Cobalt Strike's ExternalC2 framework
A specification/framework for extending default C2 communication channels in Cobalt Strike
A specification/framework for extending default C2 communication channels in Cobalt Strike
Checked October 2026.
ExternalC2 is a specification/framework introduced by Cobalt Strike, which allows hackers to extend the default HTTP(S)/DNS/SMB C2 communication channels offered. Essentially this works by allowing the user to develop a number of components: Third-Party Controller - Responsible for creating a connection to the Cobalt Strike TeamServer, and communicating with a Third-Party Client on the target host using a custom C2 channel.
Third-Party Client - Responsible for communicating with the Third-Party Controller using a custom C2 channel, and relaying commands to the SMB Beacon. SMB Beacon - The standard beacon which will be executed on the victim host.
Using the diagram from CS’s documentation, we can see just how this all fits together.
No core features are listed for this product yet, so check the vendor's documentation for the full feature list.
No integrations are listed for this product yet. Check the vendor's documentation, or ask the vendor which integrations and APIs it supports.
Common questions about Cobalt Strike's ExternalC2 framework: features, pricing and alternatives.
Cobalt Strike's ExternalC2 framework is a product in the Red-Team & Adversary Emulation category. It covers C2.
Cobalt Strike's ExternalC2 framework is free. Download and setup instructions are at https://blog.xpnsec.com/exploring-cobalt-strikes-externalc2-framework/.
Alternatives to Cobalt Strike's ExternalC2 framework listed on CybersecTools:
Compare all Cobalt Strike's ExternalC2 framework alternatives at https://cybersectools.com/alternatives/cobalt-strikes-externalc2-framework
Cobalt Strike's ExternalC2 framework is available as on-premises software. It is listed for enterprises. It is free.
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