According the recently-leaked NSA documents, following the 2010 Stuxnet attack against Iranian nuclear facilities and the Wiper attacks against Iranian oil refinaries, Iran was able to reverse engineer and repurpose the malware for its own purposes, which it then used against Saudi Arabian oil company Aramco in 2012 with the Shamoon attack suite.
Just as the U.S. showed its hand at the end of World War 2 by dropping two atomic bombs on Japan (and thus starting the Cold War), America has again been first out of the gate with a new type of weapon, which is subsequently copied. The problem is that today’s “nukes” are nowhere near as difficult to create and the supplies are readily available. Imagine how the Cuban Missile Crisis would have played out if there were drastically more nuclear-armed powers in play. It will be interesting to see how the development of cyber weapons and their subsequent reuse will alter the course of future warfare and provide non-state actors with serious cyber firepower.