I suspect this may have been a cyber attack. Has anyone had a similar experience, or able to share information about this phenomenon?
If this is a cyber attack does it mean my modem/router passwords have been compromised? As well as the passwords to access the miners?
Any input will be appreciated.
I have no idea what happened there, your PC could have gotten hacked. If you dont know how much has been compromized you should change all.
Especially all passwords that you used or logged in that day, the router password, PC password, delete all cookies, and install a good antivirus and clean your PC.
If it doesnt help, reinstall the OS.