alert tcp $HOME_NET any -> any any (msg:"ET DELETED Pitbull IRCbotnet Response"; flow:established; content:"PRIVMSG|20|"; content:"|3A|"; within:32; content:"4"; within:5; content:"12"; within:5; content:"|3a|"; within:5; pcre:"/\x3a.4\x7c.12.\x3a.4/"; reference:url,en.wikipedia.org/wiki/IRC_bot; classtype:trojan-activity; sid:2007624; rev:5; metadata:created_at 2010_07_30, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)