Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??

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  1. Posts : 25,641
    Windows 11 Pro 22621.1
       #11

    I went back to 1903 and tried it, Defender is messed up in the last update. I got an 18 second scan then nothing....
      My Computer


  2. Posts : 934
    Win10 Version 21H2 19044.1645
       #12

    Joined to find a solution.

    Full scan worked 1 time after System Restore, but returned to incomplete scan. sfc/scannow normal. Article from ZDNet.


    There's currently a major bug in Windows Defender, the free antivirus software that ships with Windows 10.

    Running a Quick or Full scan will fail after a few seconds and only go through a handful of files, resulting in incomplete,
    superficial results. Such scans are usually known to take tens of minutes, and even hours.

    The issue has been widely reported over the past two days on the Microsoft tech support forums [1, 2, 3, 4, 5], Reddit [1, 2, 3, 4], and tech support sites like AskWoody, DeskModder, BornCity, and Bleeping Computer.

    The bug impacts Windows Defender version 4.18.1908.7 and later, released earlier this week. The bug was introduced while Microsoft tried to fix another bug introduced with the July 2019 Patch Tuesday.

    Per reports, the original bug broke "sfc /scannow," a command part of the Windows System File Checker utility that lets Windows users scan and fix corrupted files.

    After the July Patch Tuesday this utility started flagging some of Windows Defender's internal modules as corrupted, resulting in incorrect error messages that fooled admins into believing there was something wrong with their Windows Defender installation, and its updates.

    Microsoft announced a fix for the System File Checker bug in August, but the actual patch was delayed. When the fix arrived earlier this week, it didn't yield the expected results.

    Furthermore, the issue doesn't appear to impact Windows Defender on Windows 10, but also all other Windows versions where Windows Defender ships. The same bug has also been reported with Security Essentials, Windows Defender's precursor on older Windows versions.

    A Microsoft spokesperson has not returned a request for comment before this article's publication seeking additional comments.

    Fortunately, there's a way around this bug, if users need to perform daily scans of sensitive systems. Instead of relying on a Quick or Full scan, users can use the Windows Defender "Custom scan" feature and select the drives of folders they'd like scanned, manually, one by one.
    windows-defender-custom-scan-error.png

    Windows Defender malware scans are failing after a few seconds | ZDNet
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  3. Posts : 61,554
    64-bit Windows 11 Pro for Workstations
       #13
      My Computers


  4. Posts : 25,641
    Windows 11 Pro 22621.1
       #14

    I do not even have that version in your link. I am still on the old one even in 20H1.
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  5. Posts : 24,602
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #15

    The bug has been fixed with the release of definitions 1.301.1684.0
    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-image.png

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-image.png

    And fixed for MSE in Windows 7 too.

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-mse-updated-definitions.png

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-mse-updated-scan.png
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  6. Posts : 12
    Windows 10 Home x64
       #16

    1684 works for me also. Thanks

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-wdqs.jpg
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  7. Posts : 913
    Win 10
       #17

    Same here.
      My Computers


  8. Posts : 24,602
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #18

    Microsoft has now confirmed it was all the fault of the definitions....


    Update 9/18/19 7:28 PM: Microsoft has told BleepingComputer that the issue has now been resolved. It turns out it was an issue in the definitions and has been resolved in "Security Intelligence Update for Windows Defender Antivirus - KB2267602 (Version 1.301.1684.0)".
    Windows Defender Antivirus Scans Broken After New Update
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