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Oyster is a cybercriminal malware operation associated with financially motivated activity. It has been linked to broader ransomware and malware ecosystems through infrastructure and enabling services used by other criminal actors. High-confidence reporting ties Oyster to activity that benefited from fraudulent code-signing services supplied by Fox Tempest, which helped malicious software appear legitimate and improved defense evasion. Based on the available information, Oyster should be understood as part of the criminal malware landscape connected to ransomware-adjacent operations, but the supplied facts do not establish detailed attribution, victimology, geographic focus, or a fuller alias set for the actor with sufficient confidence.
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1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
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