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    Windows 10 Defender Won't Start After Malware or Ransomware

    IT Discussion
    defender anti-virus windows windows 10 malware ransomware
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    • scottalanmiller
      scottalanmiller last edited by

      If you run into this problem, you can remove to registry key folders and often remedy the situation.

      Go to:

      HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defende
      

      and

      HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Advanced Threat Protection
      

      Right click on each and "Delete". Reboot the machine, it will recreate the keys with default settings normally allowing Windows Defender to run again.

      travisdh1 PhlipElder 2 Replies Last reply Reply Quote 4
      • travisdh1
        travisdh1 @scottalanmiller last edited by

        @scottalanmiller That must've been a real PITA to figure out.

        scottalanmiller 1 Reply Last reply Reply Quote 1
        • scottalanmiller
          scottalanmiller @travisdh1 last edited by

          @travisdh1 said in Windows 10 Defender Won't Start After Malware or Ransomware:

          @scottalanmiller That must've been a real PITA to figure out.

          Just a wee bit.

          1 Reply Last reply Reply Quote 0
          • PhlipElder
            PhlipElder @scottalanmiller last edited by

            @scottalanmiller The aside that once owned the machine should be flattened that's good info. 🙂

            scottalanmiller 1 Reply Last reply Reply Quote 0
            • scottalanmiller
              scottalanmiller @PhlipElder last edited by

              @PhlipElder yeah.

              Dashrender 1 Reply Last reply Reply Quote 0
              • Dashrender
                Dashrender @scottalanmiller last edited by

                @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                @PhlipElder yeah.

                Why are you fixing it instead of rebuilding it?

                scottalanmiller 1 Reply Last reply Reply Quote 0
                • scottalanmiller
                  scottalanmiller @Dashrender last edited by

                  @Dashrender said in Windows 10 Defender Won't Start After Malware or Ransomware:

                  @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                  @PhlipElder yeah.

                  Why are you fixing it instead of rebuilding it?

                  Because we have to.

                  1 Reply Last reply Reply Quote 0
                  • scottalanmiller
                    scottalanmiller last edited by

                    Most of the restart issues appear to be from Sophos, not ransomware.

                    1 Reply Last reply Reply Quote 0
                    • scottalanmiller
                      scottalanmiller last edited by

                      But if you want a long analysis, we did the numbers and because there is no fear of data theft, and only of system down time, the decision to fix, rather than replace, the environment was paid. It's purely a manufacturing situation and the only financial impact is to the ability to manufacture. Rebuilding would have impacted that more.

                      1 Reply Last reply Reply Quote 0
                      • DustinB3403
                        DustinB3403 last edited by

                        I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating. . . lol.

                        Also I highly recommend Cybereason RansomFree

                        scottalanmiller Danp 2 Replies Last reply Reply Quote 0
                        • scottalanmiller
                          scottalanmiller @DustinB3403 last edited by

                          @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                          I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                          No application keeps working once it has been disabled.

                          DustinB3403 1 Reply Last reply Reply Quote 0
                          • DustinB3403
                            DustinB3403 @scottalanmiller last edited by

                            @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                            @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                            I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                            No application keeps working once it has been disabled.

                            Nothing on the computer works if Defender is disabled? I've not seen that before.

                            scottalanmiller 1 Reply Last reply Reply Quote 0
                            • scottalanmiller
                              scottalanmiller @DustinB3403 last edited by

                              @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                              @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                              @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                              I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                              No application keeps working once it has been disabled.

                              Nothing on the computer works if Defender is disabled? I've not seen that before.

                              "Application" is the antecedent. Not "Defender."

                              Dashrender 1 Reply Last reply Reply Quote 0
                              • Dashrender
                                Dashrender @scottalanmiller last edited by

                                @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                                No application keeps working once it has been disabled.

                                Nothing on the computer works if Defender is disabled? I've not seen that before.

                                "Application" is the antecedent. Not "Defender."

                                i.e. the ransomware disabled Defender

                                scottalanmiller 1 Reply Last reply Reply Quote 0
                                • scottalanmiller
                                  scottalanmiller @Dashrender last edited by

                                  @Dashrender said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                  @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                  @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                  @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                  @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                  I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                                  No application keeps working once it has been disabled.

                                  Nothing on the computer works if Defender is disabled? I've not seen that before.

                                  "Application" is the antecedent. Not "Defender."

                                  i.e. the ransomware disabled Defender

                                  Or Sophos did. Hard to tell. We saw the same disablement where there was no infection.

                                  dbeato 1 Reply Last reply Reply Quote 0
                                  • Danp
                                    Danp @DustinB3403 last edited by

                                    @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                    Also I highly recommend Cybereason RansomFree

                                    Product is no longer developed or supported.

                                    RojoLoco 1 Reply Last reply Reply Quote 0
                                    • dbeato
                                      dbeato @scottalanmiller last edited by

                                      @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      @Dashrender said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                      I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                                      No application keeps working once it has been disabled.

                                      Nothing on the computer works if Defender is disabled? I've not seen that before.

                                      "Application" is the antecedent. Not "Defender."

                                      i.e. the ransomware disabled Defender

                                      Or Sophos did. Hard to tell. We saw the same disablement where there was no infection.

                                      What version of Sophos? and did it have Intercept X?

                                      scottalanmiller 1 Reply Last reply Reply Quote 0
                                      • scottalanmiller
                                        scottalanmiller @dbeato last edited by

                                        @dbeato said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @Dashrender said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @scottalanmiller said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                        I would think that Windows 10 Defender should continue working during and after malware or ransomware. Rather than just giving up and not operating.

                                        No application keeps working once it has been disabled.

                                        Nothing on the computer works if Defender is disabled? I've not seen that before.

                                        "Application" is the antecedent. Not "Defender."

                                        i.e. the ransomware disabled Defender

                                        Or Sophos did. Hard to tell. We saw the same disablement where there was no infection.

                                        What version of Sophos? and did it have Intercept X?

                                        Didn't check, but probably older. We were just removing it.

                                        dbeato 1 Reply Last reply Reply Quote 0
                                        • RojoLoco
                                          RojoLoco @Danp last edited by

                                          @Danp said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                          @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                          Also I highly recommend Cybereason RansomFree

                                          Product is no longer developed or supported.

                                          My installs keep getting updates... Got any confirmation of this?

                                          black3dynamite Danp 2 Replies Last reply Reply Quote 0
                                          • black3dynamite
                                            black3dynamite @RojoLoco last edited by

                                            @RojoLoco said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                            @Danp said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                            @DustinB3403 said in Windows 10 Defender Won't Start After Malware or Ransomware:

                                            Also I highly recommend Cybereason RansomFree

                                            Product is no longer developed or supported.

                                            My installs keep getting updates... Got any confirmation of this?

                                            https://www.cybereason.com/hubfs/ransomfree-EOL-message.pdf

                                            1 Reply Last reply Reply Quote 1
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