Kaspersky Lab has recorded over a dozen Duqu incidents, and the overwhelming majority of victims were located in Iran. The authors of the Trojan program once again wiped their servers around the world. They attempted to fix the errors made on 20 October during their first server wipe (covered in Part 6 of the blog posts on Duqu). The authors most likely used their own framework developed in a programming language unknown to us. The developers of Tilded will most likely continue their work and we will have to deal with their program in the future (possibly very soon)”]
Source: https://securelist.com/monthly-malware-statistics-february-2012/36526/