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I have Macbook Air 2017 running Mojave 10.14.4, so I check every month to find out there is a virus or malware on my Mac, usually I only use CleanMyMacX and Malwarebytes so one day before I check my Macbook my friend says try doing first aid and when I check using the help first aidenter image description here disk utility appears like this

disk utility asks me to do first aid through recovery mode, I do it or not

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Better to run sooner than later. Disk Utility is written by Apple. Why are you worried. You should have a full backup of your system.

See this article. Pick diskutilty. Run disk first aid. https://support.apple.com/en-us/HT201314

I read were many people do not recommend running CleanMyMacX. Could be why you are experiencing problems with your machine. I recommend you stop running CleanMyMacX. Read manufacture's site on how to uninstall. See: https://macpaw.com/support/cleanmymac-3/knowledgebase/how-to-uninstall-cleanmymac-3

Simple put, Apple attempts to provide all the malware detection and removal you need in Mac OS X.

"Effective defenses against malware and other threats" by John Galt https://discussions.apple.com/docs/DOC-8841

"Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams" https://support.apple.com/en-ca/HT204759

"MalwareBytes Anti-Malware for Mac Removes adware and malware Revives your Mac." MalwareBytes has a more restrictive filter for adware than Apple. MalwareBytes has come to be accepted as the only malware detector you should consider. For those pestered by browser attacks consider MalwareBytes. https://www.malwarebytes.org/antimalware/mac/

etrecheck Run etrecheck. The first five runs are free. Provided a report on your machines hardware and software. Great for diagnosing your system. Click on the download link at the bottom of the screen. http://etrecheck.com/

Apple on Security: https://www.apple.com/business/resources/docs/macOS_Security_Overview.pdf

phishing "fake" panic warnings https://discussions.apple.com/docs/DOC-8771 https://support.apple.com/en-ca/HT204759

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