The mystery of Duqu Framework solved

Краткие выводы:

• The Duqu Framework consists of “C” code compiled with MSVC 2008 using the special options “/O1” and “/Ob1”
• The code was most likely written with a custom extension to C, generally called “OO C”
• The code was written by a team of experienced, “old-school” developers.

https://www.securelist.com/en/blog/677/The_mystery_of_Duqu_Framework_solved