HackingHealthcareHealthcareStolen CredentialsTargetedCustomer Data InvolvedPIIIdentity (basic)LowContained

Rocky Mountain Oncology Care

bd_f0e2c6deff7eafce · schema v1 · pii pii-v1

Severity

Low

Discovered

Apr 11, 2025

Filed

Oct 29, 2025

To disclose

29 weeks

Affected

10state residents only

Linked

2 filings

Confidence

64%

Full breach record for Rocky Mountain Oncology Care →3 incidents on file

Rocky Mountain Oncology Care notified Montana residents of unauthorized system access between March 31 and April 10, 2025. The incident, detected on April 11, 2025, compromised patient names. Law enforcement was notified, and security protocols are being enhanced.

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Incident timeline

undetected · 11 days

discovery → filing · 29 weeks / 201 days

Mar 31, 2025

Begins

Apr 11, 2025

Discovered

Oct 29, 2025

Filed

vs. sector median

+18 wks slower

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

HHS OCRbd_2a426d96a4f281542025-10-24 · +5dVerified

Name: Rocky Mountain Oncology Care
norm: rocky mountain oncology care

Name: Rocky Mountain Oncology Care
norm: rocky mountain oncology care
Industry: Healthcarellm

Discovered: Apr 11, 2025
Breach occurred: Mar 31, 2025 – Apr 10, 2025
Undetected for: 11 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 10state-resident count only
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Regulator citations: law enforcement was notified
Initial access: valid_credentials

During the incident: Measures were taken immediately in response
A thorough investigation was conducted
Law enforcement was notified
Changes made: Existing security protocols are being enhanced
Additional security measures are being implemented
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 29 weeks(201 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

HHS OCROct 24 · first

Montana State AG+5d · this page

Pattern: first filing Oct 24 (WY), last Oct 29 (MT) — a 5-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/2025/11/Consumer-notification-letter-1.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 29, 2025
Raw hash: 39d2e8e1cc429046f171d01abf6529e03c36c3c5e4a78bd7d42ed3f277ee209f

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityRocky Mountain Oncology Care

Victim entityRocky Mountain Oncology Care

Incidentdiscovered Apr 11, 2025

Stated responseMeasures were taken immediately in response

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov