We use an astaro v7 firewall and I have one single PC on my network that every five seconds is trying to connect to a random external IP over port 53. Internally it is using a high port number and counting up every new attempt, ie 32909, 32910, 32911... These packets are dropped every time but I would like to figure out why this is happening and how to stop it. I have run Malwarebytes and Symantec 11 with no results. He has an iphone plugged in usually but only through USB he is just charging it. Any insight anyone has would be appreciated.
08:08:13 Default DROP UDP 192.168.1.237 : 31268
→ 193.0.14.129 : 53
08:08:18 Default DROP UDP 192.168.1.237 : 31269
→ 128.63.2.53 : 53
08:08:22 Default DROP UDP 192.168.1.237 : 31270
→ 192.5.5.241 : 53
08:08:27 Default DROP UDP 192.168.1.237 : 31271
→ 128.63.2.53 : 53
And on and on.
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