alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed FingerprintJS Domain (fpjscdn .net in TLS SNI)"; flow:established,to_server; tls.sni; bsize:11; content:"fpjscdn.net"; fast_pattern; classtype:misc-activity; sid:2070111; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2026_06_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2026_06_30, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1082, mitre_technique_name System_Information_Discovery;)