alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Simbot.Backdoor Checkin"; flow:established,to_server; http.uri; content:"/rclgx.php?id="; startswith; reference:md5,a4edc9d31bc0ad763b3424e9306f4d7c; classtype:command-and-control; sid:2014719; rev:4; metadata:created_at 2012_05_08, signature_severity Major, updated_at 2024_04_14;)