alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed QR Generator Domain (qr-code .io in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".qr-code.io"; endswith; fast_pattern; reference:url,qr-generator.ai; classtype:misc-activity; sid:2066651; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_01_09, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_09, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1036, mitre_technique_name Masquerading;)