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

First seen 23 Nov 2025, 04:45 UTC • Feeds.Feedburner

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The Everest ransomware group has claimed responsibility for a significant data breach involving Under Armour, reportedly stealing 343 GB of sensitive internal data. The exposed data includes customer information, purchase history, and product details, potentially affecting millions of users worldwide. The group has displayed sample data on their dark web leak site and issued a seven-day ultimatum.

How this analysis works

Attack Flow

13 entities, 30 inferred relationships (STIX 2.1).

Technique (5)

Data Breach
DDoS
Malware
Ransomware
T1566 - Phishing

Organization (4)

Air Miles España
Iberia
Petrobras
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 DDoS
Everest uses Malware
Everest uses Ransomware
Everest uses T1566 - Phishing
Everest Ransomware Gang uses Data Breach
Everest Ransomware Gang uses DDoS
Everest Ransomware Gang uses Malware
Everest Ransomware Gang uses Ransomware
Everest Ransomware Gang uses T1566 - Phishing
Everest Ransomware Group uses Data Breach
Everest Ransomware Group uses DDoS
Everest Ransomware Group uses Malware
Everest Ransomware Group uses Ransomware
Everest Ransomware Group uses T1566 - Phishing
Everest targets Air Miles España
Everest targets Iberia
Everest targets Petrobras
Everest targets Under Armour
Everest Ransomware Gang targets Air Miles España
Everest Ransomware Gang targets Iberia
Everest Ransomware Gang targets Petrobras
Everest Ransomware Gang targets Under Armour
Everest Ransomware Group targets Air Miles España
Everest Ransomware Group targets Iberia
Everest Ransomware Group targets Petrobras
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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