alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED B0tN3t IRCbotnet"; flow:from_server,established; content:"|3a|"; offset:0; depth:1; content:"B0tN3t"; within:32; nocase; flowbits:set,irc.start; flowbits:set,is_proto_irc; reference:url,en.wikipedia.org/wiki/Botnet; classtype:misc-activity; sid:2007672; rev:7; metadata:created_at 2010_07_30, signature_severity Unknown, updated_at 2019_07_26;)