I replied to the thread you have screenshot before it was deleted. I ran the linked firmware through VirusTotal, which alerted to it being a backdoor/trojan.
In this space especially, people need to be extremely cautious about everything they bring into their network environment. Only takes one mistake to have a realllly bad time.
I think it's important people should also realise that a virus check has no guarantee to find a virus - so if you do grab some software from somewhere and it passes your virus program check, that doesn't mean it doesn't have a virus.
Virus checkers only check for known viruses, so if someone makes a download and writes a new as yet unknown virus to put in it, it's possible to pass any virus program checks.