County of Rock, WI
Disclosed Nov 29, 20232 years ago10,853 affectedConfirmed
The covered entity (CE), County of Rock, WI, reported that it experienced a ransomware attack affecting the protected health information (PHI) of 10,853 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and social security numbers, diagnoses, conditions, lab results, medications, and claims and financial information. The CE notified HHS, the affected individuals, and the media. In response to the breach, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards.
What is known
| People affected | 10,853 (as reported to HHS) |
|---|---|
| Disclosed | Nov 29, 2023 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Government · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| Vermont Attorney General: 2023-12-01 County of Rock, WI Data Breach Notice to Consumersago.vermont.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): County of Rock, WI (Healthcare Provider, WI)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Nov 29, 2023 | 10,853 |
| Vermont AGresidents of VT | Dec 1, 2023 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 10853 · backfill source
- 2026-09-25 · disclosed: 2023-12-01 to 2023-11-29 · backfill source
- 2026-09-25 · summary: empty to The covered entity (CE), County of Rock, WI, reported that it experienced a ransomware attack affecting the protected health information (PHI) of 10,853 individuals. The PHI involved included names, addresses, dates of birth, drivers’ licen · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (Vermont AG), confirmed by Vermont AG. Record counts are as reported. Not legal advice.