If so, it could be the costliest ransomware attack on record, said Brett Callow of the cybersecurity firm Emsisoft.
The incident bore all the hallmarks of an extortionary ransomware attack, which MGM has not confirmed. The company announced the end its 10-day computer shutdown on Sept. MGM said that reservations and casino floors in Las Vegas and other states were affected as customers shared stories on social media about not being able to make credit card transactions, obtain money from cash machines or enter hotel rooms.
10, led to MGM shutting down some casino and hotel computer systems at properties across the U.S. The incident, which was detected on Sept. NEW YORK - The data breach last month that MGM Resorts is calling a cyberattack is expected to cost the casino giant more than $100 million, the Las Vegas-based company said.
