University of Mississippi Medical Center hit by Medusa ransomware, 1TB of patient data stolen
The Medusa ransomware gang claimed responsibility for an attack on the University of Mississippi Medical Center (UMMC), posting the organization to its dark web leak site on March 12, 2026.
Key points
- Medusa ransomware gang responsible
- Claimed 1TB of patient health information and employee records stolen
- Ransom demand of $800,000
Connected intelligence
Signal brief
Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.
- Published
- Mar 12, 2026
- Updated
- Jun 26, 2026
- Confidence
- Medium
- Evidence
- 2 sources
Structured assessment
Signal analysis
This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
Watch ransomware, endpoint compromise and business interruption exposure.
- Source type: possible insider or internal misuse
Business impact
- Impact area
- Confidentiality, Availability
- Likely asset
- User or customer data
Mentioned entities
Quick context
Questions about this signal
What happened in this signal?
The Medusa ransomware gang claimed responsibility for an attack on the University of Mississippi Medical Center (UMMC), posting the organization to its dark web leak site on March 12, 2026. The attack, which began on February 19, forced the closure of 35 clinics, suspended elective surgeries, and disrupted access to the Epic EHR system. Medusa claimed to have stolen over 1TB of patient health information and employee records and demanded an $800,000 ransom.
When was this signal reported?
Shadow Tier lists Mar 12, 2026 as the signal date.
Which organization is connected to this signal?
Ummc is the organization connected to this public signal.
Explore UmmcWhich attack pattern is relevant?
This signal is connected to current ransomware incidents based on its reported incident context.
Explore current ransomware incidentsWhich impact area is relevant?
This signal is connected to data exposure and breach intelligence based on its reported consequences.
Explore data exposure and breach intelligenceRelated signals
Compare shared topics, actors and incident patterns before opening the full signal.
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Sponsored by Hudson Rock – Use Hudson Rock's free cybercrime intelligence tools to learn how Infostealer infections are leading to ransomware attacks This page displays the 100 most recent victim disclosures attributed to ransomware groups, as detected by Ransomware.live . Our platform continuously monitors and scrapes ransomware group leak sites to identify and list newly published victims. Recent Breaches › dystar.com Listed by settra Ransomware Group dystar.com Listed by settra Ransomware Group: What Was Exposed & What To Do Occurred June 2026 · publicly disclosed June 28, 2026. Dystar.com was listed by the Settra ransomware group on June 28, 2026, with internal files reported exfiltrated in the attack. An undisclosed number of people may be affected; check the listing and monitor your accounts for signs of compromise. The incident was reported on 28 June 2026. dystar.com appears on a listing attributed to the settra ransomware group. The group claims to hold 1.3 terabytes of data described as the complete digital archive of DyStar. No independent confirmation of the volume, the date of access, or the method of entry has been released. The number of people affected remains undisclosed. Settra is a ransomware operator that lists victim organisations on a public site after encrypting systems and copying files. The group’s listings function as a claim that data has been taken and may be released if demands are not met. No additional statements from settra specific to dystar.com have been verified beyond the listing itself. dystar.com belongs to an organisation that operates in the specialty chemicals sector, supplying dyes and related products to industrial clients. Entities of this type routinely maintain records on production processes, customer accounts, supplier arrangements and internal communications. A breach that exposes such material can affect both commercial operations and any personal details contained in those records. The only category named in available reports is internal files exfiltrated during a ransomware attack. The precise contents of the 1.3 terabytes referenced in the listing have not been itemised by the organisation or independently verified. Organisations in this sector commonly store employee records, contractual documents and operational data, yet the exact composition of the material in this case stays unconfirmed. Internal files can contain identifying information, financial references or communications that retain value long after the initial incident. Individuals named in those files may encounter follow-on risks such as targeted fraud or unwanted contact. For the organisation, the exposure of proprietary material can complicate business relationships and regulatory compliance even if the number of personal records remains unknown. Begin by monitoring accounts linked to any email address you have used with dystar.com or its partners. Enable multi-factor authentication on those accounts and review recent login activity. Request a copy of any personal data the organisation holds about you under applicable data-protection rules. Readers can run a free exposure scan of their email address against known breach data to check for appearances in public listings. Change passwords for any accounts that may share credentials with dystar.com systems. Watch bank and credit statements for unusual activity over the next several months. Contact dystar.com directly to ask what categories of personal information were held and whether they have been notified of the listing. Read GalaxyWarden’s full analysis of the dystar.com Listed by settra Ransomware Group → Publicly posted by settra — unverified claim, pending independent verification Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated a
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