Because the driver is test-signed and not submitted to Microsoft’s WHQL program. It is not a virus . Add an exclusion in Defender if needed.
These devices use a proprietary bootloader and require specific USB drivers to establish a data link between the phone and a Windows PC. Sc6533g Usb Driver -UPD-
via the "Startup Settings" in the recovery menu before trying again. Device Disconnecting Because the driver is test-signed and not submitted
Manually installing USB driver in Windows · Issue #1066 - GitHub Sc6533g Usb Driver -UPD-