MalwareHealthcareHealthcareRansomwareData ExfiltratedRansom DemandedCustomer Data InvolvedDownstream VictimsIdentity (basic)Government IDHealth (basic)Financial accountMediumContained

MCLAREN HEALTH CARE CORPORATION

bd_277031208ce9f1ec · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 5, 2024

Filed

Jun 20, 2025

To disclose

46 weeks

Affected

15state residents only

Linked

8 filings

Confidence

65%

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

McLaren Health Care notified the NH AG of a ransomware attack. Unauthorized access occurred July 17–Aug 3, 2024. Discovered Aug 5, 2024. Affected 15 NH residents with PII, SSN, driver's license, and PHI. Notification sent June 20, 2025. Credit monitoring offered.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d46 weeks discovery → filing

Incident timeline

undetected · 19 days

discovery → filing · 46 weeks / 319 days

Jul 17, 2024

Begins

Aug 5, 2024

Discovered

May 5, 2025

Scope determined

Jun 20, 2025

Filed

vs. sector median

+33 wks slower

This filing is one of 8 about the same incident.View merged incident

A leak claim by alphv about this victim predates this filing by 629 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Vermont State AGbd_16315e097bb33c702025-06-20Verified
Indiana State AGbd_5ca789ddf9c80c462025-06-20Verified
Massachusetts State AGbd_e1f2148c0d56b32a2025-06-20Verified
Maine State AGbd_e56983ab307e30882025-06-20Verified

Show 3 more filings ↓up to 19d gap

HHS OCRbd_290c029e469208462025-06-24 · +4dVerified
Texas State AGbd_1484ed84002634352025-06-30 · +10dVerified
Illinois State AGbd_4885c58b706423f22025-06-01 · +19dCandidate

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 5, 2024
Breach occurred: Jul 17, 2024 – Aug 3, 2024
Undetected for: 19 daysoccurrence → discovery
Materiality determined: May 5, 2025
Notification sent: Jun 20, 2025
Affected individuals: 15state-resident count only
Data types: Identity (basic)Government IDHealth (basic)Financial account
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Notified Office of the New Hampshire Attorney GeneralProviding written notice to relevant state and federal regulators
Initial access: valid_credentials

During the incident: Activated their emergency response processes
Launched an investigation with the assistance of third-party forensic specialists to secure their network
Established a call center to answer questions from McLaren’s patients and their communities
Undertook an extensive forensic review of the potentially impacted files
Working to implement additional safeguards and training to its employees
Providing access to credit monitoring services for twelve (12) months, through IDX
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
Providing written notice of this incident to relevant state and federal regulators
Providing written notice... to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Changes made: Implement additional administrative and technical safeguards to further secure the information on our systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 46 weeks(319 days from discovery to filing)
Compliance flags: Leak >180d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 8 filings · 8 states

View merged incident ↗

Illinois State AGJun 1 · first

Vermont State AG+19d

Indiana State AG+19d

Massachusetts State AG+19d

Maine State AG+19d

New Hampshire State AG+19d · this page

HHS OCR+23d

Texas State AG+29d

Pattern: first filing Jun 1 (IL), last Jun 30 (TX) — a 29-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://mm.nh.gov/files/uploads/doj/remote-docs/mclaren-health-care-20250620.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 20, 2025
Raw hash: 0212101b22f473001947de0db626ec8921af9929c254875f3554c502fcd168c5

Linked disclosures

Regulatory filings (7) · sorted by filing gap

Reporting entityMCLAREN HEALTH CARE CORPORATION

Victim entityMCLAREN HEALTH CARE CORPORATION

Incidentdiscovered Aug 5, 2024

Stated responseActivated their emergency response processes

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov