[Swordmaker]

Hey, Cap'n, here's how you turn it back on if it's off.

Open a terminal window. You'll find Terminal inside Utilities in Applications then cut and paste this into the Terminal at the prompt and then press Return or Enter:

defaults write com.apple.LaunchServices LSQuarantine -bool YES

That will turn xProtect back on if it has been turned off.

If for some reason you WANT to turn it off, put the same command in the Terminal and change the "YES" to "NO" and press Return or Enter.

[House Atreides]

VERY useful post Swordmaker. I have no idea if I’ve ever managed to unknowingly turn off xProtect but, just to be safe, I followed your instruction on how to set it to on.

[Captainpaintball]

Thanks. It may have been off.

BTW, my terminal still says “Bash” on it. I never recognized that until that virus went around. Should it still say “BASH”?