What software can I use to remove malware?

Fixes for Adware and Pop-ups

1. Malwarebytes
2. DetectX Swift
3. Remove adware that displays pop-up ads and graphics on your Mac
4. Stop pop-up ads and adware in Safari - Apple Support

MalwareBytes for Mac was written by a long time forum contributor (originally AdwareMedic). So far it has remainded the best tool for removing adware from a Mac, and since adware is the primary thing annoying Mac users it is much more effective than the other malware packages, which spend all their time looking for Windows threats that will not affect the Mac.

You might also look at something like https://www.ublock.org/ extension for your web browser.

If Malwarebytes doesn't fix the problem, try running this program in your normal user account, then copy and paste the output in a reply. The program was created by etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy Report” and then paste into a reply. This will show what is running on your computer. No personal information is shown. You can run the report for free at least once, but if you run it several times, at some point it will ask you to pay a license fee.

Etrecheck – System Information