The hackers who attacked UnitedHealth Group’s Change Healthcare unit were in the company’s networks for more than a week before they launched a ransomware strike that has crippled vital parts of the U.S. healthcare system since February.
The hackers who attacked UnitedHealth Group’s Change Healthcare unit were in the company’s networks for more than a week before they launched a ransomware strike that has crippled vital parts of the U.S. healthcare system since February.