InvisibilityCloak is a proof-of-concept obfuscation toolkit designed for C# post-exploitation tools. The toolkit provides various features to obfuscate C# code, making it difficult for security tools and analysts to identify and analyze malicious code during security assessments. The tool is specifically designed for red teaming and penetration testing scenarios, enabling security professionals to simulate real-world attacks and test organizational defenses. InvisibilityCloak is distributed as an open-source project available on GitHub, allowing the cybersecurity community to contribute to its development and improvement.