Add Get-UserLastLogonComputer.ps1 - exports users and last PC to CSV

Get-UserLastLogonComputer.ps1

@@ -0,0 +1,142 @@
+#Requires -Modules ActiveDirectory
+<#
+.SYNOPSIS
+    Exports a list of users and the last PC they logged into.
+
+.DESCRIPTION
+    Queries Domain Controller security event logs for interactive logon events (4624)
+    to determine which computer each user last authenticated from.
+
+.PARAMETER OutputPath
+    Path for the output CSV file. Defaults to current directory.
+
+.PARAMETER DaysBack
+    Number of days of event logs to search. Default is 7.
+
+.PARAMETER LogonTypes
+    Array of logon types to include. Default is 2 (Interactive) and 10 (RemoteInteractive/RDP).
+
+.EXAMPLE
+    .\Get-UserLastLogonComputer.ps1
+
+.EXAMPLE
+    .\Get-UserLastLogonComputer.ps1 -OutputPath "C:\Reports" -DaysBack 30
+
+.NOTES
+    Must be run on a Domain Controller with appropriate permissions to read Security logs.
+    Logon Type 2 = Interactive (console)
+    Logon Type 10 = RemoteInteractive (RDP)
+    Logon Type 11 = CachedInteractive
+#>
+
+[CmdletBinding()]
+param(
+    [Parameter()]
+    [string]$OutputPath = (Get-Location).Path,
+
+    [Parameter()]
+    [int]$DaysBack = 7,
+
+    [Parameter()]
+    [int[]]$LogonTypes = @(2, 10, 11)
+)
+
+$Timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
+$CsvFile = Join-Path $OutputPath "UserLastLogonComputer_$Timestamp.csv"
+
+Write-Host "`nQuerying security event logs for the last $DaysBack days..." -ForegroundColor Cyan
+Write-Host "Looking for logon types: $($LogonTypes -join ', ')" -ForegroundColor Cyan
+Write-Host ""
+
+$StartDate = (Get-Date).AddDays(-$DaysBack)
+
+# Build XPath filter for Event ID 4624 (Successful Logon)
+$LogonTypeFilter = ($LogonTypes | ForEach-Object { "Data[@Name='LogonType']=$_" }) -join " or "
+$XPath = @"
+*[System[
+    EventID=4624 
+    and TimeCreated[@SystemTime >= '$($StartDate.ToUniversalTime().ToString("o"))']
+  ]
+  and EventData[
+    ($LogonTypeFilter)
+  ]
+]
+"@
+
+try {
+    Write-Host "Retrieving logon events from Security log..." -ForegroundColor Yellow
+    
+    $Events = Get-WinEvent -LogName Security -FilterXPath $XPath -ErrorAction Stop |
+        Where-Object {
+            $xml = [xml]$_.ToXml()
+            $targetUser = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'TargetUserName' }).'#text'
+            $targetDomain = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'TargetDomainName' }).'#text'
+            # Filter out computer accounts and system accounts
+            $targetUser -notmatch '\$$' -and 
+            $targetUser -notin @('SYSTEM', 'LOCAL SERVICE', 'NETWORK SERVICE', 'DWM-1', 'DWM-2', 'UMFD-0', 'UMFD-1') -and
+            $targetDomain -ne 'Window Manager' -and
+            $targetDomain -ne 'Font Driver Host'
+        }
+
+    Write-Host "Found $($Events.Count) logon events. Processing..." -ForegroundColor Yellow
+
+    $UserLogons = @{}
+
+    foreach ($Event in $Events) {
+        $xml = [xml]$Event.ToXml()
+        
+        $Username = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'TargetUserName' }).'#text'
+        $Domain = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'TargetDomainName' }).'#text'
+        $Workstation = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'WorkstationName' }).'#text'
+        $LogonType = ($xml.Event.EventData.Data | Where-Object { $_.Name -eq 'LogonType' }).'#text'
+        $LogonTime = $Event.TimeCreated
+
+        if ([string]::IsNullOrWhiteSpace($Workstation)) {
+            $Workstation = "Unknown"
+        }
+
+        $UserKey = "$Domain\$Username"
+
+        # Keep only the most recent logon for each user
+        if (-not $UserLogons.ContainsKey($UserKey) -or $LogonTime -gt $UserLogons[$UserKey].LogonTime) {
+            $UserLogons[$UserKey] = [PSCustomObject]@{
+                Domain        = $Domain
+                Username      = $Username
+                Computer      = $Workstation.ToUpper()
+                LogonTime     = $LogonTime
+                LogonType     = switch ($LogonType) {
+                    2  { "Interactive" }
+                    10 { "RDP" }
+                    11 { "Cached" }
+                    default { $LogonType }
+                }
+            }
+        }
+    }
+
+    $Results = $UserLogons.Values | Sort-Object Domain, Username
+
+    if ($Results.Count -eq 0) {
+        Write-Host "`nNo user logon events found in the specified time period." -ForegroundColor Yellow
+        return
+    }
+
+    # Export to CSV
+    $Results | Select-Object Domain, Username, Computer, LogonTime, LogonType | 
+        Export-Csv -Path $CsvFile -NoTypeInformation -Encoding UTF8
+
+    Write-Host "`n===== Results =====" -ForegroundColor Green
+    Write-Host "Total users found: $($Results.Count)"
+    Write-Host "Output saved to:   $CsvFile"
+    Write-Host ""
+
+    # Display summary table
+    $Results | Format-Table -AutoSize
+
+} catch [System.Diagnostics.Eventing.Reader.EventLogNotFoundException] {
+    Write-Host "`nError: Security event log not accessible. Ensure you're running on a DC with appropriate permissions." -ForegroundColor Red
+} catch [System.UnauthorizedAccessException] {
+    Write-Host "`nError: Access denied. Run as Administrator with permissions to read Security logs." -ForegroundColor Red
+} catch {
+    Write-Host "`nError: $($_.Exception.Message)" -ForegroundColor Red
+}