alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PurpleFox EK Landing Page Domain in SNI"; flow:to_server,established; tls.sni; content:"lingering-math-ec29.7axrg.workers.dev"; endswith; classtype:exploit-kit; sid:2032889; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_04_29, deployment Perimeter, malware_family PurpleFox, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_29;)