Hack attack baddies nab MICHAEL JACKSON unreleased tracks right out of Sony Music archives.

The entire Jacko back catalogue was lifted, Sony said after being infiltrated by cyber-crooks, who illegally downloaded more than 50,000 digital files.

Sony record kingpins paid $250 million to Jackson's estate in 2010 for the catalogue, including never before heard material from studio sessions when the King of Pop recorded “Off The Wall”, “Thriller” and “Bad”.

"Everything Sony purchased from the Michael Jackson estate was compromised,” a source told the UK Sunday Times.

"It caused them to check their systems and they found the breach.

"There was a degree of sophistication. Sony identified the weakness and plugged the gap."

The hackers also nabbed Jacko secret duets with Freddie Mercury of Queen and Black Eyed Peas rapper will.i.am.