alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING SUSPICIOUS IRC - NICK and -PC"; flow:established,to_server; content:"NICK "; depth:5; pcre:"/^[^\r\n]*-PC/Ri"; classtype:bad-unknown; sid:2017323; rev:4; metadata:created_at 2013_08_13, confidence Medium, signature_severity Informational, updated_at 2019_07_26;)