107 lines
3.0 KiB
C#
107 lines
3.0 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.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.v3 {
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// Find the assembly resolver that's used in lib mode (3.8+)
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class LibAssemblyResolver {
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ModuleDefMD module;
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MethodDef initMethod;
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List<EmbeddedResource> resources = new List<EmbeddedResource>();
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public TypeDef Type {
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get { return initMethod == null ? null : initMethod.DeclaringType; }
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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 IEnumerable<EmbeddedResource> Resources {
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get { return resources; }
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}
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public LibAssemblyResolver(ModuleDefMD module) {
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this.module = module;
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}
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public void Find(ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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if (CheckInitMethod(DotNetUtils.GetModuleTypeCctor(module), simpleDeobfuscator, deob))
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return;
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if (CheckInitMethod(module.EntryPoint, simpleDeobfuscator, deob))
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return;
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}
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bool CheckInitMethod(MethodDef checkMethod, ISimpleDeobfuscator simpleDeobfuscator, IDeobfuscator deob) {
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var requiredFields = new string[] {
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"System.Collections.Hashtable",
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"System.Boolean",
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};
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foreach (var method in DotNetUtils.GetCalledMethods(module, checkMethod)) {
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if (method.Body == null)
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continue;
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if (!method.IsStatic)
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continue;
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if (!DotNetUtils.IsMethod(method, "System.Void", "()"))
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continue;
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var type = method.DeclaringType;
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if (!new FieldTypes(type).Exactly(requiredFields))
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continue;
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var ctor = type.FindMethod(".ctor");
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if (ctor == null)
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continue;
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var handler = DeobUtils.GetResolveMethod(ctor);
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if (handler == null)
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continue;
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simpleDeobfuscator.DecryptStrings(handler, deob);
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var resourcePrefix = GetResourcePrefix(handler);
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if (resourcePrefix == null)
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continue;
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for (int i = 0; ; i++) {
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var resource = DotNetUtils.GetResource(module, resourcePrefix + i.ToString("D5")) as EmbeddedResource;
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if (resource == null)
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break;
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resources.Add(resource);
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}
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initMethod = method;
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return true;
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}
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return false;
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}
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string GetResourcePrefix(MethodDef handler) {
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foreach (var s in DotNetUtils.GetCodeStrings(handler)) {
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var resource = DotNetUtils.GetResource(module, s + "00000") as EmbeddedResource;
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if (resource != null)
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return s;
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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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