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.
FEATURES
ALTERNATIVES
Romana automates cloud native network creation and secures applications with a distributed firewall.
Tcpdump is a command-line packet analyzer for capturing and analyzing network traffic.
Fail2ban is a daemon that scans log files and bans IPs showing malicious signs to protect servers from brute-force attacks.
A utility to generate malicious network traffic for security evaluation.
Snort 3 is the next generation Snort IPS with enhanced features and improved cross-platform support.
Object scanning system with scalable and flexible architecture for intrusion detection.
PINNED

Mandos Brief Newsletter
A weekly newsletter providing cybersecurity leadership insights, industry updates, and strategic guidance for security professionals advancing to management positions.

PTJunior
An AI-powered penetration testing platform that autonomously discovers, exploits, and documents vulnerabilities while generating NIST-compliant reports.

CTIChef.com Detection Feeds
A tiered cyber threat intelligence service providing detection rules from public repositories with varying levels of analysis, processing, and guidance for security teams.

OSINTLeak
OSINTLeak is a tool for discovering and analyzing leaked sensitive information across various online sources to identify potential security risks.

ImmuniWeb® Discovery
ImmuniWeb Discovery is an attack surface management platform that continuously monitors an organization's external digital assets for security vulnerabilities, misconfigurations, and threats across domains, applications, cloud resources, and the dark web.

Checkmarx SCA
A software composition analysis tool that identifies vulnerabilities, malicious code, and license risks in open source dependencies throughout the software development lifecycle.

Orca Security
A cloud-native application protection platform that provides agentless security monitoring, vulnerability management, and compliance capabilities across multi-cloud environments.

DryRun
A GitHub application that performs automated security code reviews by analyzing contextual security aspects of code changes during pull requests.