WASHINGTON—Hackers tied to the North Korean government are trying to rob banks across the globe by draining ATMs and initiating fraudulent money transfers, in an effort by the cash-strapped Pyongyang regime to fund its nuclear weapons program, multiple federal government agencies warned on 26 August.

The campaign includes so-called spearphishing attacks—which use fraudulent email to infect a computer or persuade the victim to reveal a password or other information—and social engineering schemes. It has been underway since at least February and represents a resurgence of operations after an apparent lull in bank robberies by North Korea last year, the Federal Bureau of Investigation, Department of Homeland Security,US Treasury Department and US Cyber Command said in a joint statement.