Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Anonymous Domain Registrar Domain (* .njalla .net in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".njalla.net"; endswith; fast_pattern; reference:url,njal.la/about/; classtype:misc-activity; sid:2064492; rev:1; metadata:attack_target Client_and_Server, created_at 2025_09_08, deployment Perimeter, performance_impact Low, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1665, mitre_technique_name Hide_Infrastructure;)