MalwareHealthcareHealthcareRansomwareData EncryptedPHIIdentity (basic)LowContained

Deer Oaks Behavioral Health

bd_1b13f60bfa0b74f2 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 1, 2023

Filed

Oct 31, 2023

To disclose

9 weeks

Affected

315state residents only

Linked

4 filings

Confidence

64%

Full breach record for Deer Oaks Behavioral Health →2 incidents on file

Deer Oaks Behavioral Health notified Montana patients of a September 1, 2023 ransomware incident involving unauthorized access to computer systems containing PHI. The incident was contained by Sophos antivirus. Forensic investigation confirmed unauthorized access. Patients were offered 12-24 months of identity theft protection via IDX.

J jump to incidentP pin to compareR raw source

Incident timeline

discovery → filing · 9 weeks / 60 days

Sep 1, 2023

Discovered

Oct 31, 2023

Filed

vs. sector median

4 wks faster

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_83aa209230579bbb2023-10-31Verified
Maine State AGbd_d934d79eb772ef042023-10-31Verified
New Hampshire State AGbd_daa31c59b03310ca2023-11-06 · +6dVerified

Name: Deer Oaks Behavioral Health
norm: deer oaks behavioral health

Name: Deer Oaks Behavioral Health
norm: deer oaks behavioral health
Industry: Healthcarellm

Discovered: Sep 1, 2023
Materiality determined: —
Notification sent: Sep 29, 2023
Affected individuals: 315state-resident count only
Data types: PHIIdentity (basic)
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1119 Automated Collection
Threat actor: ExternalFinancial

During the incident: Engaged a specialized cyber forensics team to investigate the root cause
Conducted a review of the data maintained within the impacted server
Offering identity theft protection services through IDX, A ZeroFox Company
Changes made: Offering identity theft protection services through IDX, A ZeroFox Company
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGOct 31 · first

Maine State AGOct 31 · first

Montana State AGOct 31 · first · this page

New Hampshire State AG+6d

Pattern: first filing Oct 31 (IN), last Nov 6 (NH) — a 6-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/OCP/Consumer-notification-letter-810.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 31, 2023
Raw hash: 1dd728de5a4e300b9f73a72edc07925137a2acd45b6e0117f05f28599c87fe8a

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityDeer Oaks Behavioral Health

Victim entityDeer Oaks Behavioral Health

Incidentdiscovered Sep 1, 2023

Stated responseEngaged a specialized cyber forensics team to investigate the root cause

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov