alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed URL Shortener Domain (lnkz .at) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".lnkz.at"; endswith; fast_pattern; classtype:misc-activity; sid:2052118; rev:1; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2024_04_16, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag URL_Shortener, updated_at 2024_04_16;)