How do worms spread on a local network?

Question

Computer networks

I'm wondering how worms spread on a local network, how does it work?
Is it possible for the worm to spread over other networks (WiFi, Bluetooth)?
Can viruses be multiplatform?
I would be very grateful for the answers.
You can not troll like going to hack the whole world, no. I'm just curious.

Answer 1

In short:
1. Many options: exploitation of vulnerabilities, mimicry for documents on balls, etc.
2. Yes, but with features. For example, it can make an attempt to send its body to all available devices via Bluetooth. A worm can hack into your router from your home network and change DNS or add it to another botnet
3. Yes, but this is extremely uneconomical. Here, usually the Trojan loader loads the version for the desired platform.