A precision digital weapon reportedly created by the US and Israel to sabotage Iran’s nuclear program had a fraternal twin that was designed to attack North Korea’s nuclear program as well, according to a new report.

The second weapon was crafted at the same time Stuxnet was created and was designed to activate once it encountered Korean-language settings on machines with the right configuration, according to Reuters. But the operation ultimately failed because the attackers were unable to get the weapon onto machines that were running Pyongyang’s nuclear weapons program.

WIRED reported back in 2010 that such an operation against North Korea would be possible in light of the fact that some of the equipment used by the North Koreans to control their centrifuges—the devices used to turn uranium hexafluoride gas into nuclear-bomb-ready fuel—appeared to have come from the same firms that outfitted the Iranian nuclear program.

“The computer-control equipment North Korea got was the same Iran got,” David Albright, the president of the Institute for Science and International Security and a long-time watcher of both nuclear programs, told WIRED at the time.

Albright published a study back then noting that the North Korean control system “is dual use, also used by the petrochemical industry, but was the same as those acquired by Iran to run its centrifuges.”