PowerShell function to search event logs of domain controllers for event ID 4740, and returns the time the event was logged (LockedTime), the user account SamAccountName (Account), the source computer (LockedFrom), and the current locked status (Locked)

Get-LockedADAccounts.ps1

Function Get-LockedADAccounts {
  <#
	
  .Synopsis
  Gets lockout events from event logs on domain controllers

  .Description
	Searches event logs of domain controllers for event ID 4740, and returns the time the event was logged (LockedTime), the user account SamAccountName (Account), the source computer (LockedFrom), and the current locked status (Locked)
    
  .Example
	Needs no parameters, run like so

  Get-LockedADAccounts

  .Notes
  Ben Neise 2013-23-04
    
  #>

	# Create an empty array for the results
	$arrResults = @()
	# Get a list of domain controllers
	$objDomainContext = New-Object System.DirectoryServices.ActiveDirectory.DirectoryContext("Domain",(`
		[System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain().Name)
	)
	$objDomainControllers = [System.DirectoryServices.ActiveDirectory.DomainController]::FindAll($objDomainContext)
	# Iterate through the domain controllers
	ForEach ($objDomainController in ($objDomainControllers  | Sort-Object Name)) {
		Write-Host "Getting lockout events on:" $objDomainController.Name
		# Grab the events matching the account lockout ID
		Try {
			# Using SilentlyContinue to avoid displaying errors when no matching events are found)
			$wmiEvents = @(Get-WinEvent -FilterHashTable @{LogName='Security'; Id=4740} -ComputerName $objDomainController.Name -ErrorAction SilentlyContinue)
		}
		Catch {
			Write-Host "ERROR Can't get events, $_"
			# Move onto the next DC
			Continue
		}
		ForEach ($wmiEvent in $wmiEvents){
			# Convert the event into an XML object
			[xml]$XMLEvent = $wmiEvent.ToXML()
			# Get the data from the XML, and append it to the WMI object
			ForEach ($object in $XMLEvent.Event.EventData.Data){
				$wmiEvent | Add-Member -Name ($object.Name) -MemberType NoteProperty -Value ($object."#text")
			}
			# Add the WMI object to the results array
			$arrResults += $wmiEvent
		}
	}
	Return ($arrResults | Sort-Object TimeCreated -Descending | Select-Object `
		@{N="LockedTime";E={@($_.TimeCreated)}},`
		@{N="Account";E={@($_.TargetUserName)}},`
		@{N="LockedFrom";E={@($_.TargetDomainName)}},`
		@{N="Locked";E={@((Get-QADUser $_.TargetUserName).AccountIsLockedOut)}} | Get-Unique -AsString
	)
}