136 lines
3.5 KiB
C#
136 lines
3.5 KiB
C#
/*
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Copyright (C) 2011-2012 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 Mono.Cecil;
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using Mono.MyStuff;
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using de4dot.blocks;
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using de4dot.PE;
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namespace de4dot.code.deobfuscators.CodeFort {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "CodeFort";
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public const string THE_TYPE = "cf";
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const string DEFAULT_REGEX = @"!^[_<>{}$.`-]$&" + 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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ValidNameRegex = validNameRegex.get(),
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});
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}
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protected override IEnumerable<Option> getOptionsInternal() {
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return new List<Option>() {
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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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ProxyCallFixer proxyCallFixer;
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StringDecrypter stringDecrypter;
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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 DeobfuscatorInfo.THE_NAME; }
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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(proxyCallFixer.Detected) +
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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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proxyCallFixer = new ProxyCallFixer(module);
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proxyCallFixer.findDelegateCreator();
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find();
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}
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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staticStringInliner.add(stringDecrypter.Method, (method, args) => stringDecrypter.decrypt((string)args[0]));
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DeobfuscatedFile.stringDecryptersAdded();
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proxyCallFixer.find();
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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proxyCallFixer.deobfuscate(blocks);
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inlineMethods(blocks);
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base.deobfuscateMethodEnd(blocks);
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}
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void inlineMethods(Blocks blocks) {
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var inliner = new CfMethodCallInliner();
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inliner.deobfuscateBegin(blocks);
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inliner.deobfuscate(blocks.MethodBlocks.getAllBlocks());
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}
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public override void deobfuscateEnd() {
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removeProxyDelegates(proxyCallFixer);
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if (CanRemoveStringDecrypterType)
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addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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base.deobfuscateEnd();
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}
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public override IEnumerable<int> getStringDecrypterMethods() {
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var list = new List<int>();
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if (stringDecrypter.Method != null)
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list.Add(stringDecrypter.Method.MetadataToken.ToInt32());
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return list;
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}
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}
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}
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