According to a report by SentinelLabs, North Korean hacker BlueNoroff is using new malicious software to attack cryptocurrency companies. The malicious software operation nicknamed "Hidden Risk" is spread through PDF files through multiple stages, using fake news headlines and crypto market research to attract users to download. The malicious software package contains multiple functions designed to provide backdoors for hackers to remotely access victims' computers and steal sensitive information, including private keys to digital asset wallets and platforms. According to cyber security firm Recorded Future, North Korean hacking groups have stolen about $3 billion since 2017.