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Federal agencies, health care associations, and security researchers are warning that a ransomware group tracked under the name Black Basta is ravaging critical infrastructure sectors in attacks that have targeted more than 500 organizations in the past two years.

One of the latest casualties of the native Russian-speaking group, according to CNN, is Ascension, a St. Louis-based health care system that includes 140 hospitals in 19 states. A network intrusion that struck the nonprofit last week ​​took down many of its automated processes for handling patient care, including its systems for managing electronic health records and ordering tests, procedures, and medications. In the aftermath, Ascension has diverted ambulances from some of its hospitals and relied on manual processes.

“Severe operational disruptions”

In an Advisory published Friday, the FBI and the Cybersecurity and Infrastructure Security Agency said Black Basta has victimized 12 of the country’s 16 critical infrastructure sectors in attacks that it has mounted on 500 organizations spanning the globe. The nonprofit health care association Health-ISAC issued its own advisory on the same day that warned that organizations it represents are especially desirable targets of the group.