MS Office 2013 - VBA密码安全

Question

我想知道MS Office 2013中的VBA密码有多安全。

我在网上搜索了一些网站，它们出售软件来破解密码，这可靠吗？

我想为我的办公文件开发一些安全措施，这些措施将依赖于VBA代码，但如果VBA代码可以轻易地被更改/查看，那么这种方法就没有意义。

谢谢

- Christopher Bailey

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那要看情况。你认为攻击者会有多大的决心呢？你会发现这很有趣。http://superuser.com/q/807926/361752 - RubberDuck

我想知道这是否很容易做到，这是我的问题。谢谢 - Christopher Bailey

看看那个链接，告诉我它有多容易？=;)- - RubberDuck

但我猜这不适用于Office 2013，或者是我错过了什么？ - Christopher Bailey

滚动到答案底部，它涉及新的XML格式办公文件。基本上，这只会阻止普通用户查看您的代码。如果有人正在攻击它，他们还是能够进入。 - RubberDuck

我尝试了最后一个针对xlsm文件的解决方案，但是没有成功。我收到了一个文件损坏的错误消息。 - Christopher Bailey

Answer 1

使用此答案作为参考：如何破解Excel VBA项目的密码？ 不必进行所有十六进制操作。您可以尝试这个方法。它适用于任何文件（*.xls, *.xlsm, *.xlam ...）。在Excel 2007、Excel 2010和Excel 2013的32位版本上测试并运行。

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.

备注：此代码由一位名叫Siwtom（昵称）的越南开发者编写。您可以将此代码转换为Excel插件以供经常使用。

- Hugo Hilário