OSF Healthcare Data Breach
Status: Confirmed
Breach Intelligence Summary
Entity: OSF Healthcare · Actor: Cl0p · Source: DataBreach.com / ObscureIQ intelligence
Attack: Ransomware via Network intrusion / ransomware deployment
Timeline: Breach (May, 2023) · Reported (Dec, 2024) · Leak (Dec, 2024)
Exposure: 520K+ records · Social Security Number, Email, Phone Number, Name, Home Address, Medical Diagnosis
Status: Confirmed · Risk: High (Identity theft + Medical identity fraud)
Summary
The OSF Healthcare data breach attributed to the Cl0p ransomware group’s exploitation of Progress Software’s MOVEit Transfer platform exposed a significant amount of sensitive data managed through Welltok’s systems. The breach compromised over 500 000 records including personal and medical information such as full names Social Security numbers home addresses phone numbers email addresses dates of birth insurance provider details marital status and doctor names.
About OSF Healthcare
OSF Healthcare 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 OSF Healthcare in any capacity, your data may be included in this breach.
Threat Actor: Cl0p
This breach has been attributed to Cl0p. 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 520K+ 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 OSF Healthcare accounts or services
- Identity theft using exposed Social Security Numbers
- Medical identity fraud and insurance scams
- SIM-swap attempts where phone numbers are present
- Physical mail scams and address-based identity verification fraud
- 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.
OSF Healthcare account updates
Medical billing or insurance notices
Password reset requests
Verify directly through official channels.
Email compromise is often the first pivot point.
Frequently Asked Questions
In May, 2023, OSF Healthcare experienced a data breach that resulted in the exposure of approximately 520K+ records containing personal information.
The exposed data includes Social Security Number, Email, Phone Number, Name, Home Address, Medical Diagnosis.
Approximately 520K+ 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 OSF Healthcare, enable multi-factor authentication on email and financial accounts, and monitor for suspicious activity.
Protect Yourself
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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 OSF Healthcare
- Or simply concerned about credential reuse
We can confirm whether your information is circulating and evaluate downstream threat vectors.