alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Backdoor.Esion CnC Checkin"; flow:established,to_server; http.uri; content:"/bot/gate.php"; fast_pattern; reference:url,us.norton.com/security_response/writeup.jsp?docid=2011-052510-1535-99&tabid=2; classtype:command-and-control; sid:2013211; rev:4; metadata:created_at 2011_07_06, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)