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The attack, which began on Sunday, knocked out slot machines at ARIA and disrupted hotel room locks in the Bellagio on the Las Vegas Strip, though the full extent of the impact remained unclear.
The ALPHV/BlackCat ransomware group claimed responsibility for the MGM Resorts cyber outage on Tuesday, according to a post by malware archive vx-underground.
Reports by tech websites are citing social media posts that a group known as ALPHV -- also known as BlackCat -- compromised MGM Resorts through a simple phone call impersonating an employee on the IT staff.
The Las Vegas casino company, which still has many of its computer systems offline, has not characterized what happened as a cyberattack.
With limited information coming from MGM Resorts and the FBI, speculation has begun on some tech and media websites about who is behind the hack that has disrupted Nevada's largest employer.