The cyberattackers who targeted UnitedHealth’s Change Healthcare business were in the company’s networks for over a week before they launched an attack that has crippled vital parts of the U.S. healthcare system since February, the Wall Street Journal’s James Rundle reports. The hackers, who identified themselves as the ALPHV ransomware group or one of its affiliates, access Charge’s network on February 12 and used compromised credentials on an application that lets workers remotely access systems, the author says, citing a person familiar with the cyber investigation.
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