Change Healthcare data breach, perpetrated by the Alphv/BlackCat ransomware gang, exposed the private data of approximately 190 million people, over half the U.S. population. Compromised data includes personal, medical and insurance details. UnitedHealth Group incurred $1.1 billion in costs due to the breach. Despite a major law enforcement crackdown, the attackers and their affiliates continue to cause disruption.

LockBit ransomware group falls victim to hackers itself
A data leak has disclosed information about negotiations with victims, Bitcoin wallet addresses, affiliate accounts, and details of attacks.