The attack mechanism is a UPnP router that is happy to forward requests from one external source to another (in violation of UPnP behavior rules). Using the UPnP router returns the data on an unexpected UDP port from a spoofed IP address, making it more difficult to take simple action to shut down the traffic flood.
https://www.darkreading.com/new-ddos-attack-method-leverages-upnp/d/d-id/1331799
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