95 lines
3.0 KiB
C#
95 lines
3.0 KiB
C#
/*
|
|
Copyright (C) 2011-2014 de4dot@gmail.com
|
|
|
|
This file is part of de4dot.
|
|
|
|
de4dot is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
de4dot is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with de4dot. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
using System.Collections.Generic;
|
|
using dnlib.DotNet;
|
|
using dnlib.DotNet.Emit;
|
|
using de4dot.blocks;
|
|
|
|
namespace de4dot.code.deobfuscators.SmartAssembly {
|
|
class ResourceDecrypterInfo {
|
|
ModuleDefMD module;
|
|
MethodDef simpleZipTypeDecryptMethod;
|
|
|
|
public byte[] DES_Key { get; private set; }
|
|
public byte[] DES_IV { get; private set; }
|
|
public byte[] AES_Key { get; private set; }
|
|
public byte[] AES_IV { get; private set; }
|
|
|
|
public bool CanDecrypt {
|
|
get { return simpleZipTypeDecryptMethod != null; }
|
|
}
|
|
|
|
public ResourceDecrypterInfo(ModuleDefMD module) {
|
|
this.module = module;
|
|
}
|
|
|
|
public ResourceDecrypterInfo(ModuleDefMD module, MethodDef simpleZipTypeDecryptMethod, ISimpleDeobfuscator simpleDeobfuscator)
|
|
: this(module) {
|
|
SetSimpleZipType(simpleZipTypeDecryptMethod, simpleDeobfuscator);
|
|
}
|
|
|
|
public void SetSimpleZipType(MethodDef method, ISimpleDeobfuscator simpleDeobfuscator) {
|
|
if (simpleZipTypeDecryptMethod != null || method == null)
|
|
return;
|
|
simpleZipTypeDecryptMethod = method;
|
|
Initialize(simpleDeobfuscator, method);
|
|
}
|
|
|
|
void Initialize(ISimpleDeobfuscator simpleDeobfuscator, MethodDef method) {
|
|
var desList = new List<byte[]>(2);
|
|
var aesList = new List<byte[]>(2);
|
|
|
|
var instructions = method.Body.Instructions;
|
|
simpleDeobfuscator.Deobfuscate(method);
|
|
for (int i = 0; i <= instructions.Count - 2; i++) {
|
|
var ldtoken = instructions[i];
|
|
if (ldtoken.OpCode.Code != Code.Ldtoken)
|
|
continue;
|
|
var field = DotNetUtils.GetField(module, ldtoken.Operand as IField);
|
|
if (field == null)
|
|
continue;
|
|
if (field.InitialValue == null)
|
|
continue;
|
|
|
|
var call = instructions[i + 1];
|
|
if (call.OpCode.Code != Code.Call)
|
|
continue;
|
|
var calledMethod = call.Operand as IMethod;
|
|
if (!DotNetUtils.IsMethod(calledMethod, "System.Void", "(System.Array,System.RuntimeFieldHandle)"))
|
|
continue;
|
|
|
|
if (field.InitialValue.Length == 8)
|
|
desList.Add(field.InitialValue);
|
|
else if (field.InitialValue.Length == 16)
|
|
aesList.Add(field.InitialValue);
|
|
}
|
|
|
|
if (desList.Count >= 2) {
|
|
DES_Key = desList[desList.Count - 2];
|
|
DES_IV = desList[desList.Count - 1];
|
|
}
|
|
if (aesList.Count >= 2) {
|
|
AES_Key = aesList[aesList.Count - 2];
|
|
AES_IV = aesList[aesList.Count - 1];
|
|
}
|
|
}
|
|
}
|
|
}
|