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Fourth is a threat actor name associated with claims of longstanding unauthorized access related to Ubisoft-focused intrusions. The actor has been observed publicly denying the novelty of another group's access and asserting that it had maintained access for an extended period, while positioning itself in alignment with a separate actor involved in disruptive activity against Rainbow Six Siege infrastructure. Available reporting does not provide high-confidence evidence of Fourth's specific tooling, intrusion methods, victimology beyond this Ubisoft-related context, or independently verified operational outcomes. The actor's known profile is therefore limited to public claims and apparent alignment within a multi-actor dispute surrounding compromises affecting Ubisoft systems.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
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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Domains, IPs, and hashes tied to this actor, refreshed continuously.