[SodaCan5]

Since most computers have anti-virus software isn't it difficult to spread RATs to windows computers since they will get detected?
Also, is it any easier to spread them to smartphones?

[Ph4n70M Phr34K]

Since most computers have anti-virus software isn't it difficult to spread RATs to windows computers since they will get detected?

Yes and no. It depends. Everything can be difficult, the same way everything can be trivial. The keywords are practice and experience. That's exactly how "difficult" turns into "easy".
Nowadays its much more difficult than it used to be. But its not hard to learn the way around.

Also, is it any easier to spread them to smartphones?

Nope. First of you won't even get a functional malware for mobile devices, unless you do a research on cyber-crime forums - outside of specialized cyber-crime forums you will only find poor fakes and broken, worthless mobile malware.

Secondly, in most cases your mobile malware won't even land on a mobile device. Usually you need a legit application that with time fetches your malware and install it as "update". However there are also work-around for it as for everything.

[SodaCan5]

Good info and thanks for expanding on it so well. Still earning over here so I appreciate the knowledge.