Bro IDS is a powerful open source network security monitoring framework which I have had the opportunity to experiment with on a network monitoring server. It can log metadata for well known protocols such as HTTP, DNS and SMTP, as well as extract files it sees being transferred in these protocols. It logs all its results to CSV files and provides a useful tool called ‘bro-cut’ to enable analysts to search through these results. Bro-cut is a great tool but I wanted to store my data in MongoDB to enable useful queries to be run regularly and also so a Graphical User Interface (GUI) could be built on top of it. I also wanted full packet capture to be stored so I could trace any suspicious files or events back to the network activity that created it.
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