HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedIdentity (basic)Government IDPHIHealth (basic)Financial accountMediumContained

MCLAREN HEALTH CARE CORPORATION

bd_bd9b0633195a292f · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 22, 2023

Filed

Nov 9, 2023

To disclose

11 weeks

Affected

137state residents only

Linked

11 records

Confidence

65%

Full breach record for MCLAREN HEALTH CARE CORPORATION →3 incidents on file

McLaren Health Care notified Montana residents of a cybersecurity event where unauthorized access occurred between July 28 and August 23, 2023. The breach exposed PHI, SSNs, DOBs, and financial info. Notification sent November 9, 2023. Forensic specialists engaged; credit monitoring offered.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d11 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 25 days

discovery → filing · 11 weeks / 79 days

Jul 28, 2023

Begins

Aug 22, 2023

Discovered

Nov 9, 2023

Filed

vs. sector median

+2 wks slower

This filing is one of 11 records about the same incident.View merged incident

A leak claim by alphv about this victim was first seen 41 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Sitealphvbd_6326acdfc9de458a2023-10-04 · +35dVerified by operator
Leak Sitealphvbd_c4b2c0198b70501e2023-09-29 · +40dVerified by operator

Regulatory filings (8) · sorted by filing gap

California State AGbd_8d2f2b3098afeb792023-11-09Verified by operator
Maine State AGbd_c24689bd6cff46e02023-11-09Verified
Massachusetts State AGbd_ddb258a8d643b7952023-11-09Verified by operator
New Hampshire State AGbd_e2978f252f8567182023-11-09Verified by operator

Show 4 more filings ↓up to 312d gap

Idaho State AGbd_e37f582cfe47b0242023-11-09Verified by operator
Vermont State AGbd_ed0fb31e367c93232023-11-09Verified by operator
HHS OCRbd_18c5455f0815045b2023-10-20 · +20dVerified
Illinois State AGbd_7374d2c287e33ed62023-01-01 · +312dVerified by operator

Name: MCLAREN HEALTH CARE CORPORATION
norm: mclaren health care
Domain: mclaren.org

Name: MCLAREN HEALTH CARE CORPORATION
norm: mclaren health care
Domain: mclaren.org
Industry: Healthcarellm

Discovered: Aug 22, 2023
Breach occurred: Jul 28, 2023 – Aug 23, 2023
Undetected for: 25 daysoccurrence → discovery
Materiality determined: —
Notification sent: Nov 9, 2023
Affected individuals: 137state-resident count only
Data types: Identity (basic)Government IDPHIHealth (basic)Financial account
Data elements: Social Security numberDate of birthMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Initial access: valid_credentials

During the incident: Launched an investigation with the assistance of third-party forensic specialists
Secure our network
Undertook a thorough review of the potentially impacted files
Offering identity theft protection services through IDX
Changes made: Working to review our existing policies and procedures
Implement additional administrative and technical safeguards
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(79 days from discovery to filing)
Compliance flags: Leak >30d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 9 filings · 9 states

View merged incident ↗

Illinois State AGJan 1 · first

HHS OCR+292d

California State AG+312d

Maine State AG+312d

Massachusetts State AG+312d

New Hampshire State AG+312d

Idaho State AG+312d

Vermont State AG+312d

Montana State AG+312d · this page

Pattern: first filing Jan 1 (IL), last Nov 9 (MT) — a 312-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-833.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 9, 2023
Raw hash: c277fbc57bde117da4a6b6ad1ee2c8a1ac2dbac31c728e3c0fbfb704a206e9ce

Linked disclosures

Ransomware claims (2)

Regulatory filings (8) · sorted by filing gap

Reporting entityMCLAREN HEALTH CARE CORPORATION

Victim entityMCLAREN HEALTH CARE CORPORATION

Incidentdiscovered Aug 22, 2023

Stated responseLaunched an investigation with the assistance of third-party forensic specialists

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancedojmt.gov