Disclosure context

About Medusa

Medusa, also known as MedusaLocker, is a financially motivated ransomware group that emerged in November 2022 and has since compromised 568 known victims across multiple countries. The group's origin and specific affiliations remain unclear from publicly available intelligence, though their operational patterns suggest they function as an independent ransomware operation rather than a documented Ransomware-as-a-Service model. Medusa primarily targets organizations in the United States, United Kingdom, Canada, Italy, and Australia, with a focus on business services, healthcare, manufacturing, and technology sectors, employing typical ransomware tactics including data encryption and likely exfiltration for double extortion purposes, though specific technical methodologies and initial access vectors have not been extensively documented in public threat intelligence reports. While the group has maintained a relatively high victim count since its emergence, detailed information about specific notable campaigns, high-profile victims, or major ransom demands has not been widely reported by major cybersecurity firms or law enforcement agencies. As of current intelligence assessments, Medusa appears to remain active in the threat landscape, continuing to target organizations across their established geographic and sectoral preferences. The group has been linked to 568 public disclosures across our corpus. First observed on a leak site on November 15, 2022; most recent post February 14, 2026. The operation is currently active.

Also tracked as: MedusaLocker.

Timeline of this disclosure

November 9, 2025Atrium Living Centers listed by Medusaon the group's public leak site

Records: 2.000 Employees

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Atrium Living Centers is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

Atrium Living Centers

Claimed by Medusa · listed 6 months ago

2.000 Employees

Records

Age

since listed · data leaked

Status timeline

Listed
Nov 9, 2025
Data leaked

At a glance

Group: Medusa
Status: Data leaked
Country: United States
Sector: Healthcare
Listed on leak site: Nov 9, 2025
Records: 2.000 Employees

About the victim

AI dossier — public-source company profile

Atrium Living Centers is a US-based healthcare organization operating long-term care and assisted living facilities. The company provides residential and nursing care services to elderly and vulnerable adult populations. No public site content was available to confirm specific locations or scale.

Industry: Long-Term Care & Assisted Living
Employees: 201-500

Attack summary

Severity: critical — Atrium Living Centers operates in long-term/elder care, meaning any exfiltrated data almost certainly contains regulated PHI (HIPAA-protected), PII of vulnerable adults, and potentially financial records at scale. The disclosed status is data_published, indicating data has been released rather than merely threatened.

The Medusa ransomware group has listed Atrium Living Centers with a disclosed status of data_published, indicating claimed exfiltration and/or publication of data; however, the leak post content was not accessible due to a CAPTCHA wall, so specific claims about encryption or data types cannot be confirmed from this source.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Patient health records (likely)
Personally identifiable information (PII)
Medical/clinical data
Employee records
Financial records

What the group claims

Atrium Living Centers is a 100% employee-owned company providing skilled nursing, rehabilitation, and long-term care services. The organization is dedicated to delivering compassionate, high-quality healthcare to residents while promoting dignity, respect, and community involvement. With a strong focus on personalized treatment, Atrium Living Centers offers both short-term post-acute rehabilitation and long-term nursing care. Their mission is to “be a light in the lives of our residents and families,” ensuring comfort and well-being in a supportive environment. The company operates multiple care centers across several U.S. states, including Ohio, Michigan, Kentucky, and Wisconsin. company is headquartered in Atrium Living Centers headquarters is located at 2550 Corporate Exchange Drive, Suite 200, Columbus, Ohio 43231, United States. 2,000 Employees

The leak post

captured from the group's site

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Sources

Leak posthttp://xfv4jzckytb4g3ckwemcny3ihv4i5p4lqzdpi624cxisu35my5fwi5qd.onion/detail?id=67741bb987a8e3e4ab91543894e76f86

Source

Indexed 6 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.