HackingHealthcareHealthcareStolen CredentialsData ExfiltratedIdentity (basic)Government IDPHIHealth (basic)MediumContained

MCLAREN HEALTH CARE CORPORATION

bd_ed0fb31e367c9323 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 22, 2023

Filed

Nov 9, 2023

To disclose

11 weeks

Affected

Not disclosed

Linked

10 filings

Confidence

66%

Full breach record for MCLAREN HEALTH CARE CORPORATION →4 incidents on file

McLaren Health Care reported unauthorized network access between July 28 and August 23, 2023. The incident involved the exfiltration of PHI and PII, including SSNs, DOBs, and medical records. The company engaged forensic specialists and is offering credit monitoring services.

J jump to incidentP pin to compareR raw source

Vermont clock✗ VT AG >45 bday11 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

1 wks faster

This filing is one of 10 about the same incident.View merged incident

A leak claim by alphv about this victim predates this filing by 40 days.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

Regulatory filings (7) · sorted by filing gap

California State AGbd_8d2f2b3098afeb792023-11-09Verified by operator
Montana State AGbd_bd9b0633195a292f2023-11-09Verified by operator
Maine State AGbd_c24689bd6cff46e02023-11-09Verified
Massachusetts State AGbd_ddb258a8d643b7952023-11-09Verified by operator

Show 3 more filings ↓up to 20d gap

New Hampshire State AGbd_e2978f252f8567182023-11-09Verified by operator
Idaho State AGbd_e37f582cfe47b0242023-11-09Verified by operator
HHS OCRbd_18c5455f0815045b2023-10-20 · +20dVerified

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: Not disclosed
Data types: Identity (basic)Government IDPHIHealth (basic)
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: VT AG >45 bdayLeak >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 · 8 filings · 8 states

View merged incident ↗

HHS OCROct 20 · first

California State AG+20d

Montana State AG+20d

Maine State AG+20d

Massachusetts State AG+20d

New Hampshire State AG+20d

Idaho State AG+20d

Vermont State AG+20d · this page

Pattern: first filing Oct 20 (MI), last Nov 9 (VT) — a 20-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://ago.vermont.gov/document/2023-11-09-mclaren-health-care-data-breach-notice-consumers
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: 444a4cbc87cd5878332a1ddeeab3893d4b6ad5b34f048929b214e03a4854e0ce

Linked disclosures

Ransomware claims (2)

Regulatory filings (7) · 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

ComplianceVT AG >45 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov