Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed File Sharing Domain (drive .protonmail .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"drive.protonmail.com"; bsize:20; fast_pattern; classtype:bad-unknown; sid:2036352; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_04_25, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_25;)