Set w = CreateObject("Messenger.UIAutomation")
For Each ConTacto In w.MyContacts 'Vamos de contacto en contacto
If ConTacto.Status = 2 Then 'Si el contacto esta OnLine...
Set iMsn = w.InstantMessage(ConTacto.SigninName) 'abrimos la ventana de chat
Call SpamMsn(iMsn.hwnd) 'Esta funcion es la que hace el trabajo
Next

Private Sub SpamMsn(ByVal mHwnd)
On Error Resume Next
Dim l As Long, spam As String

l = FindWindowEx(mHwnd, 0, "DirectUIHWND", vbNullString) 'Buscamos esa clase dentro de la ventana
If l = 0 Then Exit Sub 'Si no es asi, nos vamos al carajo
Call SendText(l, "visita Elhacker.net") 'Mensaje a enviar
End Sub


Public Sub SendText(pIMWindow As Long, sText As String)
Dim hDirectUI As Long, hPrevWnd As Long
Dim i As Integer
hDirectUI = pIMWindow
Do
Call SetForegroundWindow(hDirectUI)
Loop Until GetForegroundWindow = hDirectUI
For i = 1 To Len(sText)
Call PostMessage(hDirectUI, WM_CHAR, Asc(Mid(sText, i, 1)), 0&)
Next i
Call PostMessage(hDirectUI, WM_KEYDOWN, VK_RETURN, 0&)
Call PostMessage(hDirectUI, WM_KEYUP, VK_RETURN, 0&)
End Sub