136 lines
3.7 KiB
C#
136 lines
3.7 KiB
C#
/*
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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.Collections.Generic;
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using Mono.Cecil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Dotfuscator {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "Dotfuscator";
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public const string THE_TYPE = "df";
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const string DEFAULT_REGEX = @"!^[a-z][a-z0-9]{0,2}$&!^A_[0-9]+$&" + DeobfuscatorBase.DEFAULT_VALID_NAME_REGEX;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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}
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public override string Name {
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get { return THE_NAME; }
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}
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public override string Type {
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get { return THE_TYPE; }
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}
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public override IDeobfuscator createDeobfuscator() {
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return new Deobfuscator(new Deobfuscator.Options {
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RenameResourcesInCode = false,
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ValidNameRegex = validNameRegex.get(),
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});
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}
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}
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class Deobfuscator : DeobfuscatorBase {
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Options options;
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string obfuscatorName = "Dotfuscator";
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StringDecrypter stringDecrypter;
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bool foundDotfuscatorAttribute = false;
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internal class Options : OptionsBase {
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}
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public override string Type {
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get { return DeobfuscatorInfo.THE_TYPE; }
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}
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public override string TypeLong {
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get { return DeobfuscatorInfo.THE_NAME; }
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}
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public override string Name {
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get { return obfuscatorName; }
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}
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public Deobfuscator(Options options)
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: base(options) {
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this.options = options;
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}
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protected override int detectInternal() {
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int val = 0;
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int sum = toInt32(foundDotfuscatorAttribute) +
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toInt32(stringDecrypter.Detected);
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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return val;
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}
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protected override void scanForObfuscator() {
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find(DeobfuscatedFile);
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findDotfuscatorAttribute();
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}
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void findDotfuscatorAttribute() {
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foreach (var type in module.Types) {
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if (type.FullName == "DotfuscatorAttribute") {
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foundDotfuscatorAttribute = true;
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addAttributeToBeRemoved(type, "Obfuscator attribute");
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initializeVersion(type);
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return;
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}
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}
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}
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void initializeVersion(TypeDefinition attr) {
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var s = DotNetUtils.getCustomArgAsString(getAssemblyAttribute(attr), 0);
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if (s == null)
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return;
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var val = System.Text.RegularExpressions.Regex.Match(s, @"^(\d+(?::\d+)*\.\d+(?:\.\d+)*)$");
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if (val.Groups.Count < 2)
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return;
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obfuscatorName = "Dotfuscator " + val.Groups[1].ToString();
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}
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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foreach (var info in stringDecrypter.StringDecrypterInfos)
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staticStringDecrypter.add(info.method, (method, args) => stringDecrypter.decrypt(method, (string)args[0], (int)args[1]));
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}
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public override void deobfuscateEnd() {
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if (Operations.DecryptStrings != OpDecryptString.None)
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addMethodsToBeRemoved(stringDecrypter.StringDecrypters, "String decrypter method");
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base.deobfuscateEnd();
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}
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public override IEnumerable<string> getStringDecrypterMethods() {
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var list = new List<string>();
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foreach (var method in stringDecrypter.StringDecrypters)
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list.Add(method.MetadataToken.ToInt32().ToString("X8"));
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return list;
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}
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}
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}
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