301 lines
9.8 KiB
C#
301 lines
9.8 KiB
C#
/*
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Copyright (C) 2011-2015 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 dnlib.DotNet;
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using de4dot.blocks;
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using de4dot.blocks.cflow;
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namespace de4dot.code.deobfuscators.DeepSea {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "DeepSea";
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public const string THE_TYPE = "ds";
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const string DEFAULT_REGEX = DeobfuscatorBase.DEFAULT_ASIAN_VALID_NAME_REGEX;
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BoolOption inlineMethods;
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BoolOption removeInlinedMethods;
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BoolOption decryptResources;
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BoolOption dumpEmbeddedAssemblies;
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BoolOption restoreFields;
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BoolOption renameResourceKeys;
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BoolOption castDeobfuscation;
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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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decryptResources = new BoolOption(null, MakeArgName("rsrc"), "Decrypt resources", true);
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dumpEmbeddedAssemblies = new BoolOption(null, MakeArgName("embedded"), "Dump embedded assemblies", true);
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restoreFields = new BoolOption(null, MakeArgName("fields"), "Restore fields", true);
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renameResourceKeys = new BoolOption(null, MakeArgName("keys"), "Rename resource keys", true);
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castDeobfuscation = new BoolOption(null, MakeArgName("casts"), "Deobfuscate casts", 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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DecryptResources = decryptResources.Get(),
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DumpEmbeddedAssemblies = dumpEmbeddedAssemblies.Get(),
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RestoreFields = restoreFields.Get(),
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RenameResourceKeys = renameResourceKeys.Get(),
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CastDeobfuscation = castDeobfuscation.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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decryptResources,
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dumpEmbeddedAssemblies,
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restoreFields,
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renameResourceKeys,
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castDeobfuscation,
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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 = DeobfuscatorInfo.THE_NAME;
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bool startedDeobfuscating = false;
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StringDecrypter stringDecrypter;
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ResourceResolver resourceResolver;
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AssemblyResolver assemblyResolver;
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FieldsRestorer fieldsRestorer;
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ArrayBlockState arrayBlockState;
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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 DecryptResources { get; set; }
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public bool DumpEmbeddedAssemblies { get; set; }
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public bool RestoreFields { get; set; }
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public bool RenameResourceKeys { get; set; }
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public bool CastDeobfuscation { 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 obfuscatorName; }
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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>(GetBlocksDeobfuscators());
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if (CanInlineMethods)
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list.Add(new DsMethodCallInliner(new CachedCflowDeobfuscator(GetBlocksDeobfuscators())));
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return list;
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}
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}
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List<IBlocksDeobfuscator> GetBlocksDeobfuscators() {
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var list = new List<IBlocksDeobfuscator>();
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if (arrayBlockState != null && arrayBlockState.Detected)
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list.Add(new ArrayBlockDeobfuscator(arrayBlockState));
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if (!startedDeobfuscating || options.CastDeobfuscation)
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list.Add(new CastDeobfuscator());
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return list;
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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.RenameResourceKeys)
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this.RenamingOptions |= RenamingOptions.RenameResourceKeys;
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else
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this.RenamingOptions &= ~RenamingOptions.RenameResourceKeys;
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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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ToInt32(resourceResolver.Detected) +
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ToInt32(assemblyResolver.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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staticStringInliner.UseUnknownArgs = true;
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arrayBlockState = new ArrayBlockState(module);
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arrayBlockState.Initialize(DeobfuscatedFile);
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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.Find(DeobfuscatedFile);
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resourceResolver = new ResourceResolver(module, DeobfuscatedFile, this);
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resourceResolver.Find();
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assemblyResolver = new AssemblyResolver(module, DeobfuscatedFile, this);
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assemblyResolver.Find();
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obfuscatorName = DetectVersion();
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}
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string DetectVersion() {
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switch (stringDecrypter.Version) {
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case StringDecrypter.DecrypterVersion.V1_3:
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if (DetectMethodProxyObfuscation())
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return DeobfuscatorInfo.THE_NAME + " 3.5";
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return DeobfuscatorInfo.THE_NAME + " 1.x-3.x";
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case StringDecrypter.DecrypterVersion.V4_0:
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return DeobfuscatorInfo.THE_NAME + " 4.0";
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case StringDecrypter.DecrypterVersion.V4_1:
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return DeobfuscatorInfo.THE_NAME + " 4.1";
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}
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return DeobfuscatorInfo.THE_NAME;
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}
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bool DetectMethodProxyObfuscation() {
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const int MIN_FOUND_PROXIES = 10;
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int foundProxies = 0, checkedMethods = 0;
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foreach (var type in module.GetTypes()) {
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foreach (var method in type.Methods) {
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if (foundProxies >= MIN_FOUND_PROXIES)
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goto done;
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if (!method.IsStatic || method.Body == null)
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continue;
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if (checkedMethods++ >= 1000)
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goto done;
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if (!DsMethodCallInliner.CanInline(method))
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continue;
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foundProxies++;
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}
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}
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done:
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return foundProxies >= MIN_FOUND_PROXIES;
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}
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public override void DeobfuscateBegin() {
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base.DeobfuscateBegin();
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if (options.RestoreFields) {
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fieldsRestorer = new FieldsRestorer(module);
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fieldsRestorer.Initialize();
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}
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foreach (var method in stringDecrypter.DecrypterMethods) {
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staticStringInliner.Add(method, (method2, gim, args) => {
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return stringDecrypter.Decrypt(method2, args);
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});
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}
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DeobfuscatedFile.StringDecryptersAdded();
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resourceResolver.Initialize();
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DecryptResources();
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DumpEmbeddedAssemblies();
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startedDeobfuscating = true;
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}
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void DecryptResources() {
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if (!options.DecryptResources)
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return;
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EmbeddedResource rsrc;
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if (!resourceResolver.MergeResources(out rsrc))
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return;
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AddResourceToBeRemoved(rsrc, "Encrypted resources");
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AddCctorInitCallToBeRemoved(resourceResolver.InitMethod);
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AddCallToBeRemoved(module.EntryPoint, resourceResolver.InitMethod);
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AddMethodToBeRemoved(resourceResolver.InitMethod, "Resource resolver init method");
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AddMethodToBeRemoved(resourceResolver.InitMethod2, "Resource resolver init method #2");
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AddMethodToBeRemoved(resourceResolver.HandlerMethod, "Resource resolver handler method");
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AddMethodToBeRemoved(resourceResolver.GetDataMethod, "Resource resolver 'get resource data' method");
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}
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void DumpEmbeddedAssemblies() {
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if (!options.DumpEmbeddedAssemblies)
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return;
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foreach (var info in assemblyResolver.GetAssemblyInfos()) {
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if (info.resource != null && info.resource == resourceResolver.Resource)
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continue;
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DeobfuscatedFile.CreateAssemblyFile(info.data, info.simpleName, info.extension);
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AddResourceToBeRemoved(info.resource, string.Format("Embedded assembly: {0}", info.fullName));
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}
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AddCctorInitCallToBeRemoved(assemblyResolver.InitMethod);
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AddCallToBeRemoved(module.EntryPoint, assemblyResolver.InitMethod);
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AddMethodToBeRemoved(assemblyResolver.InitMethod, "Assembly resolver init method");
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AddMethodToBeRemoved(assemblyResolver.HandlerMethod, "Assembly resolver handler method");
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AddMethodToBeRemoved(assemblyResolver.DecryptMethod, "Assembly resolver decrypt method");
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}
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public override void DeobfuscateMethodEnd(Blocks blocks) {
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if (options.RestoreFields)
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fieldsRestorer.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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if (options.RestoreFields && CanRemoveTypes)
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fieldsRestorer.CleanUp();
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RemoveInlinedMethods();
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if (options.RestoreFields)
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AddTypesToBeRemoved(fieldsRestorer.FieldStructs, "Type with moved fields");
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if (CanRemoveStringDecrypterType) {
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AddMethodsToBeRemoved(stringDecrypter.DecrypterMethods, "String decrypter method");
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stringDecrypter.CleanUp();
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}
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AddFieldsToBeRemoved(arrayBlockState.CleanUp(), "Control flow obfuscation array");
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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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RemoveInlinedMethods(DsInlinedMethodsFinder.Find(module, staticStringInliner.Methods));
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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 method in stringDecrypter.DecrypterMethods)
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list.Add(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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