How to block massive UDP traffic?

First, i’m not a network expert. But i need to solve a problem with the network of my company.

Some strange traffic is consuming almost all the bandwith. We have a Mikrotik router, and using the utility torch in winbox i found this outgoing UDP traffic; multiple unknow source ips and one destination ip, that belongs to the ISP.

Is there a way of blocking all this UDP traffic and not causing a new problem?

port 53 :slight_smile:
Search for DNS Amplification
And fix your firewall on input chain!