Heywood Hospital Data Breach
Status: Confirmed
Breach Intelligence Summary
Entity: Heywood Hospital · Actor: Sinobi · Source: DataBreach.com / ObscureIQ intelligence
Attack: Ransomware via Network intrusion / ransomware deployment
Timeline: Breach (Nov, 2025) · Reported (Dec, 2025) · Leak (12/28/25)
Exposure: 93K+ records · Social Security Number, Email, Phone Number, Name
Status: Confirmed · Risk: High (Identity theft + Phishing / SIM swap)
Summary
Executive Summary In October 2025 Heywood Hospital (serving North Central Massachusetts) declared a “Code Black” following a severe cyberattack that forced them to divert ambulances and take critical systems offline. While the hospital initially described it broadly as a “cybersecurity incident the Sinobi ransomware gang later claimed responsibility boasting the theft of 550GB of data. DataBreach.com Parse Results Our team has analyzed the leaked files and identified the following unique identifiers, confirming the severity of the identity theft risk:
Social Security Numbers: , 92 700 (Unique) Phone Numbers: , 55 800 (Unique) Email Addresses: , 25 100, (Unique)
The Attack: On October 12 2025 Heywood and Athol Hospitals suffered a network outage that disrupted radiology lab services and email. The Extortion: By November 2025 the Sinobi group listed Heywood on their leak site threatening to publish 550GB of data if a ransom was not paid. The Exposure: The high count of SSNs (nearly 4x the number of emails) suggests this dataset includes not just digital portal users but potentially legacy patient records and maybe hospital staff/employment files that predate modern digital registration.
About Heywood Hospital
Heywood Hospital is the organization affected by this breach. User data may have been generated through account creation, service usage, or business operations.
If you have interacted with Heywood Hospital in any capacity, your data may be included in this breach.
Threat Actor: Sinobi
This breach has been attributed to Sinobi. The group is known for data theft campaigns targeting organizations through various intrusion methods.
- Network intrusion / ransomware deployment
Breach Exploitation Status
High
Status
Detected
Possible
Detected
Possible
Unknown
Indefinite (critical identifiers)
SSNs and government IDs never expire. This data can be used for identity theft years or decades after exposure.
Data Points Exposed
Dark Web Verification
Status: Confirmed
- Dataset containing approximately 93K+ records has been identified in breach intelligence sources.
- The data is indexed and searchable across breach notification platforms.
Impact
This breach carries high risk due to the nature of exposed data fields and the scale of affected records.
- Targeted phishing referencing Heywood Hospital accounts or services
- Identity theft using exposed Social Security Numbers
- SIM-swap attempts where phone numbers are present
- Data broker enrichment and resale
Recommendations for Impacted Individuals
If you believe your information may be included:
Non-clients may request a breach impact review.
Heywood Hospital account updates
Password reset requests
Verify directly through official channels.
Email compromise is often the first pivot point.
Frequently Asked Questions
In Nov, 2025, Heywood Hospital experienced a data breach that resulted in the exposure of approximately 93K+ records containing personal information.
The exposed data includes Social Security Number, Email, Phone Number, Name.
Approximately 93K+ records were affected based on current breach intelligence.
Yes. This breach is treated as confirmed based on data observed in breach intelligence platforms.
Data circulation has been detected across breach-sharing channels. Downstream exploitation risk exists based on the nature of the exposed fields.
Rotate passwords associated with Heywood Hospital, enable multi-factor authentication on email and financial accounts, and monitor for suspicious activity.
Protect Yourself
Check If You’re Affected
Enter your email to check if your data appears in this breach.
Get Free Breach Alerts
Be the first to know when new breaches are disclosed. Free forever.
High-Risk? Get an Exposure Audit
Executives, public figures, and high-net-worth individuals face elevated risk. Our team provides full-spectrum exposure audits and threat monitoring.
Corporate Accountability
Organizations that collect personal data have a duty to implement reasonable safeguards and to notify affected individuals when breaches occur.
Scope assessments may evolve as investigations continue. Users should not rely solely on early estimates when making risk decisions.
ObscureIQ Advisory
We combine proprietary dark web access with commercial and restricted breach intelligence to verify exposure and assess real-world risk.
- A public-facing individual
- A high-profile executive
- A customer of Heywood Hospital
- Or simply concerned about credential reuse
We can confirm whether your information is circulating and evaluate downstream threat vectors.