alert tcp any any -> any 6666:7000 (msg:"ET CHAT IRC USER command"; flow:to_server,established; content:"USER|20|"; nocase; content:"|203a|"; within:40; content:"|0a|"; within:40; flowbits:set,is_proto_irc; classtype:misc-activity; sid:2002023; rev:16; metadata:created_at 2010_07_30, signature_severity Informational, updated_at 2019_07_26;)