Cobalt Strike's ExternalC2 framework vs XlsGen: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
Cobalt Strike's ExternalC2 framework is a free red-team & adversary emulation tool. XlsGen is a free red-team & adversary emulation tool. Compare features, ratings, integrations, and community reviews side by side to find the best red-team & adversary emulation fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
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.
Penetration testers and red teamers who need to generate weaponized Excel files without touching a Windows machine will move faster with XlsGen; it generates BIFF8 files with 4.0 macros in pure code, eliminating the dependency on Microsoft Office entirely. The 44 GitHub stars reflect steady adoption among practitioners who've already ditched Excel-dependent macro generation workflows. Skip this if your team relies on social engineering payloads that need Office Open XML fidelity or modern macro obfuscation; XlsGen prioritizes delivery speed over evasion depth.
