A lightweight C# obfuscation tool for .NET applications.

(It was created for a proprietary project called Simorgh, a clone of Logicube Falcon device.)

It supports obfuscating .cs source files, .dll libraries, and .exe executables to prevent reverse engineering and tampering.

• String encryption: Encodes all string literals to make them unreadable without execution.
• Dead code injection: Adds meaningless methods to distract reverse engineers.
• Anti-Debugging mechanism: Detects attached debuggers and prevents execution.

• .NET Framework 4.8 Runtime (https://dotnet.microsoft.com/en-us/download/dotnet-framework/net48)
• Mono.Cecil library (nuget Install-Package Mono.Cecil)

Run the tool via command line:

SimpleDotNetObfuscator.exe <input_file1> [<input_file2>] ...

Example:

SimpleDotNetObfuscator.exe MyApp.dll MyApp.exe MySource.cs

• Obfuscated .cs files are saved as .obf.cs
• Obfuscated assemblies (.dll and .exe) are renamed with .obf.dll and .obf.exe

• What does this tool do? This tool obfuscates .cs source files, .dll libraries, and .exe executables to make them harder to reverse-engineer.

• How does string encryption work? String literals in C# files are replaced with encrypted versions using Base64 encoding. At runtime, they are dynamically decrypted.

• Will obfuscation break my application? It depends. Renaming public types and members might cause issues in applications relying on reflection or serialization. Testing is highly recommended.

• How does the anti-debugging feature work? The tool checks if a debugger is attached or if profiling is enabled. If debugging is detected, the application exits to prevent reverse engineering.

• Can I obfuscate multiple files at once? Yes. You can pass multiple file paths as arguments when running the tool.

• Does this tool provide code virtualization? No.

• How do I install dependencies? Install the required Mono.Cecil package via NuGet using: Install-Package Mono.Cecil

• Is this tool safe to use? Yes, but always test your obfuscated binaries before deployment to avoid runtime errors.

Unit tests are written using MSTest. To run the tests:

dotnet test

This project is licensed under the GPL-3.0. See the LICENSE file for details.

For questions or feedback, please use issues section.