alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Mac Flashback Checkin 1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/owncheck/"; classtype:command-and-control; sid:2014597; rev:3; metadata:created_at 2012_04_17, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_21;)