Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Commonly Actor Abused Domain (image .thum .io in TLS SNI)"; flow:established,to_server; tls.sni; bsize:13; content:"image.thum.io"; fast_pattern; classtype:misc-activity; sid:2055845; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_09_13, deployment Perimeter, confidence High, signature_severity Informational, tag TA_Abused_Service, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_13;)