LAS VEGAS (REUTERS) - Sony Corp Chief Executive Kazuo Hirai does not see the November cyber attack on Sony Pictures Entertainment causing major upheaval in the studio's business.

Mr Hirai on Tuesday told a round table of reporters at the Consumer Electronics Show in Las Vegas that he had signed off on all major decisions by the company in response to the attack, which the US government has blamed on North Korea.

Sony's network was crippled by hackers as the company prepared to release The Interview, a comedy about a fictional plot to assassinate North Korean leader Kim Jong Un. The attack was followed by online leaks of unreleased movies and emails that caused embarrassment to executives.

"We are still reviewing the effects of the cyber attack," Mr Hirai told reporters. "However, I do not see it as something that will cause a material upheaval on Sony Pictures business operations."

On Monday, Mr Hirai had praised employees and partners of Sony's Hollywood movie studio for standing up to "extortionist efforts" of hackers, his first public comments on the attack.