Is there a free application to detect the virus and Trojans on my iMac?

I think I have an evil entity of some sort on my computer.  It is not malware.  Is there a free app to download to search for viruses and Trojan horses to an iMac, OSX 10.9.5?

Thanks for the recommendations.

You don't need anti-virus software and must not install, free or not. They are unnecessary and a waste of your money. If you have advertising software problems:

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Tags: Mac OS & System Software

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