Kaspersky Q and A for Equation Group multiple malware program, in use early
as 1996. NSA implicated.

https://securelist.com/files/2015/02/Equation_group_questions_and_answers.pdf

Dan Goodin: How “omnipotent” hackers tied to NSA hid for 14 years­and were found at last

http://ars.to/1EdOXWo