118 lines
3.4 KiB
C#
118 lines
3.4 KiB
C#
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/*
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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;
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using System.Collections.Generic;
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using System.Text;
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using Mono.Cecil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor3 {
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// Find the type that decrypts strings and calls the native lib
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class DecrypterType {
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ModuleDefinition module;
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TypeDefinition decrypterType;
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MethodDefinition stringDecrypter1;
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MethodDefinition stringDecrypter2;
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List<MethodDefinition> initMethods = new List<MethodDefinition>();
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public bool Detected {
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get { return decrypterType != null; }
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}
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public TypeDefinition Type {
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get { return decrypterType; }
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}
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public MethodDefinition StringDecrypter1 {
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get { return stringDecrypter1; }
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}
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public MethodDefinition StringDecrypter2 {
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get { return stringDecrypter2; }
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}
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public IEnumerable<MethodDefinition> InitMethods {
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get { return initMethods; }
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}
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public IEnumerable<MethodDefinition> StringDecrypters {
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get {
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return new List<MethodDefinition> {
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stringDecrypter1,
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stringDecrypter2,
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};
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}
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}
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public DecrypterType(ModuleDefinition module) {
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this.module = module;
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}
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public DecrypterType(ModuleDefinition module, DecrypterType oldOne) {
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this.module = module;
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this.decrypterType = lookup(oldOne.decrypterType, "Could not find decrypterType");
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this.stringDecrypter1 = lookup(oldOne.stringDecrypter1, "Could not find stringDecrypter1");
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this.stringDecrypter2 = lookup(oldOne.stringDecrypter2, "Could not find stringDecrypter2");
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foreach (var method in oldOne.initMethods)
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initMethods.Add(lookup(method, "Could not find initMethod"));
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}
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T lookup<T>(T def, string errorMessage) where T : MemberReference {
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return DeobUtils.lookup(module, def, errorMessage);
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}
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public void find() {
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foreach (var type in module.Types) {
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if (type.FullName != "<PrivateImplementationDetails>{B4838DC1-AC79-43d1-949F-41B518B904A8}")
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continue;
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decrypterType = type;
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stringDecrypter1 = addStringDecrypter(type, "CS$0$0004");
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stringDecrypter2 = addStringDecrypter(type, "CS$0$0005");
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foreach (var method in type.Methods) {
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if (DotNetUtils.isMethod(method, "System.Void", "()"))
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initMethods.Add(method);
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}
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return;
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}
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}
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MethodDefinition addStringDecrypter(TypeDefinition type, string name) {
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var method = DotNetUtils.getMethod(type, name);
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if (method == null)
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return null;
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if (!DotNetUtils.isMethod(method, "System.String", "(System.String)"))
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return null;
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return method;
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}
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public string decrypt1(string s) {
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var sb = new StringBuilder(s.Length);
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foreach (var c in s)
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sb.Append((char)(0xFF - (byte)c));
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return sb.ToString();
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}
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public string decrypt2(string s) {
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return Encoding.Unicode.GetString(Convert.FromBase64String(s));
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}
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}
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}
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