95 lines
3.0 KiB
C#
95 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.SmartAssembly {
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class ResourceDecrypterInfo {
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ModuleDefMD module;
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MethodDef simpleZipTypeDecryptMethod;
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public byte[] DES_Key { get; private set; }
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public byte[] DES_IV { get; private set; }
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public byte[] AES_Key { get; private set; }
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public byte[] AES_IV { get; private set; }
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public bool CanDecrypt {
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get { return simpleZipTypeDecryptMethod != null; }
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}
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public ResourceDecrypterInfo(ModuleDefMD module) {
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this.module = module;
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}
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public ResourceDecrypterInfo(ModuleDefMD module, MethodDef simpleZipTypeDecryptMethod, ISimpleDeobfuscator simpleDeobfuscator)
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: this(module) {
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SetSimpleZipType(simpleZipTypeDecryptMethod, simpleDeobfuscator);
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}
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public void SetSimpleZipType(MethodDef method, ISimpleDeobfuscator simpleDeobfuscator) {
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if (simpleZipTypeDecryptMethod != null || method == null)
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return;
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simpleZipTypeDecryptMethod = method;
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Initialize(simpleDeobfuscator, method);
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}
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void Initialize(ISimpleDeobfuscator simpleDeobfuscator, MethodDef method) {
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var desList = new List<byte[]>(2);
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var aesList = new List<byte[]>(2);
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var instructions = method.Body.Instructions;
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simpleDeobfuscator.Deobfuscate(method);
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for (int i = 0; i <= instructions.Count - 2; i++) {
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var ldtoken = instructions[i];
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if (ldtoken.OpCode.Code != Code.Ldtoken)
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continue;
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var field = DotNetUtils.GetField(module, ldtoken.Operand as IField);
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if (field == null)
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continue;
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if (field.InitialValue == null)
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continue;
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var call = instructions[i + 1];
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if (call.OpCode.Code != Code.Call)
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continue;
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var calledMethod = call.Operand as IMethod;
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if (!DotNetUtils.IsMethod(calledMethod, "System.Void", "(System.Array,System.RuntimeFieldHandle)"))
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continue;
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if (field.InitialValue.Length == 8)
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desList.Add(field.InitialValue);
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else if (field.InitialValue.Length == 16)
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aesList.Add(field.InitialValue);
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}
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if (desList.Count >= 2) {
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DES_Key = desList[desList.Count - 2];
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DES_IV = desList[desList.Count - 1];
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}
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if (aesList.Count >= 2) {
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AES_Key = aesList[aesList.Count - 2];
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AES_IV = aesList[aesList.Count - 1];
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}
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}
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}
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}
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