HackingHealthcareHealthcareVulnerability ExploitRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedEmployee Data InvolvedTargetedIdentity (basic)Government IDHealth (basic)Financial accountCriticalContained

MCLAREN HEALTH CARE CORPORATION

bd_e56983ab307e3088 · schema v1 · pii pii-v1

Severity

Critical

Discovered

Aug 5, 2024

Filed

Jun 20, 2025

To disclose

46 weeks

Affected · nationwide

743,13125 in this filing

Linked

8 filings

Confidence

65%

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

McLaren Health Care disclosed a cybersecurity attack targeting its computer network between July 17 and August 3, 2024. The breach was discovered on August 5, 2024, and involved unauthorized access by an international ransomware group. Approximately 743,131 individuals were affected, including 25 Maine residents. Compromised data included names, SSNs, driver's license numbers, and medical/health insurance information. McLaren engaged forensic specialists, notified regulators and credit bureaus, and provided 12 months of identity protection services.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Aug 5, 2024 → Filed with AG Jun 20, 2025319d ✗ ME AG >90d46 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 · 19 days

discovery → filing · 46 weeks / 319 days

Jul 17, 2024

Begins

Aug 5, 2024

Discovered

Jun 20, 2025

Filed

vs. sector median

+33 wks slower

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

Linked disclosures

Why this link?

Regulatory filings (7) · sorted by filing gap

Vermont State AGbd_16315e097bb33c702025-06-20Verified
New Hampshire State AGbd_277031208ce9f1ec2025-06-20Verified
Indiana State AGbd_5ca789ddf9c80c462025-06-20Verified
Massachusetts State AGbd_e1f2148c0d56b32a2025-06-20Verified

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
Industry: Healthcare

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

Discovered: Aug 5, 2024
Breach occurred: Jul 17, 2024 – Aug 3, 2024
Undetected for: 19 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 20, 2025
Affected individuals: 743,131state + nationwide
Data types: Identity (basic)Government IDHealth (basic)Financial account
Data elements: Social Security numberMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: providing written notice of this incident to relevant state and federal regulators
Initial access: exploit_public_facing

During the incident: Activated their emergency response processes
Launched an investigation with the assistance of third-party forensic specialists
Established a call center to answer questions
Undertook an extensive forensic review of the potentially impacted files
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 safeguards and training to its employees
Review our existing policies and procedures and 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: ME AG >90d · 319dME resident >180d · 319dLeak >180d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Aug 5, 2024
→ Filed with AG: Jun 20, 2025
319d 90 days ME AG >90d
Maine
Discovered: Aug 5, 2024
→ Notified: Jun 20, 2025
319d 180 days ME resident >180d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Aug 5, 2024 → Filed with AG: Jun 20, 2025	319d	90 days	ME AG >90d
Maine	Discovered: Aug 5, 2024 → Notified: Jun 20, 2025	319d	180 days	ME resident >180d

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

New Hampshire State AG+19d

Indiana State AG+19d

Massachusetts State AG+19d

Maine 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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/79a56f34-ffbe-4621-a74c-9b1e49477904.html
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: 1a3f87cce14c01f80620d98549c7f6fafa8bbc23fd27616723cec6b5341e99f6

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

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov