Governments will build millions of slightly-different evolving automated versions. This Gray Goo ( http://en.wikipedia.org/wiki/Grey_goo ) will be dropped inside a hostile state. Currently probably Iran. Or China even?

The bots will try to profit off the economy of the hostile state. When successful profit-schemes have been found, other bots will be notified so they too can maximize profit. All profit will be turned in to Bitcoins. These Bitcoins will be "destoryed" (lost inside untracable wallet files). Thereby slowly grinding the economy to a halt as all money is drained away by these automatons. Descending the state into revolt and then anarchy.