MS Office 2013 - VBA password security [duplicate]

问题:

This question already has an answer here:

• Is there a way to crack the password on an Excel VBA Project? 22 answers

I am wondering about how safe is the VBA password on MS Office 2013.

I've searched online and there are a bunch of websites selling software to do it, is it reliable?

I want to develop some security around my office files that would depend on the VBA code inside, but if the vba code inside can be easily changed/seen it's non sense going that way.

Thanks

回答1:

Using this answer as reference : Is there a way to crack the password on an Excel VBA Project?

Instead of doing all the Hex stuffs. You can try this. It will work for any files (*.xls, *.xlsm, *.xlam ...). Tested and works on Excel 2007, Excel 2010 and Excel 2013 - 32 bit version.

1. Open the file(s) that contain your locked VBA Projects

2. Create a new xlsm file and store this code in Module1

   Option Explicit
   
   Private Const PAGE_EXECUTE_READWRITE = &H40
   
   Private Declare Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" _
           (Destination As Long, Source As Long, ByVal Length As Long)
   
   Private Declare Function VirtualProtect Lib "kernel32" (lpAddress As Long, _
           ByVal dwSize As Long, ByVal flNewProtect As Long, lpflOldProtect As Long) As Long
   
   Private Declare Function GetModuleHandleA Lib "kernel32" (ByVal lpModuleName As String) As Long
   
   Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As Long, _
           ByVal lpProcName As String) As Long
   
   Private Declare Function DialogBoxParam Lib "user32" Alias "DialogBoxParamA" (ByVal hInstance As Long, _
           ByVal pTemplateName As Long, ByVal hWndParent As Long, _
           ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer
   
   Dim HookBytes(0 To 5) As Byte
   Dim OriginBytes(0 To 5) As Byte
   Dim pFunc As Long
   Dim Flag As Boolean
   
   Private Function GetPtr(ByVal Value As Long) As Long
       GetPtr = Value
   End Function
   
   Public Sub RecoverBytes()
       If Flag Then MoveMemory ByVal pFunc, ByVal VarPtr(OriginBytes(0)), 6
   End Sub
   
   Public Function Hook() As Boolean
       Dim TmpBytes(0 To 5) As Byte
       Dim p As Long
       Dim OriginProtect As Long
   
       Hook = False
   
       pFunc = GetProcAddress(GetModuleHandleA("user32.dll"), "DialogBoxParamA")
   
   
       If VirtualProtect(ByVal pFunc, 6, PAGE_EXECUTE_READWRITE, OriginProtect) <> 0 Then
   
           MoveMemory ByVal VarPtr(TmpBytes(0)), ByVal pFunc, 6
           If TmpBytes(0) <> &H68 Then
   
               MoveMemory ByVal VarPtr(OriginBytes(0)), ByVal pFunc, 6
   
               p = GetPtr(AddressOf MyDialogBoxParam)
   
               HookBytes(0) = &H68
               MoveMemory ByVal VarPtr(HookBytes(1)), ByVal VarPtr(p), 4
               HookBytes(5) = &HC3
   
               MoveMemory ByVal pFunc, ByVal VarPtr(HookBytes(0)), 6
               Flag = True
               Hook = True
           End If
       End If
   End Function
   
   Private Function MyDialogBoxParam(ByVal hInstance As Long, _
           ByVal pTemplateName As Long, ByVal hWndParent As Long, _
           ByVal lpDialogFunc As Long, ByVal dwInitParam As Long) As Integer
       If pTemplateName = 4070 Then
           MyDialogBoxParam = 1
       Else
           RecoverBytes
           MyDialogBoxParam = DialogBoxParam(hInstance, pTemplateName, _
                              hWndParent, lpDialogFunc, dwInitParam)
           Hook
       End If
   End Function
   

3. Paste this code in Module2 and run it

   Sub unprotected()
       If Hook Then
           MsgBox "VBA Project is unprotected!", vbInformation, "*****"
       End If
   End Sub
   

4. Come back to your VBA Projects and enjoy.

P/S: This code is credited to Siwtom (nick name), a vietnamese developer. You could turn this code into an Excel addin for frequently usage.