Data verified May 2026
ADYour product here. Reach security decision-makers.Launch a campaignExternalC2 Description
A library for integrating communication channels with the Cobalt Strike External C2 server. This library provides an implementation of the Cobalt Strike External C2 spec, including a basic web channel and a websocket channel. The codebase is designed to allow additional channels to be added easily. Features Implemented: C2 Channels - Direct Socket Connection, Web API Channel (Dotnet Core), WebSockets Channel (Dotnet Core). The code is heavily commented, and it is recommended to read the comments first. Getting started: The solution should be built with Visual Studio 2017. More info will be added soon. Developing, Building, Deploying, Contributing sections are to be updated. License: ExternalC2 is open-sourced software licensed under the MIT license.
ExternalC2 FAQ
Common questions about ExternalC2 including features, pricing, alternatives, and user reviews.
ExternalC2 is A library for integrating communication channels with the Cobalt Strike External C2 server. It is a Security Operations solution designed to help security teams with Red Team.
ExternalC2 is a free Security Operations tool. This makes it accessible for organizations of all sizes, from startups to enterprises. Visit https://github.com/ryhanson/ExternalC2/ for download and installation instructions.
Popular alternatives to ExternalC2 include:
1.Fortra Cobalt Strike - Threat emulation tool for adversary simulations and red team operations (Commercial)
2.FourCore ATTACK - FourCore ATTACK is an adversary emulation platform to manage cyber risk with evidence (Commercial)
3.Core Security Cobalt Strike - Post-exploitation threat emulation platform for red team operations. (Commercial)
4.Core Security Outflank Security Tooling - Red team toolkit for EDR evasion, initial access, and post-exploitation. (Commercial)
5.Core Security Bundles and Suites - Bundled offensive security suites combining pen testing, red teaming, and VM. (Commercial)
Compare all ExternalC2 alternatives at https://cybersectools.com/alternatives/externalc2
ExternalC2 is for security teams and organizations that need Red Team. It's particularly suitable for small to medium-sized teams looking for cost-effective solutions. Other Security Operations tools can be found at https://cybersectools.com/categories/security-operations
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