Locked de4dot .NET deobfuscator and unpacker

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Description

 

de4dot is an open source (GPLv3) .NET deobfuscator and unpacker written in C#. It will try its best to restore a packed and obfuscated assembly to almost the original assembly. Most of the obfuscation can be completely restored (eg. string encryption), but symbol renaming is impossible to restore since the original names aren't (usually) part of the obfuscated assembly.

Features

 

Here's a pseudo random list of the things it will do depending on what obfuscator was used to obfuscate an assembly:

 

 

 

Inline methods. Some obfuscators move small parts of a method to another static method and calls it.

Decrypt strings statically or dynamically

Decrypt other constants. Some obfuscators can also encrypt other constants, such as all integers, all doubles, etc.

Decrypt methods statically or dynamically

Remove proxy methods. Many obfuscators replace most/all call instructions with a call to a delegate. This delegate in turn calls the real method.

Rename symbols. Even though most symbols can't be restored, it will rename them to human readable strings. Sometimes, some of the original names can be restored, though.

Devirtualize virtualized code

Decrypt resources. Many obfuscators have an option to encrypt .NET resources.

Decrypt embedded files. Many obfuscators have an option to embed and possibly encrypt/compress other assemblies.

Remove tamper detection code

Remove anti-debug code

Control flow deobfuscation. Many obfuscators modify the IL code so it looks like spaghetti code making it very difficult to understand the code.

Restore class fields. Some obfuscators can move fields from one class to some other obfuscator created class.

Convert a PE exe to a .NET exe. Some obfuscators wrap a .NET assembly inside a Win32 PE so a .NET decompiler can't read the file.

Removes most/all junk classes added by the obfuscator.

Fixes some peverify errors. Many of the obfuscators are buggy and create unverifiable code by mistake.

Restore the types of method parameters and fields

Supported obfuscators/packers

 

Agile.NET (aka CliSecure)

Babel.NET

CodeFort

CodeVeil

CodeWall

CryptoObfuscator

DeepSea Obfuscator

Dotfuscator

.NET Reactor

Eazfuscator.NET

Goliath.NET

ILProtector

MaxtoCode

MPRESS

Rummage

Skater.NET

SmartAssembly

Spices.Net

Xenocode

 

Some of the above obfuscators are rarely used (eg. Goliath.NET), so they have had much less testing. Help me out by reporting bugs or problems you find.

 

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