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

First seen 2 Dec 2025, 18:33 UTC • Feeds.Feedburner

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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.

How this analysis works

Attack Flow

7 entities, 12 inferred relationships (STIX 2.1).

Technique (2)

Data Breach
Ransomware

Organization (1)

Under Armour

Threat Actor (3)

Everest
Everest Ransomware Gang
Everest Ransomware Group

Tool (1)

Tox Messenger

Relationships

Everest uses Tox Messenger
Everest Ransomware Gang uses Tox Messenger
Everest Ransomware Group uses Tox Messenger
Everest uses Data Breach
Everest uses Ransomware
Everest Ransomware Gang uses Data Breach
Everest Ransomware Gang uses Ransomware
Everest Ransomware Group uses Data Breach
Everest Ransomware Group uses Ransomware
Everest targets Under Armour
Everest Ransomware Gang targets Under Armour
Everest Ransomware Group targets Under Armour

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

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Extracted Entities

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