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amueller-tf's avatar
amueller-tf
Brass Contributor
Jul 26, 2021

Defender AV - Active/Passive Mode - Advanced Hunting

While researching how to verify if Defender AV is in active or passive mode I found an Advanced Hunting query that searches "DeviceTvmSecureConfigurationAssessment" and then filters "ConfigurationId...
Advanced hunting
Defender AV
peter_george's avatar
peter_george
Icon for Microsoft rankMicrosoft
Can you please share the query
amueller-tf's avatar
amueller-tf
Brass Contributor
Oct 26, 2021

peter_georgeCertainly. I found the script at https://www.reddit.com/r/DefenderATP/comments/lfd5zy/comment/gmynulv/?utm_source=share&utm_medium=web2x&context=3. Here it is:

 

let avmodetable = DeviceTvmSecureConfigurationAssessment
| where ConfigurationId == "scid-2010" and isnotnull(Context)
| extend avdata=parsejson(Context)
| extend AVMode = iif(tostring(avdata[0][0]) == '0', 'Active' , iif(tostring(avdata[0][0]) == '1', 'Passive' ,iif(tostring(avdata[0][0]) == '4', 'EDR Blocked' ,'Unknown')))
| project DeviceId, AVMode;
DeviceTvmSecureConfigurationAssessment
| where ConfigurationId == "scid-2011" and isnotnull(Context)
| extend avdata=parsejson(Context)
| extend AVSigVersion = tostring(avdata[0][0])
| extend AVEngineVersion = tostring(avdata[0][1])
| extend AVSigLastUpdateTime = tostring(avdata[0][2])
| project DeviceId, DeviceName, OSPlatform, AVSigVersion, AVEngineVersion, AVSigLastUpdateTime, IsCompliant, IsApplicable
| join avmodetable on DeviceId
| project-away DeviceId1

 

  • Jonhed's avatar
    Jonhed
    Steel Contributor
    Oct 26, 2021

    I noticed the server that shows unknown is running Windows Server 2012 R2
    The query looks for Microsoft Defender AV data, which is not integrated in 2012 R2,
    so I am going to assume this query is not able to get the info in question on Windows 2012 R2 machines since Defender does not exist.
    (The link on reddit also does not mention any other platform than Windows 10 and Server 2019)

    • amueller-tf's avatar
      amueller-tf
      Brass Contributor
      Oct 27, 2021

      Jonhed 

       

      I just ran this script in a production environment and there are around 500 Windows 10 devices with AVMode "Unknown" which I assume means that Defender AV is completely disabled.

       

       

      And this is a screenshot of when I run the script in my demo environment (with the "new" MDE agent installed on it ... https://techcommunity.microsoft.com/t5/microsoft-defender-for-endpoint/defending-windows-server-2012-r2-and-2016/ba-p/2783292). Defender AV AVMode shows up as "Active" on Windows Server 2012 R2.

       

      • Jonhed's avatar
        Jonhed
        Steel Contributor
        Oct 29, 2021

        amueller-tf 

        Judging by the new screenshots, I agree that it looks like the unknown status means that AV is completely disabled (service not running or is not installed).

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