Windows Event ID 4693 – Microsoft-Windows-Security-Auditing: Attempt to Access Protected System Object

Start by examining the specific details of Event ID 4693 to understand the access attempt context.

1. Open Event Viewer by pressing Win + R, typing eventvwr.msc, and pressing Enter
2. Navigate to Windows Logs → Security
3. Filter for Event ID 4693 by right-clicking the Security log and selecting Filter Current Log
4. Enter 4693 in the Event IDs field and click OK
5. Double-click on a 4693 event to view details. Key fields to examine:
   • Subject: Shows the account making the access attempt
   • Object: Displays the protected object being accessed
   • Process Information: Reveals the executable making the request
   • Access Request Information: Shows the specific permissions requested
6. Note the timestamp, process name, and object path for correlation with other security events

Leverage PowerShell to perform detailed analysis and correlation of Event ID 4693 occurrences.

1. Open PowerShell as Administrator
2. Query recent 4693 events with detailed information:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4693} -MaxEvents 50 | Select-Object TimeCreated, Id, LevelDisplayName, Message | Format-Table -Wrap

3. Filter events by specific process names to identify patterns:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4693} | Where-Object {$_.Message -like "*suspicious_process.exe*"} | Select-Object TimeCreated, Message

4. Analyze events by user account to detect unusual access patterns:

   $Events = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4693} -MaxEvents 100
   $Events | ForEach-Object {
       $Event = [xml]$_.ToXml()
       $Subject = $Event.Event.EventData.Data | Where-Object {$_.Name -eq 'SubjectUserName'} | Select-Object -ExpandProperty '#text'
       [PSCustomObject]@{
           Time = $_.TimeCreated
           User = $Subject
           ProcessName = ($Event.Event.EventData.Data | Where-Object {$_.Name -eq 'ProcessName'} | Select-Object -ExpandProperty '#text')
           ObjectName = ($Event.Event.EventData.Data | Where-Object {$_.Name -eq 'ObjectName'} | Select-Object -ExpandProperty '#text')
       }
   } | Group-Object User | Sort-Object Count -Descending

5. Export findings for further analysis:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4693} -MaxEvents 200 | Export-Csv -Path "C:\Temp\Event4693_Analysis.csv" -NoTypeInformation

Optimize audit policy settings to ensure comprehensive logging of protected object access attempts.

1. Open Local Group Policy Editor by running gpedit.msc (or use Group Policy Management for domain environments)
2. Navigate to Computer Configuration → Windows Settings → Security Settings → Advanced Audit Policy Configuration → Audit Policies
3. Expand Object Access and configure the following policies:
   • Audit Kernel Object: Set to Success and Failure
   • Audit Other Object Access Events: Set to Success and Failure
   • Audit Registry: Set to Success and Failure for comprehensive registry monitoring
4. Apply the policy using PowerShell for immediate effect:

   auditpol /set /subcategory:"Kernel Object" /success:enable /failure:enable
   auditpol /set /subcategory:"Other Object Access Events" /success:enable /failure:enable
   auditpol /set /subcategory:"Registry" /success:enable /failure:enable

5. Verify current audit policy settings:

   auditpol /get /category:"Object Access"

6. For domain environments, update the Default Domain Controllers Policy to ensure consistent logging across all domain controllers

Perform deep analysis to understand the relationship between processes and protected objects being accessed.

1. Use Process Monitor (ProcMon) to correlate real-time activity with Event 4693 occurrences:
   • Download ProcMon from Microsoft Sysinternals
   • Run ProcMon with administrative privileges
   • Set filters to monitor the specific processes identified in Event 4693
2. Examine the protected objects being accessed using PowerShell:

   # Get object security information
   $ObjectPath = "HKLM\SECURITY"  # Replace with actual object path from event
   Get-Acl -Path "Registry::$ObjectPath" | Format-List
   
   # Check object ownership and permissions
   (Get-Acl -Path "Registry::$ObjectPath").Owner
   (Get-Acl -Path "Registry::$ObjectPath").Access | Format-Table IdentityReference, AccessControlType, RegistryRights -AutoSize

3. Analyze process integrity levels and privileges:

   # Check running processes and their integrity levels
   Get-Process | Where-Object {$_.ProcessName -eq "ProcessNameFromEvent"} | ForEach-Object {
       $Process = $_
       $Handle = [System.Diagnostics.Process]::GetProcessById($Process.Id)
       Write-Host "Process: $($Process.ProcessName) - PID: $($Process.Id)"
   }

4. Review system file integrity if system files are being accessed:

   sfc /verifyonly

5. Check for recent system changes that might explain new access patterns:

   # Review recent software installations
   Get-WinEvent -FilterHashtable @{LogName='Application'; Id=1033,1034} -MaxEvents 20 | Select-Object TimeCreated, Id, LevelDisplayName, Message

Deploy comprehensive monitoring solutions for ongoing Event 4693 analysis and automated response capabilities.

1. Configure Windows Event Forwarding (WEF) for centralized log collection:

   # On the collector server, configure the subscription
   wecutil cs subscription.xml
   
   # Create subscription XML file with Event 4693 filter
   $SubscriptionXML = @"
   <Subscription xmlns="http://schemas.microsoft.com/2006/03/windows/events/subscription">
       <SubscriptionId>Event4693Collection</SubscriptionId>
       <SubscriptionType>SourceInitiated</SubscriptionType>
       <Description>Collect Event ID 4693 from all domain systems</Description>
       <Enabled>true</Enabled>
       <Uri>http://schemas.microsoft.com/wbem/wsman/1/windows/EventLog</Uri>
       <ConfigurationMode>Normal</ConfigurationMode>
       <Query><![CDATA[
           <QueryList>
               <Query Id="0">
                   <Select Path="Security">*[System[EventID=4693]]</Select>
               </Query>
           </QueryList>
       ]]></Query>
   </Subscription>
   "@
   $SubscriptionXML | Out-File -FilePath "C:\Temp\Event4693Subscription.xml" -Encoding UTF8

2. Set up automated alerting using PowerShell and Task Scheduler:

   # Create a scheduled task to monitor for suspicious 4693 events
   $Action = New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-File C:\Scripts\Monitor4693.ps1"
   $Trigger = New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 5)
   $Settings = New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -DontStopIfGoingOnBatteries
   Register-ScheduledTask -TaskName "Monitor Event 4693" -Action $Action -Trigger $Trigger -Settings $Settings -User "SYSTEM"

3. Integrate with Microsoft Sentinel or third-party SIEM solutions for advanced analytics
4. Create custom detection rules based on baseline behavior patterns
5. Implement automated response workflows for high-risk access attempts
6. Configure log retention policies to maintain historical data for forensic analysis:

   # Set Security log size and retention
   Limit-EventLog -LogName Security -MaximumSize 512MB -OverflowAction OverwriteAsNeeded