Bro - Network Security Monitor

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Bro is a powerful network analysis framework that is much different from the typical intrusion detection system you may know. Bro provides a comprehensive platform for more general network traffic analysis as well.

Bro is a passive, open-source network traffic analyzer. It is primarily a security monitor that inspects all traffic on a link in depth for signs of suspicious activity. More generally, however, Bro supports a wide range of traffic analysis tasks even outside of the security domain, including performance measurements and helping with trouble-shooting.

Bro comes with built-in functionality for a range of analysis and detection tasks, including extracting files from HTTP sessions, detecting malware by interfacing to external registries, reporting vulnerable versions of software seen on the network, identifying popular web applications, detecting SSH brute-forcing, validating SSL certificate chains, and much more.

http://www.bro.org
https://github.com/bro/bro

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