Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Observed DeviceCode Phishing Domain (support-ms365 .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".support-ms365.com"; endswith; fast_pattern; classtype:social-engineering; sid:2069013; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_04_27, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_04_27;)