MGM Resorts and Caesars Entertainment were compromised by data breaches within weeks of each other.
Scattered Spider, the hacking group, tricks people into handing over access to private systems.
A cybersecurity expert says Scattered Spider is comprised of mostly young adults from the US and UK.
MGM Resorts followed suit, filing its own Form-8K with the SEC.
MGM Resorts and Caesars Entertainment both did not immediately respond to Insider's request for comment.
Persons:
Charles Carmakal, Carmakal
Organizations:
MGM Resorts, Caesars Entertainment, US, Service, MGM, Las Vegas . Bloomberg, Caesars, Bloomberg, CNBC, TechCrunch, Mandiant Inc, Google, LinkedIn, US Securities and Exchange Commission, SEC, US Treasury Department
Locations:
Wall, Silicon, Las Vegas, New York, Vegas, United States