alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OSX/WireLurker checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/mac/update.zip"; reference:url,www.paloaltonetworks.com/content/dam/paloaltonetworks-com/en_US/assets/pdf/reports/Unit_42/unit42-wirelurker.pdf; classtype:command-and-control; sid:2019665; rev:3; metadata:created_at 2014_11_07, malware_family OSX_WireLurker, signature_severity Major, updated_at 2020_05_13;)