Two Ransomware Hacks Affect 1.1 Million Patients

Hackers Hit Maryland Medical Group and California Hospital, Claim 480 GB Data Theft Marianne Kolbasuk McGee (HealthInfoSec) • April 25, 2025

Two separate ransomware hacks of a Maryland medical group and a California hospital resulted in data thefts affecting more than 1.1 million patients, according to recent reports to regulators. Cybercriminals claim to have leaked 480 gigabytes of data from one of the attacks.

Frederick Health in a report filed on March 28 to the U.S. Department of Health and Human Services said 934,326 people were affected by its hacking incident early this year. The Maryland-based medical group said the breach involved a Jan. 27 ransomware incident affecting its IT systems and exfiltration of data.

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As of Friday, no specific ransomware gang appeared ...