Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed File Sharing Service Domain (app .box .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".app.box.com"; endswith; fast_pattern; threshold:type limit,count 1,seconds 300,track by_src; classtype:misc-activity; sid:2065192; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_14, deployment Perimeter, confidence High, signature_severity Informational, tag TA_Abused_Online_Service, tag File_Sharing, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_14;)