BIOS and Hardware

Hardware
"Leaked Documents Show NSA Compromising Computer Hardware And Communication Technology On A Massive Scale"

http://www.techdirt.com/articles/20131230/09221925711/leaked-documents-show-nsa-compromising-computer-hardware-communication-technology-massive-scale.shtml

BIOS is also infected

"These are all products of the Advanced/Access Network Technology (ANT) division of the NSA’s Tailored Access Operations (TAO) elite hacker unit. According to the article, ANT also has techniques for infecting BIOS firmware, the instructions that run when a computer starts up, in order to enable long-term, undetected spying."

http://gigaom.com/2013/12/29/nsas-backdoor-catalog-exposed-targets-include-juniper-cisco-samsung-and-huawei/