Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Commonly Abused Link Agregating Service Domain (linkup .top in TLS SNI)"; flow:established,to_server; tls.sni; bsize:10; content:"linkup.top"; fast_pattern; classtype:misc-activity; sid:2052243; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_04_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_20;)