Verkkounitedhealth has blamed its hack on a notorious criminal group called alphv, or blackcat, that the justice department says has been. Verkkothe wall street journal reported monday that the criminal hacking affiliate of alphv broke into change healthcareโ€™s network using stolen credentials. Verkkounitedhealth says files with personal information that could cover a โ€œsubstantial portion of people in americaโ€ may have been taken in the cyberattack.

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Verkkoa cyberattack earlier this year against a unitedhealth group subsidiary has proved costly for one of the nation's largest employers.

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