DataBreaches.Net

Menu
  • About
  • Breach Notification Laws
  • Privacy Policy
  • Transparency Report
Menu

McLaren Health Care notifying 2.2 million patients about the BlackCat attack in August

Posted on November 10, 2023 by Dissent

On September 30, AlphV threat actors (aka BlackCat) added McLaren Health Care to their dark web leak site. They updated their listing on October 4, claiming to have data on 2.5 million people. That same week, McLaren confirmed that they had been the victim of a ransomware attack it first detected on August 22. Michigan’s Attorney General Nessel also issued a press release that week to inform citizens and provide them with steps to take to remain vigilant and protect themselves.

While McLaren confirmed an attack and was able to provide some preliminary information, they did not have any specific numbers and sent a marker “501” report to HHS to indicate that they knew more than 500 patients had been affected and that a report was required.

This week McLaren notified the Maine Attorney General’s Office that a total of 2,192,515 people were affected by the incident. A copy of their notification letter was also submitted to the California Attorney General’s Office.

From their notification letter:

On August 31, 2023, we learned the unauthorized actor had the ability to acquire certain information stored on the network during the period of access. The information impacted varied by individual and not all information was available for every individual. The information that may have been impacted includes some combination of certain individuals’ names and the following: Social Security number, health insurance information, date of birth, and medical information including billing or claims information, diagnosis, physician information, medical record number, Medicare/Medicaid information, prescription/medication information, diagnostic and treatment information.

McLaren is offering those affected complimentary mitigation services through IDX.  Information is available on IDX’s website for this incident. Letters are also being mailed directly to individuals affected by this breach. For more information or assistance with questions regarding this incident, McLaren asks that people please call IDX at (888) 867-1630, scan the QR code in the notification letter, or go to IDX’s site for the incident.

Category: Breach IncidentsHealth DataU.S.

Post navigation

← Optus loses court bid to keep report into cause of cyber-attack secret
Butte School District shuts down computer network after system compromised →

Now more than ever

"Stand with Ukraine:" above raised hands. The illustration is in blue and yellow, the colors of Ukraine's flag.

Search

Browse by Categories

Recent Posts

  • Nova Scotia Power hit by cyberattack, critical infrastructure targeted, no outages reported
  • Georgia hospital defeats data-tracking lawsuit
  • 60K BTC Wallets Tied to LockBit Ransomware Gang Leaked
  • UK: Legal Aid Agency hit by cyber security incident
  • Public notice for individuals affected by an information security breach in the Social Services, Health Care and Rescue Services Division of Helsinki
  • PowerSchool paid a hacker’s extortion demand, but now school district clients are being extorted anyway (3)
  • Defending Against UNC3944: Cybercrime Hardening Guidance from the Frontlines
  • Call for Public Input: Essential Cybersecurity Protections for K-12 Schools (2025-26 SY)
  • Cyberattack puts healthcare on hold for hundreds in St. Louis metro
  • Europol: DDoS-for-hire empire brought down: Poland arrests 4 administrators, US seizes 9 domains

No, You Can’t Buy a Post or an Interview

This site does not accept sponsored posts or link-back arrangements. Inquiries about either are ignored.

And despite what some trolls may try to claim: DataBreaches has never accepted even one dime to interview or report on anyone. Nor will DataBreaches ever pay anyone for data or to interview them.

Want to Get Our RSS Feed?

Grab it here:

https://databreaches.net/feed/

RSS Recent Posts on PogoWasRight.org

  • Apple Siri Eavesdropping Payout Deadline Confirmed—How To Make A Claim
  • Privacy matters to Canadians – Privacy Commissioner of Canada marks Privacy Awareness Week with release of latest survey results
  • Missouri Clinic Must Give State AG Minor Trans Care Information
  • Georgia hospital defeats data-tracking lawsuit
  • No Postal Service Data Sharing to Deport Immigrants
  • DOGE aims to pool federal data, putting personal information at risk
  • Privacy concerns swirl around HHS plan to build Medicare, Medicaid database on autism

Have a News Tip?

Email: Tips[at]DataBreaches.net

Signal: +1 516-776-7756

Contact Me

Email: info[at]databreaches.net

Mastodon: Infosec.Exchange/@PogoWasRight

Signal: +1 516-776-7756

DMCA Concern: dmca[at]databreaches.net
© 2009 – 2025 DataBreaches.net and DataBreaches LLC. All rights reserved.