alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Etherhiding Domain (metrics-onclick .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:19; content:"metrics-onclick.com"; fast_pattern; classtype:trojan-activity; sid:2071907; rev:1; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2026_09_02, deployment Perimeter, malware_family Etherhiding, performance_impact Low, confidence High, signature_severity Major, updated_at 2026_09_02, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)