In February 2019, Palo Alto Networks Unit 42 researchers identified spear phishing emails sent in November 2018 containing new malware that shares infrastructure with playbooks associated with North Korean campaigns. The spear phishing emails were written to appear as though they were sent from a nuclear security expert who currently works as a consultant for in the U.S. The emails were sent using a public email address with the expert’s name and had a subject referencing North Korea’s nuclear issues.