Bloomberg News has aĀ major storyĀ about the Chinese hacking computer motherboards made by Supermicro, Levono, and others. Itās been going on since at least 2008. The US government has known about it for almost as long, and has tried to keep the attack secret:
Chinaās exploitation of products made by Supermicro, as the U.S. company is known, has been under federal scrutiny for much of the past decade, according to 14 former law enforcement and intelligence officials familiar with the matter. That included an FBI counterintelligence investigation that began around 2012, when agents started monitoring the communications of a small group of Supermicro workers, using warrants obtained under theĀ Foreign Intelligence Surveillance Act, or FISA, according to five of the officials.
Thereās lots of detail in the article, and I recommend that you read it through.