Re: 28 Days Later... have Bloomberg just picked up on this?
The bloomberg article, for which they have 17 well placed sources - inside Amazon, Apple and the US government is that they discovered three years ago that Supermicro boards had been modified at the production line in china with the addition of a tiny chip which added a backdoor to the system. What's missing from the article is the sort of technical detail we would all like.
https://www.bloomberg.com/news/features/2018-10-04/the-big-hack-how-china-used-a-tiny-chip-to-infiltrate-america-s-top-companies