ET MALWARE Observed Win32/Lumma Stealer Related Domain (sirrbef .cyou) in TLS SNI

SID: 2065935Rev: 10 views
Sourceet/open
CreatedNovember 27, 2025
UpdatedNovember 27, 2025
Classificationdomain-c2
alert tls $HOME_NET any -> any any (msg:"ET MALWARE Observed Win32/Lumma Stealer Related Domain (sirrbef .cyou) in TLS SNI"; flow:established,to_server; tls.sni; bsize:12; content:"sirrbef.cyou"; fast_pattern; nocase; reference:md5,78e66be1b164be42647148cad26bb10e; classtype:domain-c2; sid:2065935; rev:1; metadata:tls_state TLSEncrypt, created_at 2025_11_27, deployment Perimeter, malware_family Lumma_Stealer, confidence High, signature_severity Critical, updated_at 2025_11_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)

References

md5
78e66be1b164be42647148cad26bb10e
Google SearchBrave Search

Metadata

tls stateTLSEncrypt
created at2025_11_27
deploymentPerimeter
malware familyLumma_Stealer
confidenceHigh
signature severityCritical
updated at2025_11_27
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol

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