HackingHealthcareHealthcareStolen CredentialsData ExfiltratedTargetedIdentity (basic)PIILowContained

Dameron Hospital

bd_78bee24c50a0bf15 · schema v1 · pii pii-v1

Severity

Low

Discovered

Mar 21, 2025

Filed

Apr 2, 2025

To disclose

12 days

Affected

54state residents only

Linked

7 filings

Confidence

64%

Full breach record for Dameron Hospital →3 incidents on file

Dameron Hospital notified Montana DOJ of a security incident occurring Nov 4-5, 2023. Unauthorized access/acquisition of personal info (names) was determined on March 21, 2025, following forensic investigation. No PHI evidence found. Credit monitoring offered.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 503 days

discovery → filing · 12 days

Nov 4, 2023

Begins

Mar 21, 2025

Discovered

Apr 2, 2025

Filed

vs. sector median

11 wks faster

This filing is one of 7 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

HHS OCRbd_36c97bfb1e2491ba2025-04-02Verified by operator
California State AGbd_59ac0f3e061256722025-04-02Verified
Indiana State AGbd_c59278804a53d6142025-04-02Verified
Vermont State AGbd_db0571f01a4096d22025-04-02Verified

Show 2 more filings ↓up to 1d gap

Massachusetts State AGbd_e35f6f18fda15ad82025-04-02Verified
Illinois State AGbd_64809bc52fb8829c2025-04-01 · +1dCandidate

Name: Dameron Hospital
norm: dameron hospital
Domain: dameronhospital.org

Name: Dameron Hospital
norm: dameron hospital
Domain: dameronhospital.org
Industry: Healthcarellm

Discovered: Mar 21, 2025
Breach occurred: Nov 4, 2023 – Nov 5, 2023
Undetected for: 503 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 54state-resident count only
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Commenced a prompt and thorough investigation
Working very closely with external cybersecurity professionals
Extensive forensic investigation and comprehensive document review
Offering a complimentary membership of Experian IdentityWorks Credit 3B
Changes made: Evaluates and modifies its practices and internal controls to enhance the security and privacy of your information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 12 days(12 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 6 states

View merged incident ↗

Illinois State AGApr 1 · first

HHS OCR+1d

California State AG+1d

Indiana State AG+1d

Vermont State AG+1d

Massachusetts State AG+1d

Montana State AG+1d · 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/2025/08/Consumer-notification-letter-53.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 2, 2025
Raw hash: be7944f19b0b9fec68e140faf9ee7684d931af0c5768a789c94e3b066c48044e

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityDameron Hospital

Victim entityDameron Hospital

Incidentdiscovered Mar 21, 2025

Stated responseCommenced a prompt and thorough investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov