Avast virus VBS: Malware-gen?

rekordbox certainly doesn't have anything that would be considered malware. The closest I could guess would be your security software thinking the network traffic being generated is harmful, but that wouldn't be a malware item, more of a firewall concern.

It's possible you already have a malware / viral infection in your computer and this is turning up as the result -- I can see that the "object" that is infected is a file in the temporary folder. Consider using a tool like CCleaner to do some housekeeping (including wiping out all your temporary files), then run Malwarebytes Antimalware to check for any nasties. Yes, you are using Avast, and it works just fine, but sometimes running a secondary scan can find things the first does not.