"While some computer experts still express doubts whether the North was actually behind the attack, American officials said it was similar to what was believed

"While some computer experts still express doubts whether the North was actually behind the attack, American officials said it was similar to what was believed to be a North Korean cyberattack last year on South Korean banks and broadcasters. One key similarity was the fact that the hackers erased data from the computers, something many cyberthieves do not do." I won't pretend to be an expert on information security but surely this isn't anywhere close to being unique enough to point blame at North Korea?