Grupo Fleury is the largest medical diagnostics company in Brazil, with over 200 service centers and more than 10,000 employees. The company performs approximately 75 million clinical exams in a year. The Fleury website began displaying an alert warning that they suffered an attack and that systems are no longer accessible. With their systems shut down, business operations are disrupted, and patients are unable to schedule lab tests or other clinical exams online. Ransom operation known as REvil is known for stealing files before encrypting devices and then using the stolen data as leverage to get a company to pay the ransom.
Source: https://www.bleepingcomputer.com/news/security/healthcare-giant-grupo-fleury-hit-by-revil-ransomware-attack/