Was UNDER ARMOUR hit by ransomware?

UNDER ARMOUR was listed by the Everest ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Everest ransomware group?

Everest is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the UNDER ARMOUR breach?

Everest published data attributed to UNDER ARMOUR. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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UNDER ARMOUR

Claimed by Everest · listed 8 months ago

Age

since listed · data leaked

Status timeline

ListedNov 17, 2025
Data leakeddate unknown

At a glance

Group: Everest
Status: Data leaked
Country: United States
Sector: Consumer Services
Listed on leak site: Nov 17, 2025

About the victim

AI dossier — public-source company profile

Under Armour is a major American sportswear and athletic apparel company headquartered in Baltimore, Maryland. The company designs, manufactures, and markets performance apparel, footwear, and accessories for athletes and fitness enthusiasts worldwide. It operates globally across retail, wholesale, and direct-to-consumer channels.

Industry: Athletic Apparel & Footwear
Address: 1020 Hull Street, Baltimore, MD 21230, United States
Employees: 10000+
Founded: 1996

Attack summary

Severity: medium — Status is marked as data_published suggesting exfiltration occurred, but the leak post is extremely sparse with no detail on data type, volume, or sensitivity, and no proof files are described. Under Armour is a large consumer brand with known prior breach history, but without confirmed regulated data exposure the severity cannot be elevated to high or critical.

The Everest ransomware group has listed Under Armour as a victim with a disclosed status of data_published, claiming to have exfiltrated or published data. The leak post itself is minimal and provides no specific detail on the nature or volume of data involved.

medium

Data the group says was taken

AI dossier — extracted from the leak post

Undisclosed company data

Original description

AI-summarised, not from the leak post

Under Armour, Inc. is an American multinational corporation founded in 1996 by Kevin Plank. The company specializes in manufacturing and selling branded performance apparel, footwear, and accessories. Its products are engineered with innovative technologies to mitigate the impact of environmental conditions on physical activities. Headquartered in Baltimore, Maryland, it caters extensively to the sports industry globally.

The leak post

captured from the group's site

© 2026, All rights reserved
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Sources

Leak posthttp://ransomocmou6mnbquqz44ewosbkjk3o5qjsl3orawojexfook2j7esad.onion/news/UNDER_ARMOUR/

Source

Indexed 8 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About Everest

Everest is a financially-motivated ransomware group that emerged in September 2021, operating with a focus on profit-driven extortion campaigns against organizations primarily in the United States and Europe. The group's country of origin and specific affiliations remain undocumented in public threat intelligence reporting, though their operational patterns suggest they likely operate as an independent entity rather than a formal ransomware-as-a-service model. Limited public documentation exists regarding Everest's specific attack methodologies, initial access vectors, or technical capabilities, though their victim profile indicates they employ standard ransomware tactics targeting a diverse range of sectors including healthcare, technology, business services, and manufacturing organizations. Since their emergence, Everest has claimed responsibility for attacks against 339 victims across multiple countries, with the United States, United Kingdom, Italy, Germany, and Spain representing their primary geographic targets, though no specific high-profile incidents or major ransoms have been publicly documented by law enforcement or major security firms. As of current reporting, Everest appears to remain an active threat actor, though the limited public intelligence available suggests they operate as a lower-tier ransomware group compared to more prominent and well-documented criminal organizations. The group has been linked to 369 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post May 29, 2026. The operation is currently active.

Timeline of this disclosure

November 17, 2025UNDER ARMOUR listed by Evereston the group's public leak site

Other recent disclosures by Everest

Everest has been linked to 369 public victims on Darkfield. A sample of the most recent:

See the full Everest dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consumer Services sector, which has 829 disclosures indexed across all operators we track. Geographically, UNDER ARMOUR is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Everest means UNDER ARMOUR appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on Everest's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.