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

SID: 2067808Rev: 11 views
Sourceet/open
CreatedFebruary 18, 2026
UpdatedFebruary 18, 2026
Classificationdomain-c2
alert tls $HOME_NET any -> any any (msg:"ET MALWARE Observed Win32/Lumma Stealer Related Domain (greekcs .cyou) in TLS SNI"; flow:established,to_server; tls.sni; bsize:12; content:"greekcs.cyou"; fast_pattern; nocase; reference:md5,582231461f751dcf959e358bd81426d5; classtype:domain-c2; sid:2067808; rev:1; metadata:tls_state TLSEncrypt, created_at 2026_02_18, deployment Perimeter, malware_family Lumma_Stealer, confidence High, signature_severity Critical, updated_at 2026_02_18, 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
582231461f751dcf959e358bd81426d5
Google SearchBrave Search

Metadata

tls stateTLSEncrypt
created at2026_02_18
deploymentPerimeter
malware familyLumma_Stealer
confidenceHigh
signature severityCritical
updated at2026_02_18
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol

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