LAN to WAN Attack in Secureport

Secureport shows an "Attack" with the Source address being one of my internal workstations (192.168.nnn.nnn), and the destination a WAN address: 138.201.57.222.

I am not able to identify the purpose of the connection to 138.201.57.222
Nor can I identify why Zyxel considers the connection an "Attack".

How do I find out why is this considered an "Attack"?
What is 138.201.57.222?

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