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Everest Ransomware Group Breaches Under Armour, Exposing 343 GB of Data

Everest Ransomware Group Breaches Under Armour, Exposing 343 GB of Data

First seen 2 Dec 2025, 18:33 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

The Everest ransomware group has claimed responsibility for a significant data breach at Under Armour, allegedly stealing 343 GB of sensitive information. This data includes customer details, purchase history, and internal company files, which have been displayed on the group's dark web leak site. The breach reportedly affects millions of users and stems from Under Armour's marketing or product systems.

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