![]() ![]() ![]() no ? This is still overwritten on reboot! This a good enough temporary solution, but as we need to disable the “Tamper Protection”, it cannot be scripted in PowerShell. #WINDOWS DEFENDER HOW TO DISABLE WINDOWS#Setting its value to 1 immediately stops Windows Defender: Then, with “Tamper Protection” off, and as SYSTEM, the key HKLM\SOFTWARE\Microsoft\Windows Defender\DisableAntiSpyware finally becomes writable. I finally managed to disable it, by adding a process exclusion (including regedit.exe): the policy is removed! So this seems to be completely ignored. Well, nothing is disabled yet, and after reboot …. This 3rd key is written by MsMpEng.exe which happens to be the binary run by the Microsoft Defender service: this is the Defender userland engine. I also noted that a 3rd key is written when the tamper protection is off: This time is doesn’t raise a security alert, so the second key must be necessary. The previous key is actually written by a service ( svchost.exe -k netsvcs -p -s gpsvc) and another one is written in a policy object. Here is what we get when editing the policy with gpedit : Maybe we need to be more subtle, and use gpedit to edit this policy, let’s try that! GPO But it gets better, it is actually considered a Severe security alert! I created it, Defender was still running, without warning or anything, so it doesn’t seem to have any effect. This second one, we can write, to let’s go for it! It is indeed read when opening the configuration:Ģ Keys are read, one in the “main configuration” key, and one under HKLM\SOFTWARE\Policies. Searching on the internet (like ), there seems to be a registry key for that, named DisableAntiSpyware. Disable Defender: the Microsoft way DisableAntiSpyware ![]() Of course, Microsoft provides ways and documentation to disable Defender, so let’s check them out. What I used to do was using Set-MpPreference to add whole drives as exception, but sometimes I would still get alerts : Defender is still running and analyzing my actions. We can’t edit the configuration directly in the registry, even as SYSTEM.There is not option to disable “Tamper Protection” in powershel (that’s the point ….).Now, one thing to note is that the Administrator (meaning members of the BUILTIN\Administrators group) cannot change those keys (only SYSTEM can):Īn even as SYSTEM, with tamper protection off, writing is still not authorized: The “Tamper Protection” is next, using 2 keys: HKLM\SOFTWARE\Microsoft\Windows Defender\Features\TamperProtection (4 when disabled) and HKLM\SOFTWARE\Microsoft\Windows Defender\Features\TamperProtectionSource (2 when disabled)Īnd lastly, exclusions are stored in subkeys of HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions depending on their type: (For reference, the key for “Automatic sample submission” is HKLM\SOFTWARE\Microsoft\Windows Defender\SpyNet\SubmitSampleConsent) Then the “cloud-delivered protection”, with the key HKLM\SOFTWARE\Microsoft\Windows Defender\SpyNet\SpyNetReporting : Then I proceeded to check the keys for each parameter.įirst on the list is the “Real-Time protection”, modifying the key HKLM\SOFTWARE\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring We get a first idea of the configuration location, most interesting keys seems to be under HKLM\SOFTWARE\Microsoft\Windows Defender. I looked for registry access with “Defender” in the path, and this is the result: Procmon, from SysInternals, is a very convenient tool for this kind of research. TL DR : the final script can be found here : Registry configurationįirst, I took some time to look at the registry configuration, where are the parameters located, and how/when the values were changed. I would also add that some alternative working solutions have been added in the comments of this article (many thanks to their writers !) : it’s definitly worth checking. The “general public” might find another, easier to use solution that suit their need better. I made it as a malware analyst, for my usage, and decided to share it to help others. It aims at disabeling permanently windows defender, even removing its files if you chose to. This script is not intended as a “stop/start” solution. #WINDOWS DEFENDER HOW TO DISABLE WINDOWS 10#It finally bothered me enough to take an actual look at how to disable it permanently and reliably, in a fully automated way (a PowerShell script), on my Windows 10 20H2 (build 19042). Once again, after a Windows update, Windows Defender activated itself again. ![]()
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