ET MALWARE Win32/Lumma Stealer Related CnC Domain in DNS Lookup (castous .cyou)

SID: 2066490Rev: 10 views
Sourceet/open
CreatedDecember 28, 2025
UpdatedDecember 28, 2025
Classificationdomain-c2
alert dns $HOME_NET any -> any any (msg:"ET MALWARE Win32/Lumma Stealer Related CnC Domain in DNS Lookup (castous .cyou)"; dns.query; bsize:12; content:"castous.cyou"; fast_pattern; nocase; reference:md5,99a7d9f6a6b04d87ab32da215ed9eccb; classtype:domain-c2; sid:2066490; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_12_28, deployment Perimeter, deployment Internal, malware_family Lumma_Stealer, confidence High, signature_severity Major, updated_at 2025_12_28, 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
99a7d9f6a6b04d87ab32da215ed9eccb
Google SearchBrave Search

Metadata

attack targetClient_Endpoint
created at2025_12_28
deploymentInternal
malware familyLumma_Stealer
confidenceHigh
signature severityMajor
updated at2025_12_28
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol

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