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encryptedResource.Initialize(simpleDeobfuscator);
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}
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MethodDef FindInitMethod(ISimpleDeobfuscator simpleDeobfuscator) {
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var ctor = Type.FindMethod(".ctor");
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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 (!DotNetUtils.IsMethod(method, "System.Void", "()"))
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continue;
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if (method.Body.Variables.Count > 1)
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continue;
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simpleDeobfuscator.Deobfuscate(method);
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bool stsfldUsed = false, newobjUsed = false;
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foreach (var instr in method.Body.Instructions) {
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if (instr.OpCode.Code == Code.Stsfld) {
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var field = instr.Operand as IField;
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if (field == null || field.FieldSig.GetFieldType().GetElementType() != ElementType.Boolean)
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continue;
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if (!new SigComparer().Equals(Type, field.DeclaringType))
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continue;
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stsfldUsed = true;
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}
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else if (instr.OpCode.Code == Code.Newobj) {
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var calledCtor = instr.Operand as IMethod;
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if (calledCtor == null)
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continue;
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if (!MethodEqualityComparer.CompareDeclaringTypes.Equals(calledCtor, ctor))
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continue;
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newobjUsed = true;
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}
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}
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if (!stsfldUsed || !newobjUsed)
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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 EmbeddedResource MergeResources() {
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if (encryptedResource.Resource == null)
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return null;
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DeobUtils.DecryptAndAddResources(module, encryptedResource.Resource.Name.String, () => {
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return QuickLZ.Decompress(encryptedResource.Decrypt());
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});
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return encryptedResource.Resource;
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}
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}
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}
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