This article is contributed. See the original author and article here.

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Dear IT Pros,


Ransomware acts with accessing to the files, folders and encrypting  them, to respond against it, we need to enable the Windows Defender feature named “Controlled Folder Access” – WDCFA and monitor the Windows Defender Guard Events in Windows Event Viewer. The best way is possibly collecting the related activities by Advanced Hunting features of Microsoft 365 Security or Defender for Endpoint.


Could we search for Event ID by running the advanced hunting query or not?


We will discuss the above topic today.


 


To View or change the list of protected folders


You can use the Windows Security app to view the list of folders that are protected by controlled folder access.



  1. On your Windows 10 device, open the Windows Security app.

  2. Select Virus & threat protection.

  3. Under Ransomware protection, select Manage ransomware protection.

  4. If controlled folder access is turned off, you’ll need to turn it on. Select protected folders.

  5. Do one of the following steps:

    • To add a folder, select + Add a protected folder.

    • To remove a folder, select it, and then select Remove.




 Note


Windows system folders are protected by default, and you cannot remove them from the list.


 


Review controlled folder access events in Windows Event Viewer


The following table shows events related to controlled folder access:
























Event ID



Description



5007



Event when settings are changed



1124



Audited controlled folder access event



1123



Blocked controlled folder access event



You can review the Windows event log and look for events which were created when controlled folder access of Windows Defender had blocked (or reported in audit mode) an app ‘s activity of accessing to the related folders, steps to follow:



  1. Download the Evaluation Package and extract the file cfa-events.xml to an easily accessible location on the device.


 Content of cfa-events.xml is shown in the following lines:


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  1. Type Event viewer in the Start menu to open the Windows Event Viewer.

  2. On the left panel, under Actions, select Import custom view….

  3. Navigate to where you extracted cfa-events.xml and select it. Alternatively, copy the XML directly.

  4. Select OK.


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Review controlled folder access events in the Microsoft 365 Security.


M365 Security portal, advanced hunting provides detailed information of Windows Defender events as part of its alert investigation scenarios.


You can query Microsoft 365 Security data by using Advanced hunting. For Controlled Folder Access, if you are enable it audit mode, you can use advanced hunting to see how controlled folder access settings would affect your environment if they were enabled.


To query Controlled Folder Access Events by Powershell, :


 


 


 


 

DeviceEvents
| where ActionType in ('ControlledFolderAccessViolationAudited','ControlledFolderAccessViolationBlocked')

 


 


 


Advanced Hunting for Controlled Folder Access Events:


 


Query Table


   


























WDAC- Windows Defender Application Control



DeviceEvents


| where Timestamp > ago(7d) and ActionType startswith “AppControl”


| summarize Machines=dcount(DeviceName) by ActionType


| order by Machines desc



Monthly report on Vulnerability



DeviceTvmSoftwareInventoryVulnerabilities 


| project  DeviceName, SoftwareName, CveId, SoftwareVersion, VulnerabilitySeverityLevel


| join (DeviceTvmSoftwareVulnerabilitiesKB


| project AffectedSoftware, VulnerabilityDescription , CveId , CvssScore , IsExploitAvailable


           )


                on CveId


| project CveId , SoftwareName , SoftwareVersion , VulnerabilityDescription , VulnerabilitySeverityLevel, IsExploitAvailable , CvssScore


| distinct SoftwareName , SoftwareVersion, CveId, VulnerabilityDescription , VulnerabilitySeverityLevel, IsExploitAvailable 


| sort by SoftwareName asc , SoftwareVersion



WD-ASR Event



DeviceEvents


| where ActionType == “AsrOfficeChildProcessAudited” and Timestamp > minTime


| project BlockedProcess=FileName, ParentProcess=InitiatingProcessFileName, DeviceName, Timestamp



WD-CFA Controlled Folder Access Event



DeviceEvents


| where ActionType in (‘ControlledFolderAccessViolationAudited’,’ControlledFolderAccessViolationBlocked’)



 



 




  • We could not query by Event ID.


Until today, the built-in Defender for Endpoint sensor does not allow raw ETW access using Advanced Hunting nor forwards them.



  • In Event Viewer, using XML to filter events related to Windows 10 Defender Guard,


the Event IDs are listed in the following Event Table:


 














































































































































































































Feature



Provider/source



Event ID



Description



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



1



ACG audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



2



ACG enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



3



Do not allow child processes audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



4



Do not allow child processes block



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



5



Block low integrity images audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



6



Block low integrity images block



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



7



Block remote images audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



8



Block remote images block



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



9



Disable win32k system calls audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



10



Disable win32k system calls block



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



11



Code integrity guard audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



12



Code integrity guard block



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



13



EAF audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



14



EAF enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



15



EAF+ audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



16



EAF+ enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



17



IAF audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



18



IAF enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



19



ROP StackPivot audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



20



ROP StackPivot enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



21



ROP CallerCheck audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



22



ROP CallerCheck enforce



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



23



ROP SimExec audit



Exploit protection



Security-Mitigations (Kernel Mode/User Mode)



24



ROP SimExec enforce



Exploit protection



WER-Diagnostics



5



CFG Block



Exploit protection



Win32K (Operational)



260



Untrusted Font



Network protection



Windows Defender (Operational)



5007



Event when settings are changed



Network protection



Windows Defender (Operational)



1125



Event when Network protection fires in Audit-mode



Network protection



Windows Defender (Operational)



1126



Event when Network protection fires in Block-mode



Attack surface reduction



Windows Defender (Operational)



5007



Event when settings are changed



Attack surface reduction



Windows Defender (Operational)



1122



Event when rule fires in Audit-mode



Attack surface reduction



Windows Defender (Operational)



1121



Event when rule fires in Block-mode




  • You could run the queries by using Microsoft 365 Security or Microsoft Defender for Endpoint.


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I hope the information is useful, see you next time.


Reference:


Brought to you by Dr. Ware, Microsoft Office 365 Silver Partner, Charleston SC.

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