Versions (3)
Version DetailsCurrent
Rev: 1 • Sep 25, 2023, 12:00 PMET INFO Observed URL Shortening Service Domain (appurl .io in TLS SNI)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed URL Shortening Service Domain (appurl .io in TLS SNI)"; flow:established,to_server; tls.sni; bsize:9; content:"appurl.io"; fast_pattern; classtype:bad-unknown; sid:2048228; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_09_25, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_25, reviewed_at 2024_04_29;)
Sep 25, 2023, 12:00 PM
Sep 25, 2023, 12:00 PM
Sep 25, 2023, 10:00 PM
Aug 18, 2025, 8:35 PM
rules/emerging-info.rules