alert tcp any any -> $HOME_NET any (msg:"ET DELETED Pitbull IRCbotnet Commands"; flow:from_server,established; content:"PRIVMSG|20|"; pcre:"/PRIVMSG.*@(portscan|nmap|back|udpflood|tcpflood|httpflood|linuxhelp|rfi|system|milw0rm|logcleaner|sendmail|join|part|help)/i"; reference:url,en.wikipedia.org/wiki/IRC_bot; classtype:trojan-activity; sid:2007625; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_20;)