CareSTL Health 2025 Data Breach
Healthcare / Community Health Center / Consumer
CareSTL Health 2025 Data Breach: Patient PHI Exposed via Cephalus Ransomware
St. Louis federally qualified community health center.
Confirmed · ObscureIQ Intelligence
Breach Risk Index i
94/100
Lower riskHigher risk
High and current: recent, valuable data circulating on the dark web now.
Data Sensitivity i
ElevatedExposed data raises the risk of fraud, targeting, and impersonation. Proactive steps are warranted.
10k rowsRecords
2025Year
The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.
Crucial data exposed
SSNSocial Security Number
PHI / MedicalMedical Diagnosis
Breach Summary
Around June 28, 2025 CareSTL Health was hit by a ransomware attack claimed by the Cephalus group on August 26, 2025, with the actor alleging more than 500 GB of stolen data including patient names, medical diagnoses and Social Security numbers.
Full threat analysis, exploitation vectors, and principal guidance below.
10 additional sections · verified field analysis · defensive doctrine
Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…
10k rows records analyzed
About CareSTL Health
CareSTL Health is a St. Louis, Missouri federally qualified health center providing primary and community healthcare to underserved populations.
Why They Hold Your Data
A community health center holds patient identity and contact data, dates of birth, Social Security numbers, health insurance and, in clinical records, diagnoses, test results and treatment history (PHI).
Recent Developments
The Cephalus ransomware group claimed CareSTL Health in late August 2025, alleging over 500 GB of data.
Data Points Exposed
3 verified field types
Full Name
Medical Diagnosis Critical
Social Security Number Critical
Breach Impact
As a HIPAA-covered community health center, the breach carries OCR notification, class litigation and patient-trust damage; the Cephalus extortion added public-leak pressure.
Principal Risk Advisory
What this means for a principal
A healthcare-linked breach: exposure ties a named individual to a provider relationship and, where clinical or insurance data is present, to conditions and treatment. For a high-profile principal this is targeting-grade, not merely identity-theft-grade: the combination lets an adversary locate, impersonate, or pressure the principal with little additional work.
What You Should Do
- Freeze credit at all three bureaus and monitor for new-account and tax-refund fraud.
- Watch for medical-benefit fraud and health-themed phishing that references real provider relationships.
- Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.
How ObscureIQ Can Help
- Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
- Exposure mapping: cross-reference the exposed identifiers against broker-available data to size and prioritize the principal's wider footprint.
- ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).
C
Threat Actor: CephalusConfidence: High
Motivation: Financial extortion
A ransomware group first seen mid-June 2025 that breaches organizations through stolen RDP credentials on accounts lacking MFA; targets law firms, healthcare, financial services and IT across the US and Japan.
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