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

Short answer

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. Operational technology teams defending industrial control systems with Modbus deployments should pick SMOD for its modular design, which lets you add offensive capabilities only to the protocols and network segments that matter to your environment instead of licensing a bloated framework. The 93 GitHub stars and active maintenance signal a tool maintained by practitioners who understand Modbus specifics rather than generic ICS vendors. Skip this if you need a polished GUI or vendor support contracts; SMOD is command-line only and lives on GitHub.