You might want to check with some industrial controls guys that know Modbus.
I don't run into Modbus much at work but here's what I do know. Mosbus is shit. If a light is red, check the communication cables.
In your opinion, what's the best way to find and remove malware for the average user?
I currently use Malwarebytes and windows defender. I'm wondering if this is enough or should I change something?