HackingHealthcareHealthcareData ExfiltratedCustomer Data InvolvedDelayed DiscoveryIdentity (basic)Government IDHealth (basic)PHIMediumContained

MCLAREN HEALTH CARE CORPORATION

bd_e2978f252f856718 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Aug 22, 2023

Filed

Nov 9, 2023

To disclose

11 weeks

Affected

115state residents only

Linked

11 records

Confidence

66%

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

McLaren Health Care notified New Hampshire residents on November 9, 2023, regarding a cybersecurity event. Unauthorized access to McLaren's network occurred between July 28 and August 23, 2023. The breach potentially exposed names, Social Security numbers, and protected health information (PHI) of approximately 115 New Hampshire residents. McLaren engaged third-party forensic specialists, notified federal law enforcement, and is providing 12-24 months of credit monitoring and identity theft protection services through IDX to affected individuals.

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
Montana State AGbd_bd9b0633195a292f2023-11-09Verified by operator
Maine State AGbd_c24689bd6cff46e02023-11-09Verified
Massachusetts State AGbd_ddb258a8d643b7952023-11-09Verified 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: 115state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: McLaren notified federal law enforcement regarding the event
Initial access: valid_credentials

During the incident: Launched an investigation with the assistance of third-party forensic specialists
Secured our network
Notified federal law enforcement
Providing access to credit monitoring services for through IDX
Providing impacted individuals with guidance on how to better protect against identity theft and fraud
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

Montana State AG+312d

Maine State AG+312d

Massachusetts State AG+312d

Idaho State AG+312d

Vermont State AG+312d

New Hampshire State AG+312d · this page

Pattern: first filing Jan 1 (IL), last Nov 9 (NH) — 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://mm.nh.gov/files/uploads/doj/remote-docs/mclaren-health-care-20231109.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: 58945bf13ab3e31b122747615cd02b254a4544698075c34e57b77d596d32c78b

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 provenancemm.nh.gov