The FBI on Thursday issued a public notice warning U.S. businesses of attempts by North Korean hackers to extort data and hold stolen proprietary data and code hostage until the companies involved meet ransom demands.

“North Korean IT workers have copied company code repositories, such as GitHub, to their own user profiles and personal cloud accounts. While not uncommon among software developers, this activity represents a large-scale risk of theft of company code,” the FBI said.

The warning adds that North Korean IT workers “could attempt to harvest sensitive company credentials and session cookies to initiate work sessions from non-company devices and for further compromising opportunities.”

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