alert tls $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE MageCart CnC Domain in SNI"; flow:to_server,established; tls.sni; content:"cdn-content.cc"; endswith; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/new-magecart-attack-delivered-through-compromised-advertising-supply-chain/; classtype:command-and-control; sid:2026821; rev:3; metadata:attack_target Client_Endpoint, created_at 2019_01_16, deployment Perimeter, malware_family MageCart, performance_impact Low, confidence High, signature_severity Major, tag SSL_TLS_SNI, updated_at 2020_09_16;)