United Healthcare Security Breach 2025. 12 by using stolen login credentials that gave them remote access to its network, the largest u.s. On february 21, 2025, change healthcare became aware of deployment of ransomware in its computer system.

Unitedhealth group on monday said it paid ransom to cyberthreat actors to try and protect patient data, following the february cyberattack on its subsidiary change. According to unitedhealth chief executive andrew witty, the hackers broke into change healthcare’s network using a set of stolen credentials to an internal system that was.