In its latest update on the ongoing cybersecurity incident, Change Healthcare, part of Optum and owned by UnitedHealth Group, confirmed that the attack was perpetrated by a cybercrime group called BlackCat.

"Our experts are working to address the matter, and we are working closely with law enforcement and leading third-party consultants," Change Healthcare told CNBC. "We are actively working to understand the impact to members, patients and customers."

Blackcat, also called Noberus and ALPHV, steals sensitive data from institutions and threatens to publish it unless a ransom is paid, according to the U.S. Department of Justice. Blackcat has compromised computer networks worldwide and caused hundreds of millions of dollars in losses, it said.

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