At the time, Iranian authoritiees claimed that the craft had been captured using ”cyber warfare” tactics and now, an oddball account of exactly how it was done has emerged. 
According to an Iranian engineer, who claims to have led the capture of the RQ-170, it used a dream sci-fi combination of a force field and a flyer saucer to down the craft.
According to Wired, engineer Mehran Tavakoli Keshe told an online forum that his country used “advanced space technology” that he pioneered:
The craft has been air-picked-up and been put down on its belly through the use of field forces [which we take to mean force fields].
Iran did go public with claims that it has developed a flying saucer early last year, however, Wired has a more rational explanation of how the capture may have been carried out:
Iran could have captured the drone by spoofing the RQ-170′s GPS-based navigational backup systems. No force fields or saucers necessary.
We’re a big fan of all things UFO related, but this is even more unlikely than thenthe ‘alien shaped skull’ that turned up in Peru in November. That said, we like Wired’s imaginative illustration of the RQ-170 kidnap, based in the engineers taleaccount.
IranUFOdrone31 520x397 Iranian engineer: US drone captured using flying saucer and force fields
Experts have suggested that the US drone will be difficult to break into and copy, so it looks like Iran will be stuck with its flying saucer and forcefields instead.