alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Expiro Domain (knjghuig .biz in TLS SNI)"; flow:established,to_server; tls.sni; bsize:12; content:"knjghuig.biz"; fast_pattern; reference:url,twitter.com/tosscoinwitcher/status/1768337500211446074; classtype:trojan-activity; sid:2051657; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_03_14, deployment Perimeter, malware_family Expiro, confidence High, signature_severity Major, updated_at 2024_08_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)