Cobalt Strike's ExternalC2 framework vs Ethiack: Side-by-Side Comparison (2026)

Cobalt Strike's ExternalC2 framework

Red team operators and penetration testers who need to test defenses against custom C2 channels will use ExternalC2 to bypass network detection by routing Cobalt Strike traffic through external redirectors and custom protocols. The framework is free and lets you replace Cobalt Strike's default HTTP/HTTPS beaconing entirely, which means your C2 can blend into legitimate traffic patterns your client's sensors won't flag. Skip this if your team runs assessments using only default Cobalt Strike profiles or lacks the network infrastructure to host and manage external redirectors; the setup friction and operational complexity only pay off when you're specifically validating detection gaps around custom C2 communications.

Ethiack

Mid-market and enterprise security teams that need continuous pentesting without hiring full-time red teams should start with Ethiack's autonomous agents, which run event-driven tests after code pushes and infrastructure changes rather than waiting for annual assessments. The platform covers external attack surface, internal networks, and mobile with grey-box testing that catches real exploitation paths, and its NIST ID.AM and ID.RA functions mean you'll actually know what you own and what's actually exploitable rather than drowning in scanner findings. Skip this if your team lacks the ops maturity to act on real-time vulnerability alerts or if you need deep compliance reporting templates out of the box.