There are no viruses in Shotcut downloads provided through our web site. Read the claim made at the top of our download page: https://shotcut.org/download/
From where did you download Shotcut? We cannot control sites other than the ones we upload to and publish on that page. All of our files are scanned before upload and then scanned again by FossHub (one of the 2 download sites).
Look at the FossHub Shotcut page, which appears when you download through it: https://www.fosshub.com/Shotcut.html
It has virus scan results. Both download locations also publish file checksums so you can compare the file that appears on your system after downloaded was not tampered with. How do you know your computer did not implant the virus?
If you know anything about virus scanners, you know they are far from perfect and frequently mis-flag something.
Anyways, you can remove the flagged DLL; Shotcut does not need it.