ET MALWARE Lumma Stealer Domain in DNS Lookup (genuscr .cyou)
Sourceet/open
Fileemerging-malware.rules
CreatedAugust 21, 2026
UpdatedAugust 21, 2026
Classificationtrojan-activity
alert dns $HOME_NET any -> any any (msg:"ET MALWARE Lumma Stealer Domain in DNS Lookup (genuscr .cyou)"; dns.query; bsize:12; content:"genuscr.cyou"; nocase; classtype:trojan-activity; sid:2071730; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2026_08_21, deployment Perimeter, malware_family LummaStealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_08_21;)
Metadata
affected productWindows_XP_Vista_7_8_10_Server_32_64_Bit
attack targetClient_Endpoint
created at2026_08_21
deploymentPerimeter
malware familyLummaStealer
performance impactLow
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2026_08_21
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