Common culprits noted on the site so far are amazon firesticks with additional apps added, smart tvs. Also implicated are systems set up to use the Hola Free vpn, which is not a vpn but a method of sharing your network with others.
_________________________________________________________ Graham I am a VM customer. There are no guarantees that my advice will work.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.
Please don't say that. You mustn't just let your system send spam out to the world. If you can't do it yourself, we will talk you through it. We have had many others in the forum who thought they could not do it, but in the end they followed the steps and solved the problem.
You can get a friend or relation or a local expert to assist in your home as well.
Remember - the malware may be harvesting data from you as well as sending spam to all and sundry.
(p.s. You started off this thread saying you were not impressed with Virgin - well I won't be impressed with you Colonel, if you retreat at the first sign of a fight!)