alert tls $HOME_NET any -> any any (msg:"ET MALWARE Observed Win32/Lumma Stealer Related Domain (insiqf) in TLS SNI"; flow:established,to_server; tls.sni; bsize:6; content:"insiqf"; fast_pattern; nocase; reference:md5,1b539df4c8ea639391ce8965613049be; classtype:domain-c2; sid:2062581; rev:1; metadata:tls_state TLSEncrypt, created_at 2025_05_27, deployment Perimeter, malware_family Lumma_Stealer, confidence High, signature_severity Critical, updated_at 2025_05_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)