Change Healthcare, which is owned by UnitedHealth, on Thursday proclaimed that the ransomware group Blackcat is behind the ongoing cybersecurity attack.

Blackcat announced on the dark web that it was behind the attack on Change Healthcare’s systems. The group said it managed to extract six terabytes of data, including information like medical records, insurance records and payment information. Blackcat, also called Noberus and ALPHV, has a reputation of stealing sensitive data from institutions and threatening to publish it unless a ransom is paid.

The attack has caused widespread disruptions to pharmacies and health systems across the U.S. Read more about this story on our LinkedIn page