Use Etcher instead.
The USB-SD Creator app is unsigned, downloads unreadable compressed files from the internet, then writes data to the boot sector of a removable media device. Some forms of malware does similar things but ShitDefender isn't capable of spotting the difference.
To be fair, most AV apps are equally rubbish so ShitDefender isn't anything special here.
According to VirusTotal, the file LibreELEC USB-SD Creator is clean:
Windows updates might update the Windows Defender definitions, but those aren't active once you install an alternative AV app (as only one can be active per. Windows security rules). So it's more likely to be a heuristics update on the AV app.
I played a bit with the "shitdefender" as ya mentioned and found you can define an exception by adding the filename and path for LE Creator and seemed that solved the problem and the app ran as expected with no issues. This stuff only happens when I'm short on fiddle time doncha know. 
AI has a tendency to mark all unknown stuff as virus. Just ignore.
