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

7.0.35.0SID: 2070095Rev: 1Enabled4 views
Sourceet/open
Fileemerging-malware.rules
CreatedJune 27, 2026
UpdatedJune 27, 2026
Classificationdomain-c2
alert tls $HOME_NET any -> any any (msg:"ET MALWARE Observed Win32/Lumma Stealer Related Domain (overcjo .cyou) in TLS SNI"; flow:established,to_server; tls.sni; bsize:12; content:"overcjo.cyou"; fast_pattern; nocase; reference:md5,a3d0ecbe7974d02048cb3e6080b11e56; classtype:domain-c2; sid:2070095; rev:1; metadata:tls_state TLSEncrypt, created_at 2026_06_27, deployment Perimeter, malware_family Lumma_Stealer, confidence High, signature_severity Critical, updated_at 2026_06_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
a3d0ecbe7974d02048cb3e6080b11e56
Google SearchBrave Search

Metadata

tls stateTLSEncrypt
created at2026_06_27
deploymentPerimeter
malware familyLumma_Stealer
confidenceHigh
signature severityCritical
updated at2026_06_27
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol

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