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The US Justice Department accused three North Korean military intelligence officials Wednesday of a campaign of cyberattacks to steal $1.3 billion in crypto and traditional currencies from banks and other victims.

“North Korea’s operatives, using keyboards rather than guns, stealing digital wallets of cryptocurrency instead of sacks of cash, are the world’s leading bank robbers,” said Assistant Attorney General John Demers in a statement.

The three created malicious cryptocurrency applications, opening backdoors into victims’ computers; hacked into companies marketing and trading digital currencies like bitcoin; and developed a blockchain platform to evade sanctions and secretly raise funds, the department said.

The case filed in federal court in Los Angeles builds on 2018 charges against one of the three, Park Jin Hyok, who was charged at that time with the hack of Sony pictures four years earlier, the creation of the WannaCry ransomware, and the 2016 theft of $81 million from the central bank of Bangladesh.

The new charges add two more defendants, Jon Chang Hyok and Kim Il, with the allegations saying the three worked together in the North Korean military intelligence hacking group, the Reconnaissance General Bureau.

Among the cybersecurity community, that body is also known as the Lazarus Group and APT 38.

In addition to the earlier charges, the three engaged in operations out of North Korea, Russia and China to attempt to steal $1.3 billion by hacking computers using spearfishing techniques and promoting cryptocurrency applications loaded with malicious software that allowed them to access and empty victims’ crypto wallets, the charges said.

They also allegedly hacked into and robbed digital currency exchanges in Slovenia and Indonesia and extorted a New York exchange of $11.8 million.