544 lines
16 KiB
C#
544 lines
16 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 Mono.Cecil;
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using Mono.Cecil.Cil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Eazfuscator_NET {
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public class DeobfuscatorInfo : DeobfuscatorInfoBase {
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public const string THE_NAME = "Eazfuscator.NET";
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public const string THE_TYPE = "ef";
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const string DEFAULT_REGEX = @"!^#=&!^dje_.+_ejd$&" + 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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}
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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 detectedVersion = false;
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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 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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protected override int detectInternal() {
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int val = 0;
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if (stringDecrypter.Detected)
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val += 100;
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if (detectedVersion)
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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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stringDecrypter = new StringDecrypter(module);
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stringDecrypter.find(DeobfuscatedFile);
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if (stringDecrypter.Detected)
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detectVersion();
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}
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void detectVersion() {
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var name = detectVersion2();
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if (name == null)
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return;
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detectedVersion = true;
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obfuscatorName = DeobfuscatorInfo.THE_NAME + " " + name;
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}
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string detectVersion2() {
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var decryptStringType = stringDecrypter.Type;
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var decryptStringMethod = stringDecrypter.Method;
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if (decryptStringType == null || decryptStringMethod == null)
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return null;
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var otherMethods = new List<MethodDefinition>();
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MethodDefinition cctor = null;
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foreach (var method in decryptStringType.Methods) {
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if (method == decryptStringMethod)
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continue;
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if (method.Name == ".cctor")
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cctor = method;
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else
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otherMethods.Add(method);
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}
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if (cctor == null)
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return null;
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields11 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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};
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var locals11 = new string[] {
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"System.Boolean",
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"System.Byte[]",
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"System.Char[]",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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!decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 35 &&
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decryptStringMethod.Body.MaxStackSize <= 50 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 0 &&
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new LocalTypes(decryptStringMethod).exactly(locals11) &&
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checkTypeFields(fields11)) {
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return "1.1 - 1.2";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields13 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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};
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var locals13 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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!decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 35 &&
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decryptStringMethod.Body.MaxStackSize <= 50 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 0 &&
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new LocalTypes(decryptStringMethod).exactly(locals13) &&
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checkTypeFields(fields13)) {
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return "1.3";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields14 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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};
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var locals14 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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!decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 150 &&
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decryptStringMethod.Body.MaxStackSize <= 200 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 0 &&
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new LocalTypes(decryptStringMethod).exactly(locals14) &&
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checkTypeFields(fields14)) {
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return "1.4 - 2.3";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields24 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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};
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var locals24 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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!decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 0 &&
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new LocalTypes(decryptStringMethod).exactly(locals24) &&
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checkTypeFields(fields24)) {
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return "2.4 - 2.5";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields26 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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};
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var locals26 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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!decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 1 &&
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new LocalTypes(decryptStringMethod).exactly(locals26) &&
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checkTypeFields(fields26)) {
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return "2.6";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields27 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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};
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var locals27 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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decryptStringMethod.NoInlining &&
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decryptStringMethod.IsPublic &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 1 &&
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new LocalTypes(decryptStringMethod).exactly(locals27) &&
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checkTypeFields(fields27)) {
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return "2.7";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields28 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Boolean",
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"System.Byte[]",
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"System.Boolean",
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};
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var locals28 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Int16",
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"System.Int32",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.String",
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};
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if (otherMethods.Count == 0 &&
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decryptStringMethod.NoInlining &&
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decryptStringMethod.IsAssembly &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 1 &&
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new LocalTypes(decryptStringMethod).exactly(locals28) &&
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checkTypeFields(fields28)) {
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return "2.8";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields29 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Int32",
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"System.Byte[]",
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};
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var locals29 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Diagnostics.StackFrame",
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"System.Diagnostics.StackTrace",
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"System.Int16",
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"System.Int32",
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"System.IO.Stream",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.Reflection.MethodBase",
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"System.String",
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"System.Type",
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};
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if (otherMethods.Count == 0 &&
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decryptStringMethod.NoInlining &&
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decryptStringMethod.IsAssembly &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 2 &&
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new LocalTypes(decryptStringMethod).exactly(locals29) &&
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checkTypeFields(fields29)) {
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return "2.9";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields30 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Int32",
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"System.Byte[]",
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};
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var locals30 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Diagnostics.StackFrame",
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"System.Diagnostics.StackTrace",
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"System.Int16",
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"System.Int32",
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"System.IO.Stream",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.Reflection.MethodBase",
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"System.String",
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"System.Type",
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};
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var olocals30 = new string[] {
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"System.Int32",
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};
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if (otherMethods.Count == 1 &&
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DotNetUtils.isMethod(otherMethods[0], "System.Int32", "(System.Byte[],System.Int32,System.Byte[])") &&
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otherMethods[0].IsPrivate &&
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otherMethods[0].IsStatic &&
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new LocalTypes(otherMethods[0]).exactly(olocals30) &&
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decryptStringMethod.NoInlining &&
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decryptStringMethod.IsAssembly &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 2 &&
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new LocalTypes(decryptStringMethod).exactly(locals30) &&
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checkTypeFields(fields30)) {
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return "3.0 - 3.1";
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}
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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/////////////////////////////////////////////////////////////////
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var fields32 = new string[] {
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.IO.BinaryReader",
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"System.Byte[]",
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"System.Int16",
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"System.Int32",
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"System.Byte[]",
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"System.Int32",
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};
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var locals32 = new string[] {
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"System.Boolean",
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"System.Byte",
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"System.Byte[]",
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"System.Char[]",
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"System.Collections.Generic.Dictionary`2<System.Int32,System.String>",
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"System.Diagnostics.StackFrame",
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"System.Diagnostics.StackTrace",
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"System.Int16",
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"System.Int32",
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"System.Int64",
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"System.IO.Stream",
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"System.Reflection.Assembly",
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"System.Reflection.AssemblyName",
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"System.Reflection.MethodBase",
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"System.String",
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"System.Type",
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};
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var olocals32 = new string[] {
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"System.Int32",
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};
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if (otherMethods.Count == 1 &&
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DotNetUtils.isMethod(otherMethods[0], "System.Void", "(System.Byte[],System.Int32,System.Byte[])") &&
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otherMethods[0].IsPrivate &&
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otherMethods[0].IsStatic &&
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new LocalTypes(otherMethods[0]).exactly(olocals32) &&
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decryptStringMethod.NoInlining &&
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decryptStringMethod.IsAssembly &&
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!decryptStringMethod.IsSynchronized &&
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decryptStringMethod.Body.MaxStackSize >= 1 &&
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decryptStringMethod.Body.MaxStackSize <= 8 &&
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decryptStringMethod.Body.ExceptionHandlers.Count == 2 &&
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new LocalTypes(decryptStringMethod).exactly(locals32) &&
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checkTypeFields(fields32)) {
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return "3.2";
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}
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return null;
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}
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bool checkTypeFields(string[] fieldTypes) {
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if (fieldTypes.Length != stringDecrypter.Type.Fields.Count)
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return false;
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for (int i = 0; i < fieldTypes.Length; i++) {
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if (fieldTypes[i] != stringDecrypter.Type.Fields[i].FieldType.FullName)
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return false;
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}
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return true;
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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, (method2, args) => {
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return stringDecrypter.decrypt((int)args[0]);
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});
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DeobfuscatedFile.stringDecryptersAdded();
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}
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public override void deobfuscateEnd() {
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if (CanRemoveStringDecrypterType) {
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addTypesToBeRemoved(stringDecrypter.Types, "String decrypter type");
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addResourceToBeRemoved(stringDecrypter.Resource, "Encrypted strings");
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}
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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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