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

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  1. Posts : 14
    Windows 10 Pro 64Bit
       #1

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


    Hi,

    Got a weird issue with Windows 10 Defender Antivirus:
    Windows 10 Defender scans for less than 15 seconds and then finishes?
    Does not matter if quick scan or full scan...total of about 15 files scanned for each...

    Any ideas?
    Thanks!

    Jesse
      My Computer


  2. Posts : 118
    Windows 10 Pro
       #2

    It's not just you. I had a quick scan run this morning at 9.30am, at that time on virus definition version 1.301.1600.0. It lasted several mins & scanned thousands of files as usual. Then I saw a thread on another forum about this so I updated WD and ran a quick scan and it lasted 13 secs and scanned just 50 files, same when a full scan runs. It's now up to version 1.301.1622.0 and the problem still persists. It would seem a WD virus definition update after 1.301.1600.0 is the cause. Hopefully MS find what they broke and fix it soon.

    Quick Scan on definition version 1.301.1600.0 earlier today:

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-quick-scan-earlier.png

    Quick scan after updating this evening to Quick Scan on definition version 1.301.1608.0:

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-quick-scan-just-now.png
      My Computers


  3. Posts : 24,556
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #3

    I was looking at this on another thread, and before updating the definitions I saw this....

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

    ...and after updating got this:

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

    But this is the really worrying one, there's no way just 90 files can be a Full scan:

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

    Only a Custom scan seems to do what it says on the tin.

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


  4. Posts : 56,050
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider
       #4

    Only had the one def update this morning, so far. Wow! Scan barely started before it finished. Defs were received when I first turned the machine this morning, at 5:14am, ET. A scheduled scan occurred immediately after.

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_08h05_10.png

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_08h02_00.png

    Just ran a manual Quick scan and took 9 seconds and 18 files.

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_07h54_09.pngWindows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_07h53_16.png

    Just ran a FULL scan, same defs. First time for a FULL in a long while. Either this is very, very efficient, or something is amiss.

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_08h25_02.png
    Last edited by f14tomcat; 18 Sep 2019 at 07:27.
      My Computers


  5. Posts : 801
    Windows 10 Enterprise x64 19044.1737
       #5

    1 Second.
    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-screenshot-180919010-.png
      My Computer


  6. Posts : 12
    Windows
       #6

    For me, the scan lasted 15 seconds, 8 files scanned.
      My Computer


  7. Posts : 1,902
    Windows 10 Pro x64
       #7

    " For me, the scan lasted 15 seconds, 8 files scanned."...................took me 9 seconds , this aint normal (!) , guess its another bug ...!?
      My Computer


  8. Posts : 24,556
    10 Home x64 (21H2) (10 Pro on 2nd pc)
       #8

    The bug is entirely the fault of the virus definitions.

    It has nothing to do with the version of Defender, or even Windows 10 come to that. Exactly the same problem is seen in Windows 7 with Microsoft Security Essentials.

    After updating the virus definitions to 1.301.1645.0 (MSE and Defender use the same definition files) you can see here that a Quick scan has scanned just 44 files!

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-w7-mse-scan-new-.png
    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-w7-mse-definitiions-new-.png

    Here's the same 'before and after' Quick Scan test on a different W7/MSE machine.

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

    A subsequent Full Scan on this machine also only checked 50 items.
    Last edited by Bree; 18 Sep 2019 at 10:26.
      My Computers


  9. Posts : 56,050
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider
       #9

    I got the same ultra-quick scan with both definitions received today. Just check and nothing new than .1645.

    Windows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_12h52_57.pngWindows 10 Defender - Quick/Full Scans Last Only 15 Seconds??-2019-09-18_12h55_05.png
      My Computers


  10. HRC
    Posts : 72
    Windows 10 Home 2004
       #10

    I just did a quick scan and it scanned 5 files in 6 seconds and was finished.
      My Computers


 

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