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Q: What are .isdata files? Is this malware?

I recently found a sudoers file on my 2015 Macbook Air, 13" (1.6GHz Intel Core 5/Mem 4GB 1600MHz DDR3)El Capitan 10.11.6  which took control of my HD as well as my cable modem. I was able to correct those problems, (with help from this forum, THANKS!) but I still cannot change permissions for my Apps Folder, and cannot sign in to the App Store. I want to revert to the original OS X Yosemite. I set up a root user acct., and am using a clean Firefox install. When I tried to connect to apple.com I got a re-direct warning (Chrome) which I don't have installed. I then opened Finder and went to Library/Caches/com.apple.iconservices.store and found about a hundred or more of these text document files, all written in code, with the extension   .isdata    I am not so concerned about a bricked machine, since I have a damage warranty from the retailer, and they say I can exchange it. I just don't want to start deleting files that may be necessary for the system. Has anyone seen these files? Can they be safely deleted? (I am running is safe boot under root user)

MacBook Air (13-inch, Early 2015), OS X El Capitan (10.11.6)

Posted on Sep 19, 2016 10:40 AM

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Q: What are .isdata files? Is this malware?

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