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Change Healthcare, which still is scrambling to recover from a costly cyberattack in February, may be facing a second security breach. Cybersecurity analyst Dominic Alvieri posted this week that hackers known as RansomHub claim to have accessed four terabytes of Change's data, including the personal details and medical records of "millions" of patients, and demanded payment within 12 days.

"Change Healthcare and United Health, you have one chance in protecting your clients' data," the hackers said, according to The Register, a British technology news website. "The data have not been leaked anywhere, and any decent threat intelligence would confirm that the data have not been shared nor posted. In the event you fail to reach a deal, the data will be up for sale to the highest bidder here."

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