http://www.reuters.com/article/2015/02/17/us-usa-cyberspying-idUSKBN0LK1QV20150217
The U.S. National Security Agency has figured out how to hide spying software deep within hard drives made by Western Digital, Seagate, Toshiba and other top manufacturers, giving the agency the means to eavesdrop on the majority of the world's computers, according to cyber researchers and former operatives.


http://www.theregister.co.uk/2015/02/17/kaspersky_labs_equation_group/
Kaspersky's analysis says the NSA made a breakthrough by infecting hard disk firmware with malware known only as nls_933w.dll capable of persisting across machine wipes to re-infect targeted systems.

.dll? Oh, wait...