Metasploit Framework: the broadest module library
Metasploit remains the default choice when the job is selecting and running a known exploit or auxiliary module. Its module ecosystem and documentation are unmatched, and most operators already know the workflow.
It is not primarily designed as a stealth C2, and its interface heritage is human-terminal oriented, which makes it a harder fit for AI-assisted tasking without a lot of custom scripting around it.
Follow Erebus updates
Track Zypheron C2 direction as it moves toward release.
Erebus is being designed for AI-readable tasking, explicit operator review, and cleaner evidence continuity into Zypheron assessments.
Sliver: the established open-source option
Sliver gave operators a credible, actively maintained open-source C2 with modern team-server workflows. It is a strong default when the buying criterion is pure C2 capability available today, for free, with an active community.
Reporting and evidence handling are left to the operator; Sliver itself does not carry activity into a client deliverable.
Havoc: modern usability, still community-driven
Havoc represents the current generation of open-source C2 design: cleaner UX than older frameworks, active development, and a modular payload system. It is a good pick for operators who want current tooling without a commercial license.
Cobalt Strike: the mature paid standard
Cobalt Strike is still the commercial benchmark most blue teams build detections against, which cuts both ways: it is mature and well-documented, but its signatures are also the most heavily studied by defenders. The license cost is real, and it is squarely built for human operators, not AI-assisted tasking.
Brute Ratel: built with EDR evasion as the explicit goal
Brute Ratel positioned itself specifically around evading EDR and detection tooling, which made it popular with red teams testing mature blue teams. Licensing is commercial and vetted, similar to Cobalt Strike, and it carries the same human-operator-first design assumptions.
Erebus: the AI-native entrant to watch
Erebus is Zypheron's coming-soon C2, built from the ground up for structured, AI-readable tasking and explicit operator review gates, with the goal of feeding activity directly into Zypheron findings and reports instead of leaving it in a separate console.
It is not trying to win a module-count contest against Metasploit or a stealth contest against Brute Ratel. The bet is that the next real gap in C2 design is the handoff between AI-assisted operation and evidence, not raw capability.
- Choose Metasploit or Sliver/Havoc for proven, immediately available capability.
- Choose Cobalt Strike or Brute Ratel when detection evasion against a mature blue team is the top requirement and budget allows.
- Watch Erebus if AI-assisted tasking and clean evidence continuity into a pentest report matter more than an established module library.