How to Turn On or Off Microsoft Defender Antivirus in Windows 10  

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  1. atinfo's Avatar
    Posts : 139
    Windows 10 20H2 Enterprise (x64)
       #310

    Brink said:
    The new icon should be available starting with Windows 10 build 19577.
    Thanks

    21H2 (!?) Every good thing is gathered to be revealed in 21H2 .

    What would be the next one?! (I hope it does not like Win 10X , and breaks the shaft in the middle of route! )
      My Computer


  2. Posts : 2
    Debian
       #311

    I was struggling with disabling defender so for the prosperity I will write my findings and solution.

    The goal was to disable Defender using group policy (gpedit) so no third party software (with do works) and this was on Windows 20H2.
    There is a bug in, apparently, gpedit (or somewhere else) that prevent gpedit settings to stick:

    Win 20H2 build 19042.964 - when using gpedit to disable Defender after applying settings or restarting PC settings will revert back to "Not configured" in gpedit and Defender will still works. To work this around do fallowing:

    - disable via gpedit, click OK
    - restart PC

    repeat this until Windows Defender no longer auto start (in my case I had to do this 3-4 times).
    Credit: Cannot disable Microsoft Defender Antivirus via group policy on 20H2 : Windows10TechSupport

    Windows 20H2 build 19042.985 - works fine, no trickery needed, gpedit disables Windows Defender (this update was offered, to me at least, today while struggle with version 19042.964 encountered yesterday).
      My Computer

  3. TairikuOkami's Avatar
    Posts : 4,871
    Windows Home Dev 21xxx x64
       #312

    Good luck disabling Defender on 21H2, it becomes mission impossible.
      My Computer

  4. Paul Black's Avatar
    Posts : 13,070
    Win 10 Pro 64-bit v1909 - Build 18363 Custom ISO Install
       #313

    TairikuOkami said:
    Good luck disabling Defender on 21H2, it becomes mission impossible.

    I agree.

    I must admit that Windows Defender [ Security Essentials ] was very poor in my opinion a few years ago, but now, it does the job extremely well!

    I used to use third-party AV, but in my opinion, there is NO need now.
      My Computer


  5. Posts : 50
    Windows 10
       #314

    Whenever Defender thinks (in a copy or move operation) a file is evil it deletes it silently.

    This is an absolute no-go.

    Defender should at least prompt the user.

    Moreover the necessary tricks to disable it is annoying

    Defender sucks.
      My Computer

  6. Chrysalis's Avatar
    Posts : 210
    Win 10 1809 LTSC
       #315

    tobwen said:
    Whenever Defender thinks (in a copy or move operation) a file is evil it deletes it silently.

    This is an absolute no-go.

    Defender should at least prompt the user.

    Moreover the necessary tricks to disable it is annoying

    Defender sucks.
    I might post my own mini tutorial somewhere later, but there is still a lot of control over defender, and fully disabling it I have discovered is kind of like using a sledgehammer to kill a fly.

    e.g. you can toggle a real time flag in group policy, that is effectively the same as disabling it in terms of performance and its inteventions on the OS, you can also disable it in the security applet, and add a task that auto disables it whenever it turns itself back on (I posted here the task).

    In addition you can disable individual parts of defender such as the behaviour analysis, the real time file monitoring (this one probably stops your deleted files) as well as the network intervention. None of this stuff is affected by the tamper protection.

    You can go to the security applet, and reverse previous actions, usually defender will move a file to quarantine rather then full on delete it, given the amount of operator errors that occur on security prompts I have personally come round to microsoft's way of thinking.

    There is also control provided for process exclusions, folder exclusions etc. So the reality is defender offers close to level of control you get in 3rd party solutions, the difference been this control is not so visible to access, alot of it is in group policies.
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  7. Posts : 50
    Windows 10
       #316

    @Chrysalis:

    You wrote: Everything is configurable for Defender.

    So ok: How do I tell Defender to NEVER EVER delete a file (during MOVE or COPY even from/to network folder) even if you thinks its evil?
      My Computer


  8. Posts : 20
    W10
       #317

    tobwen said:
    @Chrysalis:

    You wrote: Everything is configurable for Defender.

    So ok: How do I tell Defender to NEVER EVER delete a file (during MOVE or COPY even from/to network folder) even if you thinks its evil?
    I don't think you can configure such a thing. This is why I tried for a moment NOD32 and turned back to Microsoft Antivirus. Basically you have to wait to put a file into quarantine and then go to Settings and choose "Allow on device". I don't think there's any way to just warn you and don't delete. Somebody please shed some light on the matter.
      My Computer

  9. Brink's Avatar
    Posts : 57,946
    64-bit Windows 10 Pro for Workstations build 21390
    Thread Starter
       #318

    tobwen said:
    @Chrysalis:

    You wrote: Everything is configurable for Defender.

    So ok: How do I tell Defender to NEVER EVER delete a file (during MOVE or COPY even from/to network folder) even if you thinks its evil?
    fortree said:
    I don't think you can configure such a thing. This is why I tried for a moment NOD32 and turned back to Microsoft Antivirus. Basically you have to wait to put a file into quarantine and then go to Settings and choose "Allow on device". I don't think there's any way to just warn you and don't delete. Somebody please shed some light on the matter.
    You could add exclusions to Microsoft Defender if wanted.

    Add or Remove Microsoft Defender Antivirus Exclusions in Windows 10
      My Computers


  10. Posts : 50
    Windows 10
       #319

    Brink said:
    You could add exclusions to Microsoft Defender if wanted.

    Add or Remove Microsoft Defender Antivirus Exclusions in Windows 10
    Ok, But as far as I can see specifying an exclusion for e.g. whole partition D:\ mean that none of the files are scanned.
    Thats bad.

    I want to let Defender scan each file excatly ONCE. If Defender thinks its evil a popup should appear asking me for action.
    This popup dialog should contain a button similar to "exclude (only) this file from further scan".
    AND - as already said - the file should NOT be deleted if user click on exclude.

    So is there something like an exclude on first detection?
      My Computer


 
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