alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY Observed SSL Cert (DNS Service)"; flow:from_server,established; tls.cert_subject; content:".sslip.io"; endswith; nocase; fast_pattern; classtype:policy-violation; sid:2033621; rev:1; metadata:created_at 2021_07_30, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_30;)