alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed MageCart Domain (mistlink .online in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".mistlink.online"; endswith; fast_pattern; reference:url,twitter.com/500mk500/status/1798429221838258244; classtype:trojan-activity; sid:2053263; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_06_05, deployment Perimeter, deprecation_reason Relevance, malware_family MageCart, confidence High, signature_severity Major, updated_at 2025_04_21, reviewed_at 2025_04_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)