alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Email API Domain (resend .dev in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".resend.dev"; endswith; fast_pattern; classtype:misc-activity; sid:2068054; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2026_03_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2026_03_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)