Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Dynamic DNS Domain (dedyn .io in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".dedyn.io"; endswith; fast_pattern; classtype:misc-activity; sid:2065031; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_01, deployment Perimeter, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_01;)