According to TechCrunch, Microsoft security experts said that North Korean hackers have successfully infiltrated hundreds of companies around the world by impersonating venture capitalists, recruiters and IT staff, using false job-seeking identities and relying on US intermediaries to circumvent international sanctions. The report shows that the hacker groups "Ruby Sleet" and "Sapphire Sleet" spread malware by faking virtual meetings and recruitment tasks, respectively, and stole more than $10 million in crypto assets in at least six months. Especially during the epidemic, remote work has become a new breakthrough for hacker infiltration.