Cybersecurity firm McAfee has said a group of North Korean hackers have been actively targeting “critical infrastructure” in an operation that started 18 months ago and likely did not stop during Donald Trump’s recent summit with Kim Jong-un in Vietnam.

In a new report, the company said it had found North Korean hackers attempting to gain access to as many as 80 businesses around the world, and some governments themselves. The targets of the attacks included banks, oil companies, and utilities.

Germany was reportedly on the receiving end of the largest number of attempted attacks, while other countries including Turkey were also attacked.

In the new report, McAfee said that they found numerous links between the hacking operation and Lazarus, a North Korean group connected to banking hacks. Pyongyang has denied any connection to hacking groups.

To conduct its research, McAfee said it worked with at least one unnamed government.

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