alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible iKittens OSX MacDownloader CNC Beacon"; flow:established,to_server; urilen:14; http.method; content:"GET"; http.uri; content:"/Servermac.php"; depth:14; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:url,iranthreats.github.io/resources/macdownloader-macos-malware/; classtype:command-and-control; sid:2023876; rev:3; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, created_at 2017_02_07, deployment Perimeter, malware_family MacDownloader, confidence Medium, signature_severity Major, tag c2, updated_at 2020_08_04, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)