MGM later said in a Securities and Exchange Commission filing that the attack and its fallout cost them around $100 million.īeyond the MGM hack, Alphv has been deployed against multiple U.S. It so successfully wormed into MGM networks that the company had to shut down substantial parts of their computer systems, leading to casino floor shutdowns, hotel keycards not working, and internal email outages. The strain of software, called Alphv, was most famously tied to the September cyberattack against MGM Resorts.
