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. 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.
Signal context
First seen: Mar 12, 2026
Last updated: Jun 26, 2026
Status: Public signal
Key points
- Medusa ransomware gang responsible
- Claimed 1TB of patient health information and employee records stolen
- Ransom demand of $800,000
Signal analysis
BetaThis 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.
Sector: Health Care and Social Assistance
Likely country: Location not provided
The feed marks multiple actor roles. Treat this as a review signal rather than a final attribution.
- Source type: outside the affected organization
- Source type: possible insider or internal misuse
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 6 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
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