Bloomberg said the hackers first targeted the hotel and entertainment giant in late-August by breaching one of its outside IT vendors. Reports this week claim that Scattered Spider (also known as UNC3944) was also behind a recent cyberattack on hotel and casino giant Caesars Entertainment, which Bloomberg reported on Wednesday citing sources familiar with the event. It’s not yet known what, if any data, was exfiltrated from MGM’s systems. The dark web leak site on which ALPHV typically posts files stolen from victim organizations has not yet listed MGM.

News of the claim of responsibility was first reported by the malware repository collective vx-underground, which on Wednesday said that Scattered Spider, believed to be a subgroup of the ALPHV ransomware gang, was responsible. Scattered Spider claims responsibility for MGM breachĪ representative for the hacking group known as Scattered Spider told TechCrunch that it was behind the MGM cyberattack. The site also says that MGM is waiving change and cancellation fees for guests arriving until September 17. MGM’s website, which on Tuesday advised guests to call in order to make reservations, now tells customers to use its Rewards app for bookings. Guests have also reported that TV service is down in hotel rooms, along with MGM’s phone lines. Recent reports on social media show that MGM’s casinos remain out of action and that large queues formed at affected properties as staff have resorted to relying on pen and paper. The outage has now rolled into its fourth day, with MGM saying in an update on Thursday that the company was working to “resolve our cybersecurity issue.” Guests continue to report issues across MGM properties, despite the company claiming earlier in the week that its resorts, including dining, entertainment and gaming, are “currently operational.” This resulted in widespread disruption across the company’s hotels and casinos, with guests reporting that ATMs and slot machines are out of order, along with room digital key cards and electronic payment systems. MGM, which operates a number of hotels and casinos on the Las Vegas Strip, including the Bellagio, Aria and Cosmopolitan, shut down large parts of its internal networks on Sunday. Hotel and entertainment giant MGM Resorts continues to battle a widespread outage after a cyberattack forced it to shut down systems across its properties.

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