344 lines
11 KiB
C#
344 lines
11 KiB
C#
/*
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Copyright (C) 2011-2013 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 dnlib.IO;
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using dnlib.PE;
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using dnlib.DotNet;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Agile_NET {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "Agile.NET";
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public const string THE_TYPE = "an";
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const string DEFAULT_REGEX = @"[a-zA-Z_0-9>}$]$";
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BoolOption decryptMethods;
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BoolOption decryptResources;
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BoolOption removeStackFrameHelper;
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BoolOption restoreVmCode;
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BoolOption setInitLocals;
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public DeobfuscatorInfo()
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: base(DEFAULT_REGEX) {
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decryptMethods = new BoolOption(null, MakeArgName("methods"), "Decrypt methods", true);
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decryptResources = new BoolOption(null, MakeArgName("rsrc"), "Decrypt resources", true);
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removeStackFrameHelper = new BoolOption(null, MakeArgName("stack"), "Remove all StackFrameHelper code", true);
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restoreVmCode = new BoolOption(null, MakeArgName("vm"), "Restore VM code", true);
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setInitLocals = new BoolOption(null, MakeArgName("initlocals"), "Set initlocals in method header", 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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DecryptMethods = decryptMethods.get(),
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DecryptResources = decryptResources.get(),
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RemoveStackFrameHelper = removeStackFrameHelper.get(),
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RestoreVmCode = restoreVmCode.get(),
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SetInitLocals = setInitLocals.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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decryptMethods,
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decryptResources,
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removeStackFrameHelper,
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restoreVmCode,
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setInitLocals,
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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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List<TypeDef> cliSecureAttributes = new List<TypeDef>();
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ProxyCallFixer proxyCallFixer;
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CliSecureRtType cliSecureRtType;
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StringDecrypter stringDecrypter;
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ResourceDecrypter resourceDecrypter;
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StackFrameHelper stackFrameHelper;
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vm.v1.Csvm csvmV1;
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vm.v2.Csvm csvmV2;
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internal class Options : OptionsBase {
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public bool DecryptMethods { get; set; }
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public bool DecryptResources { get; set; }
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public bool RemoveStackFrameHelper { get; set; }
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public bool RestoreVmCode { get; set; }
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public bool SetInitLocals { 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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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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public override void Initialize(ModuleDefMD module) {
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base.Initialize(module);
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}
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public override byte[] UnpackNativeFile(IPEImage peImage) {
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return UnpackNativeFile1(peImage) ?? UnpackNativeFile2(peImage);
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}
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// Old CS versions
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byte[] UnpackNativeFile1(IPEImage peImage) {
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const int dataDirNum = 6; // debug dir
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const int dotNetDirNum = 14;
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var optHeader = peImage.ImageNTHeaders.OptionalHeader;
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if (optHeader.DataDirectories[dataDirNum].VirtualAddress == 0)
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return null;
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if (optHeader.DataDirectories[dataDirNum].Size != 0x48)
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return null;
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var fileData = peImage.GetImageAsByteArray();
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long dataDirBaseOffset = (long)optHeader.DataDirectories[0].StartOffset;
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int dataDir = (int)dataDirBaseOffset + dataDirNum * 8;
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int dotNetDir = (int)dataDirBaseOffset + dotNetDirNum * 8;
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WriteUInt32(fileData, dotNetDir, BitConverter.ToUInt32(fileData, dataDir));
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WriteUInt32(fileData, dotNetDir + 4, BitConverter.ToUInt32(fileData, dataDir + 4));
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WriteUInt32(fileData, dataDir, 0);
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WriteUInt32(fileData, dataDir + 4, 0);
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ModuleBytes = fileData;
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return fileData;
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}
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// CS 1.x
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byte[] UnpackNativeFile2(IPEImage peImage) {
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var data = peImage.FindWin32ResourceData("ASSEMBLY", 101, 0);
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if (data == null)
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return null;
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return ModuleBytes = data.Data.ReadAllBytes();
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}
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static void WriteUInt32(byte[] data, int offset, uint value) {
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data[offset] = (byte)value;
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data[offset + 1] = (byte)(value >> 8);
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data[offset + 2] = (byte)(value >> 16);
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data[offset + 3] = (byte)(value >> 24);
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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(cliSecureRtType.Detected) +
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ToInt32(stringDecrypter.Detected) +
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ToInt32(proxyCallFixer.Detected) +
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ToInt32(resourceDecrypter.Detected) +
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ToInt32(csvmV1.Detected) +
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ToInt32(csvmV2.Detected);
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if (sum > 0)
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val += 100 + 10 * (sum - 1);
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if (cliSecureAttributes.Count != 0)
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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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FindCliSecureAttribute();
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cliSecureRtType = new CliSecureRtType(module);
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cliSecureRtType.Find(ModuleBytes);
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stringDecrypter = new StringDecrypter(module, cliSecureRtType.StringDecrypterMethod);
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stringDecrypter.Find();
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resourceDecrypter = new ResourceDecrypter(module);
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resourceDecrypter.Find();
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proxyCallFixer = new ProxyCallFixer(module);
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proxyCallFixer.FindDelegateCreator();
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csvmV1 = new vm.v1.Csvm(DeobfuscatedFile.DeobfuscatorContext, module);
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csvmV1.Find();
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csvmV2 = new vm.v2.Csvm(DeobfuscatedFile.DeobfuscatorContext, module);
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csvmV2.Find();
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}
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void FindCliSecureAttribute() {
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obfuscatorName = "CliSecure";
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foreach (var type in module.Types) {
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if (Utils.StartsWith(type.FullName, "SecureTeam.Attributes.ObfuscatedByCliSecureAttribute", StringComparison.Ordinal)) {
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cliSecureAttributes.Add(type);
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obfuscatorName = "CliSecure";
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}
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else if (Utils.StartsWith(type.FullName, "SecureTeam.Attributes.ObfuscatedByAgileDotNetAttribute", StringComparison.Ordinal)) {
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cliSecureAttributes.Add(type);
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obfuscatorName = "Agile.NET";
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}
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}
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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 || !options.DecryptMethods)
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return false;
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byte[] fileData = ModuleBytes ?? DeobUtils.ReadModule(module);
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using (var peImage = new MyPEImage(fileData)) {
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if (!new MethodsDecrypter().Decrypt(peImage, module, cliSecureRtType, ref dumpedMethods)) {
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Logger.v("Methods aren't encrypted or invalid signature");
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return false;
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}
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}
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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.cliSecureAttributes = Lookup(module, cliSecureAttributes, "Could not find CliSecure attribute");
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newOne.cliSecureRtType = new CliSecureRtType(module, cliSecureRtType);
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newOne.stringDecrypter = new StringDecrypter(module, stringDecrypter);
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newOne.resourceDecrypter = new ResourceDecrypter(module, resourceDecrypter);
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newOne.proxyCallFixer = new ProxyCallFixer(module, proxyCallFixer);
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newOne.csvmV1 = new vm.v1.Csvm(DeobfuscatedFile.DeobfuscatorContext, module, csvmV1);
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newOne.csvmV2 = new vm.v2.Csvm(DeobfuscatedFile.DeobfuscatorContext, module, csvmV2);
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return newOne;
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}
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static List<TypeDef> Lookup(ModuleDefMD module, List<TypeDef> types, string errorMsg) {
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var list = new List<TypeDef>(types.Count);
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foreach (var type in types)
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list.Add(DeobUtils.Lookup(module, type, errorMsg));
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return list;
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}
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public override void DeobfuscateBegin() {
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base.DeobfuscateBegin();
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cliSecureRtType.FindStringDecrypterMethod();
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stringDecrypter.Method = cliSecureRtType.StringDecrypterMethod;
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AddAttributesToBeRemoved(cliSecureAttributes, "Obfuscator attribute");
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if (options.DecryptResources) {
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DecryptResources(resourceDecrypter);
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AddCctorInitCallToBeRemoved(resourceDecrypter.RsrcRrrMethod);
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}
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stackFrameHelper = new StackFrameHelper(module);
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stackFrameHelper.Find();
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foreach (var type in module.Types) {
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if (type.FullName == "InitializeDelegate" && DotNetUtils.DerivesFromDelegate(type))
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this.AddTypeToBeRemoved(type, "Obfuscator type");
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}
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proxyCallFixer.Find();
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staticStringInliner.Add(stringDecrypter.Method, (method, gim, args) => stringDecrypter.Decrypt((string)args[0]));
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DeobfuscatedFile.StringDecryptersAdded();
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if (options.DecryptMethods) {
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AddCctorInitCallToBeRemoved(cliSecureRtType.InitializeMethod);
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AddCctorInitCallToBeRemoved(cliSecureRtType.PostInitializeMethod);
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FindPossibleNamesToRemove(cliSecureRtType.LoadMethod);
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}
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if (options.RestoreVmCode && (csvmV1.Detected || csvmV2.Detected)) {
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if (csvmV1.Detected && csvmV1.Restore())
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AddResourceToBeRemoved(csvmV1.Resource, "CSVM data resource");
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else if (csvmV2.Detected && csvmV2.Restore())
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AddResourceToBeRemoved(csvmV2.Resource, "CSVM data resource");
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else {
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Logger.e("Couldn't restore VM methods. Use --dont-rename or it will not run");
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PreserveTokensAndTypes();
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}
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}
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}
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void DecryptResources(ResourceDecrypter resourceDecrypter) {
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var rsrc = resourceDecrypter.MergeResources();
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if (rsrc == null)
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return;
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AddResourceToBeRemoved(rsrc, "Encrypted resources");
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AddTypeToBeRemoved(resourceDecrypter.Type, "Resource decrypter type");
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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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RemoveStackFrameHelperCode(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.SetInitLocals)
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SetInitLocals();
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RemoveProxyDelegates(proxyCallFixer);
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if (options.RemoveStackFrameHelper) {
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if (stackFrameHelper.ExceptionLoggerRemover.NumRemovedExceptionLoggers > 0)
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AddTypeToBeRemoved(stackFrameHelper.Type, "StackFrameHelper type");
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}
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if (CanRemoveStringDecrypterType) {
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AddTypeToBeRemoved(stringDecrypter.Type, "String decrypter type");
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if (options.DecryptMethods)
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AddTypeToBeRemoved(cliSecureRtType.Type, "Obfuscator type");
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}
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if (options.DecryptMethods) {
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AddResources("Obfuscator protection files");
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}
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base.DeobfuscateEnd();
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// Call hasNativeMethods() after all types/methods/etc have been removed since
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// some of the removed methods could be native methods
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if (!module.IsILOnly && !HasNativeMethods())
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module.IsILOnly = true;
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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.MDToken.ToInt32());
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return list;
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}
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void RemoveStackFrameHelperCode(Blocks blocks) {
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if (!options.RemoveStackFrameHelper)
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return;
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if (stackFrameHelper.ExceptionLoggerRemover.Remove(blocks))
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Logger.v("Removed StackFrameHelper code");
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}
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}
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}
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