依據下面步驟操作即可，但請注意以下程式碼僅適用於32位元環境的Office，64位元須另行處理
1. 在Excel VBE環境中新增一個模組，將以下程式碼複製到裡面執行。
2. 開啟含有加密的Excel 檔案即可。
Option Explicit
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 Gettr(ByVal Value As Long) As Long
'獲得函數的位址
GetPtr = Value
End Function
Public Sub RecoverBytes()
'若已經hook,則恢復原API開頭的6位元組,也就是恢復原來函數的功能
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
'VBE6.dll調用DialogBoxParamA顯示VB6INTL.dll資源中的第4070號對話方塊(就是輸入密碼的視窗)
'若DialogBoxParamA返回值非0,則VBE會認為密碼正確,所以我們要hook DialogBoxParamA函數
pFunc = GetProcAddress(GetModuleHandleA("user32.dll"), "DialogBoxParamA")
'標準api hook過程之一: 修改記憶體屬性,使其可寫
If VirtualProtect(ByVal pFunc, 6, &H40, OriginProtect) <> 0 Then
'標準api hook過程之二: 判斷是否已經hook,看看API的第一個位元組是否為&H68,
'若是則說明已經Hook
MoveMemory ByVal VarPtr(TmpBytes(0)), ByVal pFunc, 6
If TmpBytes(0) <> &H68 Then
'標準api hook過程之三: 保存原函數開頭位元組,這裡是6個位元組,以備後面恢復
MoveMemory ByVal VarPtr(OriginBytes(0)), ByVal pFunc, 6
'用AddressOf獲取MyDialogBoxParam的地址
'因為語法不允許寫成p = AddressOf MyDialogBoxParam,這裡我們寫一個函數
'GetPtr,作用僅僅是返回AddressOf MyDialogBoxParam的值,從而實現將
'MyDialogBoxParam的位址付給p的目的
p = GetPtr(AddressOf MyDialogBoxParam)
'標準api hook過程之四: 組裝API入口的新代碼
'HookBytes 組成如下彙編
'push MyDialogBoxParam的地址
'ret
'作用是跳轉到MyDialogBoxParam函數
HookBytes(0) = &H68
MoveMemory ByVal VarPtr(HookBytes(1)), ByVal VarPtr(p), 4
HookBytes(5) = &HC3
'標準api hook過程之五: 用HookBytes的內容改寫API前6個位元組
MoveMemory ByVal pFunc, ByVal VarPtr(HookBytes(0)), 6
'設置hook成功標誌
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
'有程式調用DialogBoxParamA裝入4070號對話方塊,這裡我們直接返回1,讓
'VBE以為密碼正確了
MyDialogBoxParam = 1
Else
'有程式調用DialogBoxParamA,但裝入的不是4070號對話方塊,這裡我們調用
'RecoverBytes函數恢復原來函數的功能,在進行原來的函數
RecoverBytes
MyDialogBoxParam = DialogBoxParam(hInstance, pTemplateName, _
hWndParent, lpDialogFunc, dwInitParam)
'原來的函數執行完畢,再次hook
Hook
End If
End Function
Sub 破解()
If Hook Then
MsgBox "VBA Project 密碼破解成功!", vbInformation, "*****"
End If
End Sub
Sub 恢復()
RecoverBytes
MsgBox "VBA Project 密碼恢復成功!", vbInformation, "*****"
End Sub
參考資料