What region are you located?
I recommend that you phone contact your regional D-Link support office and ask for help and information regarding this. We find that phone contact has better immediate results over using email.
Let us know how it goes please.
Hello, I am located in France.
I believe having solved the problem though. But with a doubt.
I do not agree with the begining of this topic, the author resetting the modem is a bad idea.
On the contrary I think the problem is the default setting on accepting some incoming WAN requests. I disabled this but strangely the Wan settings page don't appear again.
So now I am stealth according GRC ShiedsUp Tests as before with my ancient USB ADSL modem, and with a permanent open D-LinK Status Page I can control the problem is fixed, unless temporarily.
I got non infection in that period in what is possible to detect now.