Supply Chain Ransomware Breach Affects 1.2 Million. A supply chain ransomware attack affecting more than 1.2 million individuals is among the largest health data breaches reported to federal regulators so far this. Data Breach Notification , Fraud Management & Cybercrime , Incident & Breach Response. Practicefirst , an Amherst, New York-based medical management services provider, on July 1 reported to federal regulators a breach that occurred late last year. Third-party company: PracticeFirst.