Washington — 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. Private investigators looking into the breach have found hacking tools, techniques and procedures previously used in attacks attributed to Chinese hackers, said three sources who were not authorised to discuss the company’s private probe into the attack. That suggests that Chinese hackers may have been behind a campaign designed to collect information for use in Beijing’s espionage efforts and not for financial gain, two of the sources said. While China has emerged as the lead suspect in the case, the sources cautioned it was possible somebody else was behind the hack because other parties had access ...

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