Sonicwall logs

Hi all

i discovered one of my Nas devices was infected over the weekend.

I'm trying to see if i can track down the source of this via router logs.

First where can i fing a list of devices connected at the time snd date

2nd Is it possible to see a log of what device connected to the nas drive on the router.

I cant see any usefu logs on the nas itself.

We have a sonicwall tz300