The ALPHV/BlackCat ransomware gang has claimed responsibility for a cyberattack on the UnitedHealth Group (UHG) subsidiary, Optum Solutions. Optum manages the Change Healthcare platform, a major payment exchange system in the US healthcare network, which was impacted by this attack.
Change Healthcare had to disconnect its systems, causing delays in retail pharmacy chains and some hospitals. In response, UHG distributed workarounds as it works to restore systems.