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Cobalt Strike's ExternalC2 framework is a free offensive security tool. WebDAV Covert Channel is a free offensive security tool. Compare features, ratings, integrations, and community reviews side by side to find the best offensive security fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
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.
Red team operators and penetration testers validating WebDAV weaknesses in their own infrastructure will find WebDAV Covert Channel valuable for demonstrating C2 evasion tactics that slip past signature-based detection. The tool's use of native WebDAV protocol features means it generates legitimate-looking traffic patterns that most organizations haven't specifically instrumented to catch, making it effective for stress-testing detection gaps in NIST Detect capabilities. Skip this if your goal is operational C2 for live engagements; it's a lab tool for controlled assessment, not a field weapon, and requires explicit network access to WebDAV services most enterprises have already disabled.
A specification/framework for extending default C2 communication channels in Cobalt Strike
A covert channel technique that uses WebDAV protocol features to deliver malicious payloads and establish C2 communication while bypassing security controls.
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Common questions about comparing Cobalt Strike's ExternalC2 framework vs WebDAV Covert Channel for your offensive security needs.
Cobalt Strike's ExternalC2 framework: A specification/framework for extending default C2 communication channels in Cobalt Strike..
WebDAV Covert Channel: A covert channel technique that uses WebDAV protocol features to deliver malicious payloads and establish C2 communication while bypassing security controls..
Both serve the Offensive Security market but differ in approach, feature depth, and target audience.
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