ET MALWARE Possible APT29 CozyBear/SeaDaddy SSL/TLS Certificate Observed
Sourceet/open
CreatedOctober 24, 2018
UpdatedJuly 24, 2025
Classificationtargeted-activity
alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible APT29 CozyBear/SeaDaddy SSL/TLS Certificate Observed"; flow:established,to_client; tls.cert_subject; content:"C=--, ST=SomeState, L=SomeCity, O=SomeOrganization, OU=SomeOrganizationalUnit, CN=Cnyunwei.CNC"; content:"root@Cnyunwei.CNC"; fast_pattern; tls.cert_serial; content:"46:76"; classtype:targeted-activity; sid:2026538; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_24, deployment Perimeter, confidence High, signature_severity Major, tag CozyBear, tag SeaDaddy, tag APT29, updated_at 2025_07_24;)
Metadata
affected productWindows_XP_Vista_7_8_10_Server_32_64_Bit
attack targetClient_Endpoint
created at2018_10_24
deploymentPerimeter
confidenceHigh
signature severityMajor
tagAPT29
updated at2025_07_24
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