alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sefnit Checkin 5"; flow:established,to_server; content:"?subid="; http_uri; content:"&u="; distance:0; http_uri; pcre:"/\?subid=\d{9}&u=[\w\.\-]{23}$/Ui"; classtype:command-and-control; sid:2014248; rev:2; metadata:created_at 2012_02_21, signature_severity Major, updated_at 2019_07_26;)