如何利用VBA移除EXCEL文件的密码保护

收到了客户两张电子表格，需要修改几项数据，其中一张表格是直接可以修改的，但同一压缩包里的另一个文件则显示收保护，读取没问题，修改就不行了，询问客户密码也是一问三不知。无奈在51CTO找了这么一个暴力测试的方案，程序会在成功后弹窗提示该文件可能的密码。类似的代码在知乎也看到过，51CTO的更为简洁但删除了一些作者注释（包含代码作者信息），于是重新翻了一下知乎，加上了代码作者的名字。

Sub PasswordBreaker()
    '作者:McCormick JE McGimpsey
    Dim i As Integer, j As Integer, k As Integer
    Dim l As Integer, m As Integer, n As Integer
    Dim i1 As Integer, i2 As Integer, i3 As Integer
    Dim i4 As Integer, i5 As Integer, i6 As Integer
    On Error Resume Next
    For i = 65 To 66: For j = 65 To 66: For k = 65 To 66
    For l = 65 To 66: For m = 65 To 66: For i1 = 65 To 66
    For i2 = 65 To 66: For i3 = 65 To 66: For i4 = 65 To 66
    For i5 = 65 To 66: For i6 = 65 To 66: For n = 32 To 126
    ActiveSheet.Unprotect Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
    If ActiveSheet.ProtectContents = False Then
    MsgBox "One usable password is " & Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
    ActiveWorkbook.Sheets(1).Select
    Range("a1").FormulaR1C1 = Chr(i) & Chr(j) & Chr(k) & Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
    Exit Sub
    End If
    Next: Next: Next: Next: Next: Next
    Next: Next: Next: Next: Next: Next
End Sub

程序会尝试一些可能的密码组合，因为组合较多，所以过于复杂的密码会耗费较长时间，耐心等待。当然一般表格保护只是用于避免用户误操作，极少会设置复杂度爆表的密码。这里的多重循环，实际上前面几段都是在重复取A或者B,仅For n = 32 To 126这一句测试了多个字符，博主测试了一下密码12345，破解后提示可用密码为AABBAABBBAAW，感觉这段程序并不是单纯的暴力破解，而是利用了EXCEL的密码生成机制。