Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed URL Shortener Service Domain (zshorten .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".zshorten.com"; endswith; fast_pattern; reference:url,zshorten.com; classtype:misc-activity; sid:2038990; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_26, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_26;)