https://www.bloomberg.com/news/features/2018-10-04/the-big-hack-how-china-used-a-tiny-chip-to-infiltrate-america-s-top-companies
Nested on the servers¡¯ motherboards, the testers found a tiny microchip, not much bigger than a grain of rice, that wasn¡¯t part of the boards¡¯ original design. Amazon reported the discovery to U.S. authorities, sending a shudder through the intelligence community. Elemental¡¯s servers could be found in Department of Defense data centers, the CIA¡¯s drone operations, and the onboard networks of Navy warships. And Elemental was just one of hundreds of Supermicro customers.
During the ensuing top-secret probe, which remains open more than three years later, investigators determined that the chips allowed the attackers to create a stealth doorway into any network that included the altered machines. Multiple people familiar with the matter say investigators found that the chips had been inserted at factories run by manufacturing subcontractors in China.
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