How do I get rid of the Safari malware that demands that I update my flash?

Force Quit Safari ( command + option + esc keys).Then restart Safari holding the Shift key. If you still have problems Empty Caches (Safari menu > Preferences > Privacy > Remove all website data. (This will also remove history if you do not want to remove History open Safari Preferences > Advanced and check mark “Show Develop Menu” then choose “Empty Caches” from Develop Menu ) If the problem persists download and run MalwareBytes. Malwarebytes was developed by one of our own colleagues here in ASC. It gets rave reviews and is about the most proven anti-malware software for Mac.

You're welcome. Let us know if there are further problems.

Only update Flash Player either through System Preferences > Flash Player > Check for updates, or from Adobe's Official Website. There are a lot of scams out there involving Flash Player, which will download bogus installers that will install malware.

Further there are very few sites that still use Flash, so if you don't need it, you may want to uninstall it entirely.

That's not a malicious app or PUP, that's a pop-up. Follow the directions in my first post.

https://blog.malwarebytes.com/puppum/2016/08/pup-friday-mackeeper/