Kaspersky Lab researchers who have been rooting into the code of the Flame toolkit since its discovery believe to have unearthed definitive proof that, at one point in time, the developers of both Stuxnet/Duqu and Flame worked together.
Although it has never been confirmed, the speculation that the Stuxnet worm was manufactured for the express reason of disrupting the production at Iran's Natanz uranium enrichment facility is considered to be correct by many security experts.
Industrial control systems (ICS), distributed control systems (DCS), supervisory control and data acquisition systems (SCADA) have all been around for decades, but thanks to Stuxnet, DuQu and other major incidents, these systems have recently began receiving serious security consideration.
Stuxnet and Duqu have made quite an impact on the security community when they were discovered, and are still considered to be two of the most sophisticated pieces of malware known to the greater public.
An installer for the Duqu Trojan has been discovered by CrySys, the Hungarian firm that initially discovered the threat, and the file has shed some light onto how the threat managed to find its way to the targeted computers.