I know this isn't the case for most of you, but for those very few that aren't closely following the FBI's public service announcements:
https://www.ic3.gov/media/2018/180525.aspx
The tl;dr of it is to reboot your wireless routers / access points (unplug them, wait 30 seconds, then plug them back in - DO NOT use the recessed "reset" button), preferably on a regular basis.
For those who feel capable of doing so, changing the default password on these devices to something stronger than the manufacturer-supplied password is also advised.
Please contact me if you have further questions.
-Jared Leadbetter
Technology Specialist
Maine State Library