MacBooster.gen is a detection name for MacBooster, a Mac potentially unwanted program (PUP) promoted as a cleanup or speed-up tool. It often rides along with other installs and then pushes aggressive scans, pop-ups, and paid upgrades. Technical background and indicators are in our MacBooster overview for defenders.
Frequent scan alerts and paywall pop-ups
Claims of hundreds of “issues” that aren’t real risks
New login items and background updaters
Browser changes or extra add-ons you didn’t approve
Bundled with “free” apps and repacked installers
Deceptive ads and fake download buttons
Installers with pre-checked offers
Uninstall MacBooster from Applications and remove related login items.
Delete leftover launch agents, daemons, and profiles you don’t recognize.
Reset browsers to default search and remove unknown extensions.
Run a reputable anti-malware scan for macOS and reboot.
Download apps from official sources only.
During install, choose Custom and uncheck extra offers.
Keep macOS and browsers updated.
Be skeptical of tools that find huge “problems” and demand payment to fix them.