221 lines
6.6 KiB
C#
221 lines
6.6 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.Collections.Generic;
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using dot10.DotNet;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.Spices_Net {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "Spices.Net";
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public const string THE_TYPE = "sn";
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const string DEFAULT_REGEX = @"!^[a-zA-Z0-9]{1,2}$&" + DeobfuscatorBase.DEFAULT_VALID_NAME_REGEX;
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BoolOption inlineMethods;
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BoolOption removeInlinedMethods;
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BoolOption removeNamespaces;
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BoolOption restoreResourceNames;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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inlineMethods = new BoolOption(null, makeArgName("inline"), "Inline short methods", true);
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removeInlinedMethods = new BoolOption(null, makeArgName("remove-inlined"), "Remove inlined methods", true);
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removeNamespaces = new BoolOption(null, makeArgName("ns1"), "Clear namespace if there's only one class in it", true);
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restoreResourceNames = new BoolOption(null, makeArgName("rsrc"), "Restore resource names", true);
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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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InlineMethods = inlineMethods.get(),
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RemoveInlinedMethods = removeInlinedMethods.get(),
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RemoveNamespaces = removeNamespaces.get(),
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RestoreResourceNames = restoreResourceNames.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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inlineMethods,
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removeInlinedMethods,
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removeNamespaces,
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restoreResourceNames,
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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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bool foundSpicesAttribute = false;
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bool startedDeobfuscating = false;
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StringDecrypter stringDecrypter;
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SpicesMethodCallInliner methodCallInliner;
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ResourceNamesRestorer resourceNamesRestorer;
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internal class Options : OptionsBase {
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public bool InlineMethods { get; set; }
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public bool RemoveInlinedMethods { get; set; }
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public bool RemoveNamespaces { get; set; }
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public bool RestoreResourceNames { get; set; }
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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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protected override bool CanInlineMethods {
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get { return startedDeobfuscating ? options.InlineMethods : true; }
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}
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public override IEnumerable<IBlocksDeobfuscator> BlocksDeobfuscators {
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get {
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var list = new List<IBlocksDeobfuscator>();
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if (CanInlineMethods)
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list.Add(methodCallInliner);
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return list;
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}
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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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if (options.RemoveNamespaces)
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this.RenamingOptions |= RenamingOptions.RemoveNamespaceIfOneType;
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else
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this.RenamingOptions &= ~RenamingOptions.RemoveNamespaceIfOneType;
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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(stringDecrypter.Detected);
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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if (foundSpicesAttribute)
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val += 10;
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return val;
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}
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protected override void scanForObfuscator() {
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methodCallInliner = new SpicesMethodCallInliner(module);
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find();
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findSpicesAttributes();
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}
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void findSpicesAttributes() {
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foreach (var type in module.Types) {
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switch (type.FullName) {
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case "NineRays.Decompiler.NotDecompile":
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case "NineRays.Obfuscator.Evaluation":
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addAttributeToBeRemoved(type, "Obfuscator attribute");
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foundSpicesAttribute = true;
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break;
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}
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}
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}
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public override void deobfuscateBegin() {
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base.deobfuscateBegin();
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methodCallInliner.initialize();
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if (options.RestoreResourceNames) {
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resourceNamesRestorer = new ResourceNamesRestorer(module);
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resourceNamesRestorer.find();
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resourceNamesRestorer.renameResources();
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}
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stringDecrypter.initialize();
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foreach (var info in stringDecrypter.DecrypterInfos) {
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staticStringInliner.add(info.method, (method2, gim, args) => {
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return stringDecrypter.decrypt(method2);
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});
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}
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DeobfuscatedFile.stringDecryptersAdded();
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startedDeobfuscating = true;
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}
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public override void deobfuscateMethodEnd(Blocks blocks) {
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methodCallInliner.deobfuscate(blocks);
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if (options.RestoreResourceNames)
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resourceNamesRestorer.deobfuscate(blocks);
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base.deobfuscateMethodEnd(blocks);
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}
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public override void deobfuscateEnd() {
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removeInlinedMethods();
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if (options.RestoreResourceNames) {
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addTypeToBeRemoved(resourceNamesRestorer.ResourceManagerType, "Obfuscator ResourceManager type");
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addTypeToBeRemoved(resourceNamesRestorer.ComponentResourceManagerType, "Obfuscator ComponentResourceManager type");
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}
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if (Operations.DecryptStrings != OpDecryptString.None) {
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addTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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addTypeToBeRemoved(stringDecrypter.EncryptedStringsType, "Encrypted strings field type");
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stringDecrypter.cleanUp();
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}
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base.deobfuscateEnd();
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}
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void removeInlinedMethods() {
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if (!options.InlineMethods || !options.RemoveInlinedMethods)
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return;
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var unusedMethods = new UnusedMethodsFinder(module, methodCallInliner.getInlinedMethods(), getRemovedMethods()).find();
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var removedTypes = methodCallInliner.getInlinedTypes(unusedMethods);
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addTypesToBeRemoved(removedTypes.getKeys(), "Obfuscator methods type");
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foreach (var method in unusedMethods) {
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if (!removedTypes.find(method.DeclaringType))
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addMethodToBeRemoved(method, "Inlined method");
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}
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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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foreach (var info in stringDecrypter.DecrypterInfos)
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list.Add(info.method.MDToken.ToInt32());
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return list;
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}
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}
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}
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