alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Lumma Stealer Related Domain (iserjpcektoq .shop in TLS SNI)"; flow:established,to_server; tls.sni; bsize:17; content:"iserjpcektoq.shop"; fast_pattern; reference:md5,9d97b2a1cfddc367460f691a01dad20e; classtype:domain-c2; sid:2055703; rev:3; metadata:tls_state TLSEncrypt, created_at 2024_09_03, deployment Perimeter, deprecation_reason Age, malware_family Lumma_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_03_07, reviewed_at 2025_03_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)