Heywood Healthcare Cyberattack Disrupts Hospitals, Exposes Patient Data
On October 12, 2025, Heywood Healthcare, encompassing Heywood Hospital and Athol Hospital, experienced a network outage due to a cyberattack. The incident disrupted critical services including radiology, lab services, and email, leading to a 'Code Black' and the diversion of ambulances. The Sinobi ransomware group later claimed responsibility for the attack, threatening to publish 550GB of stolen data. Potentially exposed information includes names, dates of birth, Social Security numbers, driver's license or state ID numbers, medical records, health insurance details, and contact information.
Signal context
First seen: Oct 12, 2025
Last updated: Jun 25, 2026
Status: Public signal
Key points
- Cyberattack affected Heywood Hospital, Athol Hospital, and Heywood Medical Group.
- Incident began on October 12, 2025, causing network outages and disruption of services.
- Sinobi ransomware group claimed responsibility and threatened to leak 550GB of data.
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: Finance and Insurance
Likely country: Location not provided
Watch ransomware, endpoint compromise and business interruption exposure.
- Source type: outside the affected organization
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 21 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
Heywood Hospital | Search the Data Breachhttps://databreach.com/breach/heywood_orgPublic source from databreach.com.
Heywood Medical Group Data Breach Investigation - Claim Depothttps://www.claimdepot.com/investigations/heywood-medical-group-data-breach-2025Public source from claimdepot.com.
Heywood Healthcare Data Breach | Emery Reddyhttps://www.emeryreddy.com/blog/data-breach/heywood-healthcare-data-breachPublic source from emeryreddy.com.
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