Alert Data
Alert data consists of messages generated by intrusion prevention systems (IPSs) or intrusion detection systems (IDSs) in response to traffic that violates a rule or matches the signature of a known exploit. A network IDS (NIDS), such as Snort, comes configured with rules for known exploits. Alerts are generated by Snort and are made readable and searchable by the Sguil and Squert applications, which are part of the Security Onion suite of NSM tools.
Session and Transaction Data
Zeek, formerly Bro, is a network security monitoring tool
Full Packet Captures
Wireshark