LOS ANGELES - Sony Pictures Entertainment is to name North Korea as the source of a massive computer attack that has led to leaks ranging from budget and salary numbers to five movies online, Bloomberg reported, citing a source.

The studio is considering whether to announce the findings publicly, the person familiar with the discussions told Bloomberg.

Technology website Re/code also reported on Wednesday that Sony would make the announcement about the perpetrators of the attack.

In June, the Pyongyang government had denounced a Sony film as "undisguised sponsoring of terrorism, as well as an act of war".

Sony is due to release The Interview, a comedy starring James Franco and Seth Rogen as two journalists recruited by the CIA to assassinate North Korean leader Kim Jong Un, on Dec 25.

Bloomberg quoted another unidentified source as saying Sony's probe into the Nov 24 hacking has linked the hackers to a North Korean group known as DarkSeoul, which was responsible for similar attacks on South Korean banks and television studios last year.

But Reuters reported a United States national security officials as saying government agencies still had not determined whether North Korea was responsible for the Sony attack.