https://www.cnbc.com/2018/12/06/clues-in-marriott-hack-are-said-to-implicate-china.html

Hackers behind a massive breach at hotel group Marriott International left clues suggesting they were working for a Chinese government intelligence gathering operation, according to sources familiar with the matter.

Marriott said last week that a hack that began four years ago had exposed the records of up to 500 million customers in its Starwood hotels reservation system.