alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Delf Checkin via HTTP (up)"; flow:established,to_server; content:"/up.html?"; nocase; http_uri; content:"set="; nocase; http_uri; content:"&pid="; nocase; http_uri; content:"&MAC="; http_uri; nocase; classtype:command-and-control; sid:2007939; rev:5; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2019_07_26;)