Most of that piece is gobbledygook to me, but I have a feeling it's something I probably ought to be concerned about...
My home internet connection is via a Sky hub, which I think is made by D-Link. Is there anything I can do/need to do to make it safe?
According to
this list, maybe depending upon the model number.
I've not yet found a source describing how VPNFilter is infecting devices - except to say it was using a vulnerability (patched in 2017) to infect mikrotik routers.
I'd suggest:
1) connect it to your computer via ethernet cable (just to make some of the later steps easier)
2) factory reset
3) chuck the latest firmware onto it*
4) change login (admin) credentials - use a good password, though be warned many routers will balk at passwords more than 12 or 16 characters
5) change the wireless network name and PSK
6) disable WPS
7) disable uPNP
8) disable remote administrative access (TR-069)
Visit
ShieldsUP!and make sure you don't have any ports open.
If there aren't any firmware upgrades available, see if there's any mention of your router in respect of
these vulnerabilities. Hopefully any relevant CVEs are already patched. If there are applicable CVEs not already fixed in your current firmware and no new firmware available, please consider replacing. I've not been in the market for an all in one router for a while, but I'd do your homework carefully before replacing it. For anyone that takes this stuff seriously, I'd recommend running separate modem, bridged to a firewall (pfSense, opnsense) and Wireless Access Point.