alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Atomic MacOS Stealer Domain (maybe .host in TLS SNI)"; flow:established,to_server; tls.sni; bsize:10; content:"maybe.host"; fast_pattern; reference:url,twitter.com/x3ph1/status/1703492680951509154; classtype:trojan-activity; sid:2048102; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_09_18, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_17, reviewed_at 2023_11_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)