alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Observed TA450 Domain in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".microsoftonlines.com"; endswith; fast_pattern; classtype:trojan-activity; sid:2061586; rev:2; metadata:attack_target Client_Endpoint, created_at 2025_03_25, deployment Perimeter, former_category MALWARE, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag TA450, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_16, former_sid 2860885;)