Stuxnet emerged earlier this year as apparently the first widespread worm that detects and infiltrate industrial control systems. Some believe that it was created specifically to attack Iran, although networks in other countries have also been infected. Microsoft recently also confirmed Stuxnet exploits four flaws in Windows.Update 2-Oct-2010: Authorities in Iran indicate suspects have been arrested in conjunction with the Stuxnet attack.
→ More - Iran Successfully Battling Cyber Attack (tehrantimes.com)
→ See also - Signed Rootkits .LNK'd to Zero Day (antivirus.about.com)