alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed URL Shortener Service Domain (vroops .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:10; content:"vroops.com"; fast_pattern; classtype:misc-activity; sid:2064264; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_09_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag URL_Shortener, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_03, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)