Stuxnet is a malicious computer worm believed to be a jointly built American-Israeli cyber weapon. Although neither state has confirmed this openly, anonymous US officials speaking to the Washington Post claimed the worm was developed during the Obama administration to sabotage Iran’s nuclear program with what would seem like a long series of unfortunate accidents.

Source: Stuxnet – Wikipedia, the free encyclopedia

Here’s a great a podcast episode that gets into the details of the very interesting Stuxnet case.