346 lines
11 KiB
C#
346 lines
11 KiB
C#
/*
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Copyright (C) 2011-2014 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 System.IO;
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using System.Text.RegularExpressions;
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using dnlib.IO;
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using dnlib.PE;
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using dnlib.DotNet;
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using dnlib.DotNet.Emit;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.dotNET_Reactor.v3 {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = ".NET Reactor";
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public const string THE_TYPE = "dr3";
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const string DEFAULT_REGEX = DeobfuscatorBase.DEFAULT_ASIAN_VALID_NAME_REGEX;
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BoolOption restoreTypes;
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BoolOption inlineMethods;
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BoolOption removeInlinedMethods;
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BoolOption removeNamespaces;
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BoolOption removeAntiStrongName;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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restoreTypes = new BoolOption(null, MakeArgName("types"), "Restore types (object -> real type)", true);
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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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removeAntiStrongName = new BoolOption(null, MakeArgName("sn"), "Remove anti strong name code", 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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RestoreTypes = restoreTypes.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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RemoveAntiStrongName = removeAntiStrongName.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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restoreTypes,
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inlineMethods,
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removeInlinedMethods,
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removeNamespaces,
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removeAntiStrongName,
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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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DecrypterType decrypterType;
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NativeLibSaver nativeLibSaver;
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AntiStrongName antiStrongName;
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LibAssemblyResolver libAssemblyResolver;
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List<UnpackedFile> unpackedFiles = new List<UnpackedFile>();
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bool unpackedNativeFile = false;
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bool canRemoveDecrypterType = true;
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bool startedDeobfuscating = false;
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internal class Options : OptionsBase {
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public bool RestoreTypes { get; set; }
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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 RemoveAntiStrongName { 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 + " 3.x"; }
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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 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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public override byte[] UnpackNativeFile(IPEImage peImage) {
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var unpacker = new ApplicationModeUnpacker(peImage);
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var data = unpacker.Unpack();
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if (data == null)
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return null;
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unpackedFiles.AddRange(unpacker.EmbeddedAssemblies);
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unpackedNativeFile = true;
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ModuleBytes = data;
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return data;
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}
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bool NeedsPatching() {
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return decrypterType.LinkedResource != null || nativeLibSaver.Resource != null;
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}
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public override bool GetDecryptedModule(int count, ref byte[] newFileData, ref DumpedMethods dumpedMethods) {
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if (count != 0 || !NeedsPatching())
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return false;
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var fileData = ModuleBytes ?? DeobUtils.ReadModule(module);
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if (!decrypterType.Patch(fileData))
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return false;
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newFileData = fileData;
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return true;
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}
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public override IDeobfuscator ModuleReloaded(ModuleDefMD module) {
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var newOne = new Deobfuscator(options);
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newOne.SetModule(module);
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newOne.decrypterType = new DecrypterType(module, decrypterType);
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newOne.nativeLibSaver = new NativeLibSaver(module, nativeLibSaver);
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return newOne;
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}
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public override void Initialize(ModuleDefMD module) {
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base.Initialize(module);
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}
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static Regex isRandomName = new Regex(@"^[A-Z]{30,40}$");
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static Regex isRandomNameMembers = new Regex(@"^[a-zA-Z0-9]{9,11}$"); // methods, fields, props, events
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static Regex isRandomNameTypes = new Regex(@"^[a-zA-Z0-9]{18,19}(?:`\d+)?$"); // types, namespaces
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bool CheckValidName(string name, Regex regex) {
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if (isRandomName.IsMatch(name))
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return false;
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if (regex.IsMatch(name)) {
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if (RandomNameChecker.IsRandom(name))
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return false;
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if (!RandomNameChecker.IsNonRandom(name))
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return false;
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}
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return CheckValidName(name);
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}
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public override bool IsValidNamespaceName(string ns) {
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if (ns == null)
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return false;
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if (ns.Contains("."))
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return base.IsValidNamespaceName(ns);
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return CheckValidName(ns, isRandomNameTypes);
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}
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public override bool IsValidTypeName(string name) {
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return name != null && CheckValidName(name, isRandomNameTypes);
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}
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public override bool IsValidMethodName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidPropertyName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidEventName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidFieldName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidGenericParamName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidMethodArgName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidMethodReturnArgName(string name) {
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return string.IsNullOrEmpty(name) || CheckValidName(name, isRandomNameMembers);
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}
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public override bool IsValidResourceKeyName(string name) {
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return name != null && CheckValidName(name, isRandomNameMembers);
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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(unpackedNativeFile) +
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ToInt32(decrypterType.Detected) +
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ToInt32(nativeLibSaver.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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decrypterType = new DecrypterType(module);
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decrypterType.Find();
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nativeLibSaver = new NativeLibSaver(module);
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nativeLibSaver.Find();
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obfuscatorName = DetectVersion();
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if (unpackedNativeFile)
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obfuscatorName += " (native)";
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}
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string DetectVersion() {
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return DeobfuscatorInfo.THE_NAME + " 3.x";
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}
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public override void DeobfuscateBegin() {
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base.DeobfuscateBegin();
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antiStrongName = new AntiStrongName();
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staticStringInliner.Add(decrypterType.StringDecrypter1, (method2, gim, args) => {
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return decrypterType.Decrypt1((string)args[0]);
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});
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staticStringInliner.Add(decrypterType.StringDecrypter2, (method2, gim, args) => {
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return decrypterType.Decrypt2((string)args[0]);
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});
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DeobfuscatedFile.StringDecryptersAdded();
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libAssemblyResolver = new LibAssemblyResolver(module);
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libAssemblyResolver.Find(DeobfuscatedFile, this);
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if (Operations.DecryptStrings == OpDecryptString.None)
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canRemoveDecrypterType = false;
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RemoveInitCall(nativeLibSaver.InitMethod);
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AddResourceToBeRemoved(nativeLibSaver.Resource, "Native lib resource");
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AddTypeToBeRemoved(nativeLibSaver.Type, "Native lib saver type");
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foreach (var initMethod in decrypterType.InitMethods)
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RemoveInitCall(initMethod);
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DumpUnpackedFiles();
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DumpResourceFiles();
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startedDeobfuscating = true;
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}
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void RemoveInitCall(MethodDef initMethod) {
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AddCctorInitCallToBeRemoved(initMethod);
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AddCtorInitCallToBeRemoved(initMethod);
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}
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void DumpUnpackedFiles() {
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foreach (var unpackedFile in unpackedFiles)
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DeobfuscatedFile.CreateAssemblyFile(unpackedFile.data,
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Win32Path.GetFileNameWithoutExtension(unpackedFile.filename),
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Win32Path.GetExtension(unpackedFile.filename));
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}
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void DumpResourceFiles() {
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foreach (var resource in libAssemblyResolver.Resources) {
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var mod = ModuleDefMD.Load(resource.Data.ReadAllBytes());
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AddResourceToBeRemoved(resource, string.Format("Embedded assembly: {0}", mod.Assembly.FullName));
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DeobfuscatedFile.CreateAssemblyFile(resource.GetResourceData(),
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Utils.GetAssemblySimpleName(mod.Assembly.FullName),
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DeobUtils.GetExtension(mod.Kind));
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}
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RemoveInitCall(libAssemblyResolver.InitMethod);
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AddCallToBeRemoved(module.EntryPoint, libAssemblyResolver.InitMethod);
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AddTypeToBeRemoved(libAssemblyResolver.Type, "Assembly resolver type (library mode)");
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}
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public override void DeobfuscateMethodEnd(Blocks blocks) {
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if (options.RemoveAntiStrongName) {
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if (antiStrongName.Remove(blocks))
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Logger.v("Removed Anti Strong Name code");
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}
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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.RestoreTypes)
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new TypesRestorer(module).Deobfuscate();
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if (canRemoveDecrypterType && !IsTypeCalled(decrypterType.Type)) {
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AddTypeToBeRemoved(decrypterType.Type, "Decrypter type");
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AddResourceToBeRemoved(decrypterType.LinkedResource, "Native lib linked resource");
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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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FindAndRemoveInlinedMethods();
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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 decrypterType.StringDecrypters)
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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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