alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed QR Code Generator Domain (qrfy .io in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".qrfy.io"; endswith; fast_pattern; reference:url,qrfy.io/; classtype:misc-activity; sid:2053696; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_06_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_06_14, reviewed_at 2024_10_14;)