MalwareHealthcareHealthcareRansomwareData EncryptedSupply Chain (3P Vendor)Customer Data InvolvedPHIHealth (basic)Identity (basic)LowContained

Pomona Valley Hospital Medical Center

bd_b4a7ed8551649528 · schema v1 · pii pii-v1

Severity

Low

Discovered

Nov 1, 2023

Filed

Mar 22, 2024

To disclose

20 weeks

Affected

3state residents only

Linked

3 filings

Confidence

65%

Full breach record for Pomona Valley Hospital Medical Center →

Pomona Valley Hospital Medical Center notified patients of a ransomware incident involving a vendor's subcontractor in late November 2023. Patient PHI was encrypted. The incident did not affect Pomona's network. Investigation is complete.

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Incident timeline

discovery → filing · 20 weeks / 142 days

Nov 1, 2023

Begins

Nov 1, 2023

Discovered

Mar 22, 2024

Filed

vs. sector median

+8 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

California State AGbd_e239572e227ca8ea2024-03-22Verified
HHS OCRbd_f77d0fe48b631e8c2024-03-20 · +2dCandidate

Name: Pomona Valley Hospital Medical Center
norm: pomona valley hospital medical center
Domain: pvhmc.org

Name: Pomona Valley Hospital Medical Center
norm: pomona valley hospital medical center
Domain: pvhmc.org
Industry: Healthcarellm

Discovered: Nov 1, 2023
Breach occurred: Nov 1, 2023 – Nov 30, 2023
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 3state-resident count only
Data types: PHIHealth (basic)Identity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1195 Supply Chain Compromise
Threat actor: ExternalFinancial
Initial access: supply_chain

During the incident: Worked with our vendor to investigate
Engaged a third-party expert to investigate and respond to the incident
Stopped using that vendor (and their subcontractor) to store our patients’ data
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 20 weeks(142 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 2 states

View merged incident ↗

HHS OCRMar 20 · first

California State AG+2d

Montana State AG+2d · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/Consumer-notification-letter-1214.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Mar 22, 2024
Raw hash: f451d7fd5485ea1505b3c32da89d982bbcf70683919d3a4c71aaeaf328525df4

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityPomona Valley Hospital Medical Center

Victim entityPomona Valley Hospital Medical Center

Incidentdiscovered Nov 1, 2023

Stated responseWorked with our vendor to investigate

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov