Cyberattack Shuts Down 14 Facilities at Largest Healthcare System in MI

October 2, 2023


McLaren Healthcare in Michigan reported outages affecting billing and electronic health record systems. According to the Detroit Free Press, McLaren had to shut down the computer network at 14 different facilities — a situation that got so bad that employees had to communicate through their personal phones. The Black Cat/AlphV ransomware gang claimed to have stolen 6 TB of data.

UPDATE: 13 November: McLaren reports Black Cat stole data on 2.2 million patients.

Incident Date

September 5, 2023

Estimated Cost

Systems down at 14 sites

Type of Malware

No Malware identified

Threat Source