But hackers stole other personal information, including names, contact information, driver's license numbers, Social Security numbers and passport numbers belonging to some customers who did business with MGM prior to March of 2019, he said. Hornbuckle added that no customer bank account numbers or payment card information was compromised in the incident. SEE ALSO: MGM Resorts, Atlantic City casino fully operational again after cyberattack 'We also believe that this attack is contained.' 'While we experienced disruptions at some of our properties, operations at our affected properties have returned to normal, and the vast majority of our systems have been restored,' MGM CEO Bill Hornbuckle said in a Thursday letter to customers. In 2019, the Norwegian aluminum manufacturer Norsk Hydro suffered $70 million in losses after refusing to pay ransomware criminals.

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 of its 10-day computer shutdown on Sept. MGM said that reservations and casino floors in Las Vegas and other states, including Atlantic City's Borgata, 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. SEE ALSO: MGM Resorts, parent company of Atlantic City's Borgata, dealing with cybersecurity 'issue' 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. Data breach involving Borgata's parent company expected to cost $100M

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