/*
Copyright (C) 2011 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 .
*/
using System.Collections.Generic;
using Mono.Cecil;
namespace de4dot.code.deobfuscators.Xenocode {
public class DeobfuscatorInfo : DeobfuscatorInfoBase {
public const string THE_NAME = "Xenocode";
public const string THE_TYPE = "xc";
const string DEFAULT_REGEX = @"!^[oO01l]{4,}$&!^(get_|set_|add_|remove_|_)?x[a-f0-9]{16,}$&" + DeobfuscatorBase.DEFAULT_VALID_NAME_REGEX;
public DeobfuscatorInfo()
: base(DEFAULT_REGEX) {
}
public override string Name {
get { return THE_NAME; }
}
public override string Type {
get { return THE_TYPE; }
}
public override IDeobfuscator createDeobfuscator() {
return new Deobfuscator(new Deobfuscator.Options {
ValidNameRegex = validNameRegex.get(),
});
}
}
class Deobfuscator : DeobfuscatorBase {
bool foundXenocodeAttribute = false;
StringDecrypter stringDecrypter;
internal class Options : OptionsBase {
}
public override string Type {
get { return DeobfuscatorInfo.THE_TYPE; }
}
public override string TypeLong {
get { return DeobfuscatorInfo.THE_NAME; }
}
public override string Name {
get { return TypeLong; }
}
public Deobfuscator(Options options)
: base(options) {
}
protected override int detectInternal() {
int val = 0;
if (foundXenocodeAttribute || stringDecrypter.Detected)
val += 100;
if (foundXenocodeAttribute && stringDecrypter.Detected)
val += 10;
return val;
}
protected override void scanForObfuscator() {
findXenocodeAttribute();
stringDecrypter = new StringDecrypter(module);
stringDecrypter.find();
}
void findXenocodeAttribute() {
foreach (var type in module.Types) {
switch (type.FullName) {
case "Xenocode.Client.Attributes.AssemblyAttributes.ProcessedByXenocode":
case "Xenocode.Client.Attributes.AssemblyAttributes.SuppressDisassembly":
addAttributeToBeRemoved(type, "Obfuscator attribute");
foundXenocodeAttribute = true;
break;
}
}
}
public override void deobfuscateBegin() {
base.deobfuscateBegin();
staticStringDecrypter.add(stringDecrypter.Method, (method, args) => stringDecrypter.decrypt((string)args[0], (int)args[1]));
}
public override void deobfuscateEnd() {
if (Operations.DecryptStrings != OpDecryptString.None)
addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
base.deobfuscateEnd();
}
public override IEnumerable getStringDecrypterMethods() {
var list = new List();
if (stringDecrypter.Method != null)
list.Add(stringDecrypter.Method.MetadataToken.ToInt32().ToString("X8"));
return list;
}
}
}