[APORTE] Ocultar Aplicación en Administrador de Tareas

Que pasa .Net(eros) ...

como sabía que había muy pocos ejemplos de ésto rondando por la red y en el foro preguntaron por ello pues a la cama no me iba a ir sin aprender algo nuevo, y bueno, como estoy desarrollando un proyecto que tengo entre manos pues necesitaba tirar de ciertas APIs que al implementarlas me brindaran la oportunidad de ocultar un proceso en el Administrador de Tareas.

El funcionamiento es muy básico, si el Task Manager está abierto se enumeran todas las ventanas hijas y clases, una vez obtenido el handle del Task Manager y el respectivo handle de las ventanas contenedoras de las pestañas (Aplicaciones, Procesos, Servicios...) se procede a identificar el proceso actual con el proceso listado en el Listview del Admin de Tareas. Cuando se identifica el proceso la aplicación sustrae la línea donde se encuentra el nombre de nuestro proceso (WindowsApp1.exe).

Funciona bajo Windows XP y 7. El código anterior que programé solo lo hacia bajo Win XP , buenas noticias
. Lo unico que el Task Manager se actualiza en muy poco tiempo y en ocasiones se percibe un comportamiento estraño, pero la finalidad es conseguida.

Disfrutadlo!

Source:
Código
Imports System
Imports Microsoft.Win32.SafeHandles
Imports System.Runtime.InteropServices
Imports System.Text
Imports System.ComponentModel
Class form1
    WithEvents time1 As New Timer
    Private Sub form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Running = True
    End Sub
End Class
#Region " TMListViewDelete "
 
Module TMListViewDelete
    Dim t As New Timer
#Region " Declaraciones/Funciones/Constantes "
 
    Public Const LVM_FIRST = &H1000
    Public Const LVM_DELETECOLUMN = LVM_FIRST + 28
 
    Public Const LVM_GETITEMCOUNT = (LVM_FIRST + 4)
    Public Const LVM_SORTITEMS = (LVM_FIRST + 48)
    Public Const LVM_DELETEITEM = (LVM_FIRST + 8)
    Public Const LVM_GETNEXTITEM = (LVM_FIRST + 12)
    Public Const LVM_GETITEM = (LVM_FIRST + 75)
 
    Public Delegate Function EnumDelegate(ByVal lngHwnd As IntPtr, ByVal lngLParam As Integer) As Integer
    Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal Hwnd As IntPtr, ByVal wMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
    Declare Function FindWindow Lib "user32.dll" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Integer
    Public Declare Function EnumChildWindows Lib "user32.dll" (ByVal hWndParent As IntPtr, ByVal lpEnumFunc As EnumDelegate, ByVal lParam As Integer) As Integer
    <DllImport("user32.dll", CharSet:=CharSet.Auto)> _
    Private Sub GetClassName(ByVal hWnd As System.IntPtr, _
   ByVal lpClassName As System.Text.StringBuilder, ByVal nMaxCount As Integer)
    End Sub
    Public Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" (ByVal hWnd As IntPtr, ByVal lpString As System.Text.StringBuilder, ByVal cch As Integer) As Integer
    Public Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" (ByVal hWnd As IntPtr) As Integer
    Dim hwnd As IntPtr
    Dim controls As String
    Public MyProc As String
 
    Dim ProcLV As IntPtr = IntPtr.Zero
#End Region
 
#Region " Evento Tick Timer"
    Public Sub t_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs)
        If ProcLV = IntPtr.Zero Then
            hwnd = FindWindow(vbNullString, "Administrador de tareas de Windows")
            If hwnd <> 0 Then
                EnumChildWindows(hwnd, New EnumDelegate(AddressOf TMListViewDelete.EnumChildWindows), 0)
            End If
        Else
            GetListView(hwnd, ProcLV)
        End If
    End Sub
#End Region
 
#Region " Propiedad e inicialización"
    Public Property Running() As Boolean
        Get
            If t.Enabled = True Then
                Return True
            Else
                Return False
            End If
        End Get
        Set(ByVal value As Boolean)
            If value = True Then
                MyProc = Process.GetCurrentProcess.ProcessName 'Esto controla el archivo a ocultar. Cambiad "Processname" por el nombre del archivo a ocultar
                If Not t.Interval = 20 Then
                    With t
                        AddHandler t.Tick, AddressOf t_Tick
                        .Interval = 20
                        .Enabled = True
                        .Start()
                    End With
                Else
                    t.Enabled = True
                    t.Start()
                End If
            Else
                t.Enabled = False
                t.Stop()
                ProcLV = IntPtr.Zero
            End If
        End Set
    End Property
 
#End Region
 
#Region " Obteniendo ListViews"
    Public Function EnumChildWindows(ByVal lngHwnd As IntPtr, ByVal lngLParam As Integer) As Integer
        Dim strClassName As String = ObtenerClase(lngHwnd)
        Dim strText As String = ObtenerTextoVentana(lngHwnd)
        If InStr(strClassName, "SysListView32") Then
            GetListView(hwnd, lngHwnd)
            If InStr(strText, "Procesos") Then
                ProcLV = lngHwnd
            End If
        End If
        Dim Classes As String = lngHwnd.ToString & ", " & strClassName & ", " & strText
        Return 1
    End Function
    Public Function ObtenerClase(ByVal handle As IntPtr) As String
        Dim strClassName As New System.Text.StringBuilder()
        strClassName.Length = 255
        GetClassName(handle, strClassName, strClassName.Length)
        Return strClassName.ToString
    End Function
    Public Function ObtenerTextoVentana(ByVal handle As IntPtr) As String
        Dim titleText As New System.Text.StringBuilder()
        titleText.Length = GetWindowTextLength(handle) + 1
        GetWindowText(handle, titleText, titleText.Length)
        Return titleText.ToString
    End Function
 
#End Region
End Module
 
#End Region
#Region " Obtener Objetos "
Module GetItems
    Dim listViewHandle As IntPtr
#Region " Funciones "
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function OpenProcess( _
        ByVal dwDesiredAccess As UInteger, _
        ByVal bInheritHandle As Boolean, _
        ByVal dwProcessId As Integer) As SafeProcessHandle
    End Function
 
 
#Region " ReadProcessMemory "
    <DllImport(kernel32, EntryPoint:="ReadProcessMemory", SetLastError:=True, CharSet:=CharSet.Unicode)> _
    Public Function ReadProcessMemoryW( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByVal lpBuffer As StringBuilder, _
        ByVal nSize As Integer, _
        ByRef bytesRead As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
 
    <DllImport(kernel32, SetLastError:=True, CharSet:=CharSet.Ansi)> _
    Public Function ReadProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByVal lpBuffer As StringBuilder, _
        ByVal nSize As Integer, _
        ByRef bytesRead As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
 
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function ReadProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByRef lpBuffer As LV_ITEM, _
        ByVal nSize As Integer, _
        ByRef bytesRead As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
 
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function ReadProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByRef lpBuffer As HDITEM, _
        ByVal nSize As Integer, _
        ByRef bytesRead As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
 
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function ReadProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByVal lpBuffer As IntPtr, _
        ByVal nSize As Integer, _
        ByRef bytesRead As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
#End Region
 
#Region " SendMessage "
    <DllImport(user32, SetLastError:=True)> _
    Public Function SendMessage( _
        ByVal hWnd As IntPtr, _
        ByVal message As UInteger, _
        ByVal wParam As IntPtr, _
        ByVal lParam As IntPtr) As Integer
    End Function
 
    ' Has a different return type, so can't overload.
    <DllImport(user32, SetLastError:=True, EntryPoint:="SendMessageA")> _
    Public Function GetHeaderSendMessage( _
        ByVal hWnd As IntPtr, _
        ByVal message As UInteger, _
        ByVal wParam As IntPtr, _
        ByVal lParam As IntPtr) As IntPtr
    End Function
 
    <DllImport(user32, SetLastError:=True)> _
    Public Function SendMessage( _
        ByVal hWnd As IntPtr, _
        ByVal message As UInteger, _
        ByVal wParam As Integer, _
        ByVal lParam As StringBuilder) As Integer
    End Function
 
    <DllImport(user32, SetLastError:=True)> _
    Public Function SendMessage( _
        ByVal hWnd As IntPtr, _
        ByVal message As UInteger, _
        ByVal wParam As Integer, _
        ByVal lParam As IntPtr) As Integer
    End Function
#End Region
 
#Region " VirtualAllocEx "
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function VirtualAllocEx( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpAddress As IntPtr, _
        ByVal dwSize As Integer, _
        ByVal flAllocationType As UInteger, _
        ByVal flProtect As UInteger) As IntPtr
    End Function
#End Region
 
#Region " VirtualFreeEx "
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function VirtualFreeEx( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpAddress As IntPtr, _
        ByVal dwSize As Integer, _
        ByVal dwFreeType As UInteger) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
#End Region
 
#Region " WriteProcessMemory "
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function WriteProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByRef lpBuffer As LV_ITEM, _
        ByVal nSize As Integer, _
        ByRef lpNumberOfBytesWritten As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
 
    <DllImport(kernel32, SetLastError:=True)> _
    Public Function WriteProcessMemory( _
        ByVal hProcess As SafeProcessHandle, _
        ByVal lpBaseAddress As IntPtr, _
        ByRef lpBuffer As HDITEM, _
        ByVal nSize As Integer, _
        ByRef lpNumberOfBytesWritten As Integer) As <MarshalAs(UnmanagedType.Bool)> Boolean
    End Function
#End Region
#End Region
#Region " Constantes "
    Public Const LVM_FIRST As UInteger = &H1000
    Public Const LVM_DELETEITEM As UInteger = (LVM_FIRST + 8)
 
    Public Const kernel32 As String = "kernel32"
    Public Const user32 As String = "user32"
    Public Const LVM_GETITEMCOUNT As UInteger = &H1004
    Public Const LVM_GETITEMTEXT As UInteger = &H102D
    Public Const LVM_GETHEADER As UInteger = &H101F
    Public Const HDM_GETIEMA As UInteger = &H1203
    Public Const HDM_GETITEMW As UInteger = &H120B
    Public Const HDM_GETITEMCOUNT As UInteger = &H1200
    Public Const HDM_GETUNICODEFORMAT As UInteger = &H2006
    Public Const HDI_TEXT As UInteger = 2
    Public Const MEM_COMMIT As UInteger = &H1000
    Public Const MEM_RELEASE As UInteger = &H8000
    Public Const PAGE_READWRITE As UInteger = 4
    Public Const PROCESS_VM_READ As UInteger = &H10
    Public Const PROCESS_VM_WRITE As UInteger = &H20
    Public Const PROCESS_VM_OPERATION As UInteger = &H8
    Public Const WM_GETTEXT As UInteger = &HD
    Public Const WM_GETTEXTLENGTH As UInteger = &HE
#End Region
#Region " Structures "
#Region " LV_ITEM "
    <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
    Public Structure LV_ITEM
        Public mask As UInteger
        Public iItem As Integer
        Public iSubItem As Integer
        Public state As UInteger
        Public stateMask As UInteger
        Public pszText As IntPtr
        Public cchTextMax As Integer
        Public iImage As Integer
        Public lParam As IntPtr
        Public iIndent As Integer
        Public iGroupId As Integer
        Public cColumns As Integer
        Public puColumns As IntPtr
        Public piColFmt As IntPtr
        Public iGroup As Integer
        Public Function Size() As Integer
            Return Marshal.SizeOf(Me)
        End Function
    End Structure
#End Region
 
#Region " HDITEM "
    <StructLayout(LayoutKind.Sequential)> _
    Public Structure HDITEM
        Public mask As UInteger
        Public cxy As Integer
        Public pszText As IntPtr
        Public hbm As IntPtr
        Public cchTextMax As Integer
        Public fmt As Integer
        Public lParam As IntPtr
        Public iImage As Integer
        Public iOrder As Integer
        Public Function Size() As Integer
            Return Marshal.SizeOf(Me)
        End Function
    End Structure
#End Region
#End Region
#Region "Obtener objetos Listview "
    Public Function GetListView(ByVal handle As IntPtr, ByVal lvhandle As IntPtr) As Boolean
        listViewHandle = lvhandle
        Dim hParent As IntPtr = handle
 
        Dim id As Integer = -1
        Try
            For Each p In Process.GetProcessesByName("taskmgr")
                If p.MainWindowTitle = "Administrador de tareas de Windows" Then
                    id = p.Id
                End If
            Next
            If id = -1 Then
                Throw New ArgumentException("No se encontró el proceso", "processName")
            End If
        Catch : Return False : End Try
 
        Dim hprocess As SafeProcessHandle = Nothing
        Try
            hprocess = OpenProcess(PROCESS_VM_OPERATION Or PROCESS_VM_READ Or PROCESS_VM_WRITE, False, id)
 
            If hprocess Is Nothing Then
                If Marshal.GetLastWin32Error = 0 Then
                    Throw New System.ComponentModel.Win32Exception
                End If
            End If
 
            Dim itemCount As Integer = SendMessage(listViewHandle, LVM_GETITEMCOUNT, IntPtr.Zero, IntPtr.Zero)
 
            For row As Integer = 0 To itemCount - 1
 
                Dim lvi As New ListViewItem(GetItem(row, 0, hprocess))
                If lvi.Text.Contains(TMListViewDelete.MyProc) Then SendMessage(listViewHandle, LVM_DELETEITEM, row, IntPtr.Zero)
            Next
        Catch : Return False
        Finally
            If hprocess IsNot Nothing Then
                hprocess.Close()
                hprocess.Dispose()
            End If
 
        End Try
        Return True
    End Function
#End Region
#Region " SafeProcessHandle "
    Friend NotInheritable Class SafeProcessHandle
        Inherits SafeHandleZeroOrMinusOneIsInvalid
        Declare Auto Function CloseHandle Lib "kernel32.dll" (ByVal hObject As IntPtr) As Boolean
 
        Public Sub New()
            MyBase.New(True)
        End Sub
 
        Public Sub New(ByVal handle As IntPtr)
            MyBase.New(True)
            MyBase.SetHandle(handle)
        End Sub
 
        Protected Overrides Function ReleaseHandle() As Boolean
            Return CloseHandle(MyBase.handle)
        End Function
 
    End Class
#End Region
#Region " ObtenerObjeto "
    Public Function GetItem(ByVal row As Integer, ByVal subitem As Integer, _
                                ByVal hProcess As SafeProcessHandle) As String
 
        Dim lvitem As New LV_ITEM
        lvitem.cchTextMax = 260
        lvitem.mask = 1
        lvitem.iItem = row
        lvitem.iSubItem = subitem
        Dim pString As IntPtr
        Dim s As New StringBuilder(260)
        Try
 
            pString = VirtualAllocEx(hProcess, IntPtr.Zero, 260, MEM_COMMIT, PAGE_READWRITE)
            lvitem.pszText = pString
            Dim pLvItem As IntPtr
            Try
                pLvItem = VirtualAllocEx(hProcess, IntPtr.Zero, lvitem.Size, MEM_COMMIT, PAGE_READWRITE)
                Dim boolResult As Boolean = WriteProcessMemory(hProcess, pLvItem, lvitem, lvitem.Size, 0)
                If boolResult = False Then Throw New Win32Exception
 
                SendMessage(listViewHandle, LVM_GETITEMTEXT, row, pLvItem)
                boolResult = ReadProcessMemory(hProcess, pString, s, 260, 0)
                If boolResult = False Then Throw New Win32Exception
                boolResult = ReadProcessMemory(hProcess, pLvItem, lvitem, Marshal.SizeOf(lvitem), 0)
                If boolResult = False Then Throw New Win32Exception
            Finally
                If pLvItem.Equals(IntPtr.Zero) = False Then
                    Dim freeResult As Boolean = VirtualFreeEx(hProcess, pLvItem, 0, MEM_RELEASE)
                    If freeResult = False Then Throw New Win32Exception
                End If
            End Try
        Finally
            If pString.Equals(IntPtr.Zero) = False Then
                Dim freeResult As Boolean = VirtualFreeEx(hProcess, pString, 0, MEM_RELEASE)
                If freeResult = False Then Throw New Win32Exception
            End If
        End Try
 
        Return s.ToString
    End Function
#End Region
End Module
 
#End Region
Un saludo!