Windows Event ID 4782 – Security: User Account Password Changed

Start by examining the complete event details to understand the context of the password change.

1. Open Event Viewer by pressing Win + R, typing eventvwr.msc, and pressing Enter
2. Navigate to Windows Logs → Security
3. Filter the log by clicking Filter Current Log in the Actions pane
4. Enter 4782 in the Event IDs field and click OK
5. Double-click on an Event ID 4782 entry to view detailed information
6. Review the following key fields:
   • Subject: Who performed the password change
   • Target Account: Which account was modified
   • Process Information: What tool was used
   • Logon ID: Session identifier for correlation
7. Check the timestamp to correlate with other security events
8. Note the Workstation Name if present to identify the source system

Use PowerShell to extract and analyze Event ID 4782 entries for patterns or specific accounts.

1. Open PowerShell as Administrator
2. Query recent password change events:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} -MaxEvents 50 | Select-Object TimeCreated, Id, LevelDisplayName, Message

3. Filter events for a specific target account:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} | Where-Object {$_.Message -like "*TargetUserName*"} | Select-Object TimeCreated, Message

4. Extract detailed information using XML parsing:

   $Events = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} -MaxEvents 20
   foreach ($Event in $Events) {
       $XML = [xml]$Event.ToXml()
       $EventData = $XML.Event.EventData.Data
       Write-Output "Time: $($Event.TimeCreated)"
       Write-Output "Subject: $($EventData | Where-Object {$_.Name -eq 'SubjectUserName'} | Select-Object -ExpandProperty '#text')"
       Write-Output "Target: $($EventData | Where-Object {$_.Name -eq 'TargetUserName'} | Select-Object -ExpandProperty '#text')"
       Write-Output "---"
   }

5. Export results for further analysis:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} | Export-Csv -Path "C:\Temp\PasswordChanges.csv" -NoTypeInformation

Investigate Event ID 4782 alongside related events to build a complete picture of the administrative activity.

1. Query for logon events that correlate with the password change:

   $PasswordEvents = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} -MaxEvents 10
   foreach ($Event in $PasswordEvents) {
       $XML = [xml]$Event.ToXml()
       $LogonId = ($XML.Event.EventData.Data | Where-Object {$_.Name -eq 'SubjectLogonId'}).'#text'
       Write-Output "Password change at: $($Event.TimeCreated)"
       Write-Output "Looking for logon events with LogonId: $LogonId"
       Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4624,4625} | Where-Object {$_.Message -like "*$LogonId*"} | Select-Object TimeCreated, Id, Message
   }

2. Check for privilege use events (Event ID 4672) that may precede password changes:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4672} | Where-Object {$_.TimeCreated -gt (Get-Date).AddHours(-1)} | Select-Object TimeCreated, Message

3. Look for process creation events (Event ID 4688) to identify tools used:

   Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4688} | Where-Object {$_.Message -like "*dsa.msc*" -or $_.Message -like "*powershell*"} | Select-Object TimeCreated, Message

4. Create a timeline of related events:

   $StartTime = (Get-Date).AddHours(-2)
   $Events = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4624,4672,4782,4688; StartTime=$StartTime} | Sort-Object TimeCreated
   $Events | Select-Object TimeCreated, Id, LevelDisplayName | Format-Table -AutoSize

Set up comprehensive monitoring for password change events to improve security posture and compliance reporting.

1. Verify audit policy settings using Group Policy or local policy:

   auditpol /get /subcategory:"User Account Management"

2. Enable detailed auditing if not already configured:

   auditpol /set /subcategory:"User Account Management" /success:enable /failure:enable

3. Configure Windows Event Forwarding to centralize logs:
   • Open Group Policy Management
   • Navigate to Computer Configuration → Administrative Templates → Windows Components → Event Forwarding
   • Configure Configure target Subscription Manager
4. Set up custom event log forwarding for Event ID 4782:

   <QueryList>
     <Query Id="0" Path="Security">
       <Select Path="Security">*[System[(EventID=4782)]]</Select>
     </Query>
   </QueryList>

5. Create a scheduled task to monitor and alert on suspicious patterns:

   $Action = New-ScheduledTaskAction -Execute "PowerShell.exe" -Argument "-File C:\Scripts\MonitorPasswordChanges.ps1"
   $Trigger = New-ScheduledTaskTrigger -Once -At (Get-Date) -RepetitionInterval (New-TimeSpan -Minutes 15)
   Register-ScheduledTask -TaskName "Monitor Password Changes" -Action $Action -Trigger $Trigger -RunLevel Highest

6. Configure Security log size to ensure adequate retention:

   wevtutil sl Security /ms:1073741824

Deploy advanced monitoring and automated response capabilities for Event ID 4782 in enterprise environments.

1. Configure Windows Event Collector (WEC) for centralized collection:

   wecutil cs C:\Config\PasswordChangeSubscription.xml

2. Create a PowerShell script for real-time monitoring and alerting:

   # Monitor-PasswordChanges.ps1
   Register-WmiEvent -Query "SELECT * FROM __InstanceCreationEvent WITHIN 5 WHERE TargetInstance ISA 'Win32_NTLogEvent' AND TargetInstance.LogFile = 'Security' AND TargetInstance.EventCode = 4782" -Action {
       $Event = $Event.SourceEventArgs.NewEvent.TargetInstance
       $Message = "Password changed for account: $($Event.Message)"
       Write-EventLog -LogName Application -Source "PasswordMonitor" -EventId 1001 -Message $Message
       # Send notification to SIEM or security team
   }

3. Set up custom Windows Performance Toolkit (WPT) traces for detailed analysis:

   wpr -start GeneralProfile -start CPU -start DiskIO

4. Configure integration with Microsoft Sentinel or third-party SIEM:
   • Install and configure the Log Analytics agent
   • Create custom log collection rules for Event ID 4782
   • Set up KQL queries for pattern detection
5. Implement automated response workflows:

   # Example: Disable account if suspicious password change pattern detected
   $SuspiciousEvents = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782} | Where-Object {$_.TimeCreated -gt (Get-Date).AddMinutes(-5)}
   if ($SuspiciousEvents.Count -gt 10) {
       # Trigger security response
       Write-EventLog -LogName Application -Source "SecurityResponse" -EventId 2001 -Message "Suspicious password change activity detected"
   }

6. Create compliance reports using PowerShell:

   $Report = Get-WinEvent -FilterHashtable @{LogName='Security'; Id=4782; StartTime=(Get-Date).AddDays(-30)} | Group-Object {$_.TimeCreated.Date} | Select-Object Name, Count
   $Report | Export-Csv -Path "C:\Reports\MonthlyPasswordChanges.csv" -NoTypeInformation