Viruses from DMG files?

Discussion in 'Mac Basics and Help' started by Ev0d3vil, Dec 3, 2016.

  1. Ev0d3vil macrumors 6502

    Joined:
    Sep 22, 2014
    #1
    Hi guys, my gatekeeper setting is set to default. Is it possible to get viruses from DMG files ? and how do i scan them for viruses or spyware?
     
  2. Gregg2 macrumors 603

    Joined:
    May 22, 2008
    Location:
    Milwaukee, WI
    #2
    No known virus affects Mac OS X.
    Spyware, maybe - from a dmg file? Don't know. A brief search told me it's not likely.
     
  3. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #3
    DMG files are disk images; they are containers, like ZIP files. Think of them as virtual CDs. They are not themselves dangerous, at least I don’t think that the process of opening them executes any code. Potentially dangerous is what they carry, namely programs. Gatekeeper checks if programs are code-signed by the developer, but this check will only be performed automatically when you obtained the disk image via a browser or like. If you want some extra security, then you should download a malware scanner.

    For macOS Sierra, developers can code-sign the disk image as well and vouch for all the contents. This gives you some extra certainty, provided that you download the disk image from a trusted source and make sure that it is signed by the person or organisation you downloaded it from.

    For malware in general, you should have a look at this guide: http://www.thesafemac.com/mmg/
     

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