N.Korea hackers stole S.Korea-U.S. military plans to wipe out N.Korea leadership -lawmaker

* Plans to target N.Korea leadership hacked-lawmaker

* Hacked material unlikely to compromise S.Korean military

* S.Korea defence will not confirm contents of hacked data

* N.Korean agents tried to phish U.S. utilities - security firm

* U.S. power supply not disrupted by attack, cyber firm says