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.

Inspect your browser (Safari/Chrome/Firefox) for any extensions you don't recognize and remove them.

Legitimate software rarely includes "Downloader" in the actual filename of a disk image ( .dmg ). This usually indicates a stub installer that, once opened, downloads and installs additional (often malicious) payloads.

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" is designed to look like a screensaver, wallpaper pack, or harmless utility.

Hidden background processes that track your browsing habits.

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

Move the .dmg file to the Trash and empty it.