sudo /usr/local/McAfee/AntiMalware/VSControl stopoas
sudo defaults write /Library/Preferences/com.mcafee.ssm.antimalware.plist OAS_Enable -bool False
sudo /usr/local/McAfee/AntiMalware/VSControl stop
sudo /usr/local/McAfee/AntiMalware/VSControl reload
Or completely uninstall:
sudo /Library/McAfee/cma/scripts/uninstall.sh