Ransomware attack shut down Universal Health Services, a network of hospitals. The attack occurred in the wee hours of the morning on Monday, according to reports coming in from employees on Reddit and other platforms. One employee told BleepingComputer that encrypted files are being appended with the.RYK extension; and, a ransom note that showed up on all affected computers referenced the phrase Shadow of the Universe which is known to be included in Ryuk ransom notes. UHS didn t mention what kind of attack it suffered, but other information coming from workers seems to point to the culprit.
Source: https://threatpost.com/universal-health-ransomware-hospitals-nationwide/159604/