Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Win32/Lumma Stealer Related Domain (accsrf .top in TLS SNI)"; flow:established,to_server; tls.sni; bsize:10; content:"accsrf.top"; fast_pattern; reference:url,www.proofpoint.com/us/blog/threat-insight/threat-actors-deliver-malware-youtube-video-game-cracks; classtype:domain-c2; sid:2063381; rev:3; metadata:tls_state TLSEncrypt, created_at 2025_07_10, deployment Perimeter, malware_family Lumma_Stealer, confidence High, signature_severity Critical, updated_at 2025_08_08, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)