alert dns $HOME_NET any -> any any (msg:"ET INFO QR Generator Domain in DNS Lookup (qr .pro)"; dns.query; dotprefix; content:".qr.pro"; nocase; endswith; reference:url,qr-generator.ai; classtype:misc-activity; sid:2066638; 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;)