C3 is a framework developed by WithSecureLabs that enables security professionals to create custom command and control (C2) channels for offensive security operations. The framework provides a foundation for rapid prototyping of C2 communication mechanisms, allowing users to develop tailored command and control infrastructure based on specific operational requirements. C3 integrates with existing offensive security toolkits, enabling security teams to incorporate custom C2 channels into their current testing workflows and methodologies. The framework supports the development of various communication protocols and channels, providing flexibility in how command and control operations are conducted during security assessments and penetration testing activities.