Move the .dmg file to the Trash and empty it.
These files often use social engineering to convince you to bypass macOS security settings (right-clicking to "Open" despite "unidentified developer" warnings). Recommended Actions spring blossom 2020 - Downloader.dmg
If you have already opened the file, run a scan with a reputable tool like Malwarebytes for Mac to check for lingering LaunchAgents or browser extensions. Move the
This is a macOS disk image. If you are on a Windows or Android device, this file cannot run, but its presence suggests a targeted attempt at Mac systems. Associated Risks this file cannot run