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How to check xlsx files for malicious macros or virus

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app103:
Use a disposable Google account and upload it there, to open in Google Sheets. You can view it there, without any sort of Excel specific macros causing potential problems to your system.  And even if it does cause a problem, it would likely be limited to that specific Google account (not your machine), which would be a throw away account, just for that very reason.

mwb1100:
Apparently even CSV files (!) can be vectors for an exploit: http://georgemauer.net/2017/10/07/csv-injection.html

I find that having a Linux VM to open files I don't trust (Office docs, PDFs, etc) keeps my mind at ease.  VirtualBox is free and will work great for this.  It's not necessarily completely fool proof (I imagine that even OpenOffice could be have some vulnerability), but I figure it would sandbox things well enough.

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