The hack of Sony Pictures Entertainment has resulted in the exposure of about 47,000 Social Security numbers, including those of Hollywood celebrities, according to NBC.

A security firm, Identity Finder, said in a post Friday the stolen numbers appeared more than 1.1 million times in the 601 files stolen and posted by the hackers.

This is the latest revelation on the hack that included the release of five upcoming Sony releases, such as the movies "Annie" and "The Interview."

The hackers who posted all the information are calling themselves the "Guardians of Peace" and U.S. officials suspect, but have not been able to confirm, a connection to the North Korean government.

The country has been unreceptive. Officials even threatened war if the move "The Interview" is released, since it involves the killing of Kim Jong-Un, the current leader of the country.

In June, after the trailer was released, a North Korean foreign ministry spokesman was quoted as saying the release of the film would be an "act of war," according to BBC.

"Making and releasing a movie on a plot to hurt our top-level leadership is the most blatant act of terrorism and war and will absolutely not be tolerated," the spokesman said.

But the quantity of data stolen in the hack is larger than the movie.

"The most concerning finding in our analysis is the sheer number of duplicate copies of Social Security numbers that existed inside the files," wrote Identity Finder CEO Todd Feinman.

The hack may have also revealed other information such as salaries, birth dates and email addresses.

The FBI is investigating the hack because of the alleged threatening emails sent to Sony employees after the information was stolen.

The emails demand compliance by the employees, but exactly what the hackers are demanding is unclear.

"Please sign your name to object the false of the company at the email address below if you don't want to suffer damage. If you don't, not only you but your family will be in danger," the email said.