The allegation may impact joint statement adopted at the DPRK-U.S. Summit, North Korea warned.
General Kim Yong Chol was also blamed for deadly attacks against South Korean targets in 2010.
Nine former employees sued Sony for identify theft and personal losses.
"I'm over trying to find the 'adorable' way to state my opinion and still be likable! F*** that."
Anonymous senior administration officials tell The Washington Post that formally blaming China is not worth revealing its own cyberespionage capabilities.
WikiLeaks on Thursday released an online searchable database of more than 30,000 documents obtained by hackers in a massive cyber attack last year.
Tech leaders who are at odds with the administration over government surveillance stayed away from his speech.
Comey calls hackers "sloppy," says they failed to mask their IP addresses.
The additional sanctions target three companies as well as 10 North Korean government officials.
In The Interview's latest chapter, a corrupt app will steal your bank details instead of downloading the film
"Obama always goes reckless in words and deeds like a monkey in a tropical forest," an unnamed spokesman for the commission said in a statement carried by the official KCNA news agency.
"We are a country that believes in free speech, and the right of artistic expression."
North Korea's Internet was cut off for several hours on Tuesday
For the first time, the Security Council will debate human rights in the secretive Communist state, but don't expect any action.
The president discussed the Sony hack, the Castros and race in America at his final press conference of 2014
The president said he thought Sony made a mistake by canceling the release of the movie "The Interview."
A Google executive wrote a blog post criticising the organisation based on leaks from the Sony hack