alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Lumma Stealer Domain (get-verified .b-cdn .net in TLS SNI)"; flow:established,to_server; tls.sni; bsize:22; content:"get-verified.b-cdn.net"; fast_pattern; reference:url,x.com/Unit42_Intel/status/1829178013423992948; reference:url,github.com/PaloAltoNetworks/Unit42-timely-threat-intel/blob/main/2024-08-28-IOCs-for-Lumman-Stealer-from-fake-human-captcha-copy-paste-script.txt; classtype:domain-c2; sid:2055620; rev:1; metadata:tls_state TLSEncrypt, created_at 2024_08_29, deployment Perimeter, malware_family Lumma_Stealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_08_29, reviewed_at 2025_04_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)