alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Panther Stealer Domain (api-lofy .xyz in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".api-lofy.xyz"; endswith; fast_pattern; reference:url,github.com/PantherOwO/Panther-Stealer; classtype:trojan-activity; sid:2054946; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_08_06, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_06, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)