Windows 10 Defender scanning downloaded files

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  1. mck
    Posts : 133
    Windows 10 Home
       #1

    Windows 10 Defender scanning downloaded files


    Running Win10 Home 64bit on a MSI Z270-A PRO motherboard, i7-6700, 16 GB ram.
    This is a new build for me and I just installed Win10 Home and did all updates.

    When I download programs with Defender running, do I have to manually scan the file before installing the program?

    When I tried to manually scan a downloaded program using the following method, it doesn't show results of the scan:
    • Rt click the file name.
    • In the pop up menu, click "Scan with Windows Defender"
    • A window pops up showing "Full Scan", "Custom Scan" and "Windows defender offline scan", but no results of the individual file scan.

    Thanks for any ideas.
      My Computer


  2. Posts : 13,933
    Windows 10 Pro X64 21H1 19043.1503
       #2

    When I right click on a file in the Downloads Folder and select Scan with Windows Defender I get this:

    Windows 10 Defender scanning downloaded files-image.png

    Nothing happens until I click on Quick Scan.
      My Computers


  3. Posts : 24,562
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #3

    Ztruker said:
    When I right click on a file in the Downloads Folder and select Scan with Windows Defender I get this:
    .... Nothing happens until I click on Quick Scan.
    Nothing appears to happen because that window waits for the scan to complete before it opens. It's actually telling you the results of the scan once it completed, highlighted here:

    Windows 10 Defender scanning downloaded files-image.png

    The 25 files scanned were those inside the file you scanned, probably an installer or a .zip.
      My Computers


  4. Posts : 13,933
    Windows 10 Pro X64 21H1 19043.1503
       #4

    It was a .xpi file, open_with_internet_explorer-49.0-fx+sm.xpi, an extension for Firefox/Seamonkey which is a compressed, zip like file.

    Thanks Bree.
      My Computers


  5. mck
    Posts : 133
    Windows 10 Home
    Thread Starter
       #5

    Ztruker said:
    When I right click on a file in the Downloads Folder and select Scan with Windows Defender I get this:

    Windows 10 Defender scanning downloaded files-image.png

    Nothing happens until I click on Quick Scan.

    Thanks Ztruker,
    When I rt click a xxxxx.exe file and then click Scan with Windows Defender I get this:
    Windows 10 Defender scanning downloaded files-windefender-scanonefile.jpg
    As far as I can see, there is no result of the scan or whether the scan even happened.

    Thanks,
    mck
      My Computer


  6. Posts : 7,086
    Windows 10 Pro 64 bit
       #6

    When I right click and scan a file, I get the result and the option to run more scans:
    Attachment 212460
      My Computers


  7. mck
    Posts : 133
    Windows 10 Home
    Thread Starter
       #7

    Steve C said:
    When I right click and scan a file, I get the result and the option to run more scans:
    Attachment 212460
    Hi Steve,

    I got a screen like yours one time during my testing but never again over a LOT of follow up testing. I have no clue why. I never get the "Threats found" and "Files scanned" info anymore no matter which file I try to scan.

    I wonder if it's even necessary to scan files that are downloaded. AFAIK, Win10 Defender is supposed to have real-time protection so does it auto scan every file that is downloaded regardless of which browser is used to download? I'm running Firefox by the way.

    My version of Win10 is: Version 1803 (OS Build 17134.407)
    Run "winver" to see this.

    Thanks for contributing,
    mck
      My Computer


  8. Posts : 7,086
    Windows 10 Pro 64 bit
       #8

    mck said:
    Hi Steve,

    I got a screen like yours one time during my testing but never again over a LOT of follow up testing. I have no clue why. I never get the "Threats found" and "Files scanned" info anymore no matter which file I try to scan.

    I wonder if it's even necessary to scan files that are downloaded. AFAIK, Win10 Defender is supposed to have real-time protection so does it auto scan every file that is downloaded regardless of which browser is used to download? I'm running Firefox by the way.

    My version of Win10 is: Version 1803 (OS Build 17134.407)
    Run "winver" to see this.

    Thanks for contributing,
    mck
    I have the same build as you. I think Defender does scan downloaded files but I scan them again anyway before installing to be sure.
      My Computers


  9. Posts : 12,420
    Win10 Version 21H2 Pro and Home, Win11 Pro
       #9

    mck said:
    I wonder if it's even necessary to scan files that are downloaded.
    Yes, always. There is not a foolproof way to guarantee the downloads aren't being interfered with somehow between the source and the destination.
      My Computers


  10. Posts : 430
    Windows 10 Pro
       #10

    I scan downloads with Malwarebytes.
      My Computer


 

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