A lightweight C# obfuscation tool for .Net applications.
(It was created this 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
.csfiles are saved as.obf.cs - Obfuscated assemblies (
.dlland.exe) are renamed with.obf.dlland.obf.exe
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What does this tool do? This tool obfuscates
.cssource files,.dlllibraries, and.exeexecutables 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.
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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.
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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.
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Can I obfuscate multiple files at once? Yes. You can pass multiple file paths as arguments when running the tool.
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Does this tool provide code virtualization? No.
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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 testThis project is licensed under the GPL-3.0. See the LICENSE file for details.
For questions or feedback, please use issues section.