Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Commonly Actor Abused Online Service Domain (usrfiles .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".usrfiles.com"; endswith; fast_pattern; reference:md5,d1528b4fd48104873a60abd4c5477d8d; classtype:misc-activity; sid:2054540; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_07_17, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_17;)