EXCEL密码破解.doc

EXCEL 密码破解

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工具 --- 宏 ----- 宏 ,选 AllInternalPasswords, 运行 ,确定两次 ,等 2 分钟 ,再确定 .OK, 没有密码了 !!

内容如下：

Public Sub AllInternalPasswords()

'Breaks worksheet and workbook structure passwords. Bob McCormick

'probably originator of base code algorithm modified for coverage

'of workbook structure / windows passwords and for multiple passwords

'

'Norman Harker and JE McGimpsey 27-Dec-2002 (Version 1.1)

'Modified 2003-Apr-04 by JEM: All msgs to constants, and

'eliminate one Exit Sub (Version 1.1.1)

'Reveals hashed passwords NOT original passwords

Const DBLSPACE As String = vbNewLine & vbNewLine

Const AUTHORS As String = DBLSPACE & vbNewLine & _

"Adapted from Bob McCormick base code by" & _

"Norman Harker and JE McGimpsey"

Const HEADER As String = "AllInternalPasswords User Message"

Const VERSION As String = DBLSPACE & "Version 1.1.1 2003-Apr-04"

Const REPBACK As String = DBLSPACE & "Please report failure " & _

"to the microsoft.public.excel.programming newsgroup."

Const ALLCLEAR As String = DBLSPACE & "The workbook should " & _

"now be free of all password protection, so make sure you:" & _

DBLSPACE & "SAVE IT NOW!" & DBLSPACE & "and also" & _

DBLSPACE & "BACKUP!, BACKUP!!, BACKUP!!!" & _

DBLSPACE & "Also, remember that the password was " & _

"put there for a reason. Don't stuff up crucial formulas " & _ "or

data." & DBLSPACE & "Access and use of some data " & _

"may be an offense. If in doubt, don't."

Const MSGNOPWORDS1 As String = "There were no passwords on " & _

"sheets, or workbook structure or windows." & AUTHORS & VERSION

Const MSGNOPWORDS2 As String = "There was no protection to " & _

"workbook structure or windows." & DBLSPACE & _ "Proceeding to

unprotect sheets." & AUTHORS & VERSION

Const MSGTAKETIME As String = "After pressing OK button this " & _

"will take some time." & DBLSPACE & "Amount of time " & _ "depends

on how many different passwords, the " & _

"passwords, and your computer's specification." & DBLSPACE & _

"Just be patient! Make me a coffee!" & AUTHORS & VERSION Const MSGPWORDFOUND1 As String = "You had a Worksheet " & _ "Structure or Windows Password set." & DBLSPACE & _

"The password found was: " & DBLSPACE & "$$" & DBLSPACE & _ "Note it down for potential future use in other workbooks by " & _ "the same person who set this password." & DBLSPACE & _

"Now to check and clear other passwords." & AUTHORS & VERSION Const MSGPWORDFOUND2 As String = "You had a Worksheet " & _ "password set." & DBLSPACE & "The password found was: " & _ DBLSPACE & "$$" & DBLSPACE & "Note it down for potential " & _ "future use in other workbooks by same person who " & _

"set this password." & DBLSPACE & "Now to check and clear " & _ "other passwords." & AUTHORS & VERSION

Const MSGONL YONE As String = "Only structure / windows " & _ "protected with the password that was just found." & _ ALLCLEAR

& AUTHORS & VERSION & REPBACK

Dim w1 As Worksheet, w2 As Worksheet

Dim i As Integer, j As Integer, k As Integer, l As Integer

Dim m As Integer, n As Integer, i1 As Integer, i2 As Integer

Dim i3 As Integer, i4 As Integer, i5 As Integer, i6 As Integer

Dim PWord1 As String

Dim ShTag As Boolean, WinTag As Boolean

Application.ScreenUpdating = False

With ActiveWorkbook

WinTag = .ProtectStructure Or .ProtectWindows

End With

ShTag = False

For Each w1 In Worksheets

ShTag = ShTag Or w1.ProtectContents

Next w1

If Not ShTag And Not WinTag Then

MsgBox MSGNOPWORDS1, vbInformation, HEADER

Exit Sub

End If

MsgBox MSGTAKETIME, vbInformation, HEADER

If Not WinTag Then

MsgBox MSGNOPWORDS2, vbInformation, HEADER

Else

On Error Resume Next

Do 'dummy do loop

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

With ActiveWorkbook

.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 .ProtectStructure = False And _

.ProtectWindows = False Then

PWord1 = Chr(i) & Chr(j) & Chr(k) & Chr(l) & _

Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _

Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)

MsgBox Application.Substitute(MSGPWORDFOUND1, _ "$$", PWord1), vbInformation, HEADER

Exit Do 'Bypass all for...nexts

End If

End With

Next: Next: Next: Next: Next: Next

Next: Next: Next: Next: Next: Next

Loop Until True

On Error GoTo 0

End If

If WinTag And Not ShTag Then

MsgBox MSGONL YONE, vbInformation, HEADER

Exit Sub

End If

On Error Resume Next

For Each w1 In Worksheets

'Attempt clearance with PWord1

w1.Unprotect PWord1

Next w1

On Error GoTo 0

ShTag = False

For Each w1 In Worksheets

'Checks for all clear ShTag triggered to 1 if not.

ShTag = ShTag Or w1.ProtectContents

Next w1

If ShTag Then

For Each w1 In Worksheets

With w1

If .ProtectContents Then

On Error Resume Next

Do 'Dummy do loop

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

.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 Not .ProtectContents Then

PWord1 = Chr(i) & Chr(j) & Chr(k) & Chr(l) & _

Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _

Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)

MsgBox Application.Substitute(MSGPWORDFOUND2, _

"$$", PWord1), vbInformation, HEADER

'leverage finding Pword by trying on other sheets

For Each w2 In Worksheets

w2.Unprotect PWord1

Next w2

Exit Do 'Bypass all for...nexts

End If

Next: Next: Next: Next: Next: Next

Next: Next: Next: Next: Next: Next

Loop Until True

On Error GoTo 0

End If

End With

Next w1

End If

MsgBox ALLCLEAR & AUTHORS & VERSION & REPBACK, vbInformation, HEADER End Sub

穷举破解 EXCEL 、WORD 文档密码

摘要：本文讨论了如何使用VB 编程，通过穷举法解除EXCEL 文档和WORD 文档的密码。并在破解过程

中加入了中断，以方便用户随时中断破解过程。

关键字：穷举法、解密、EXCEL 文档、 WORD 文档、密码

Excel 和 Word 提供了多种方法限制访问用户文档，以免未经授权者的查看和更改。但在信息化的今天，用

户需要记忆的密码太多，一旦密码丢失，用户将无法打开或访问该文档，给用户造成很大的损失。能否借助

计算机的高速运行，解开密码呢？通过尝试，笔者认为：在无法弄清 Excel 和 Word 加密算法的情况下，利用穷举法

尝试解密文档，是解密唯一的选择。

1. 实现原理

本程序选用VB6.0 编写，并充分利用了Office 组件中的对象库，穷举尝试各种口令，达到解密文档的目的。

⑴ 巧用整数的取整及取余，产生密码字符串

Excel 和Word 文档密码可以是字母、数字、空格以及符号的任意组合，最长可达15 个字符，且区分大小

写。

本程序的破解过程利用一个两层循环，产生选定字符的排列组合（尝试密码），其中外层循环控制密码的位

数，内层循环生成N 位密码的所有排列组合。产生尝试密码的方法是：将一个N 位字符串密码（password ）作为一个“数值”，该“数值”每个位上的“数字”属于选定字符范围，且该“数值”与一个整数（X ）一一对应，并

满足以下条件：0 ≤X ≤ArrayLenN -1 （ ArrayLen 是选定密码字符范围的总字符数，如：仅选定数字时，ArrayLen=10 ；仅选定数字和小写字母时，ArrayLen=10+26=36 ）；对X 整除、取余N-1 次，对每次的余

数 Y 做以下操作：password = password + CharArray(Y) （注：CharArray 是存放选定字符的一维数组），

最后做以下操作：password = CharArray(X MOD ArrayLen) + password ，产生的password 就是整数X 对应的 N 位字符串。

⑵利用 VB 的错误处理功能，尝试口令破解

当运行程序尝试一个密码时（用该密码打开文档），若密码错误，则会产生运行错误。为此，必须在尝试口

令前，使用On Error语句打开一个错误处理程序；由于本程序是尝试各种口令，当一个口令错误时，直接

尝试下一个口令即可，因此，应使用“On Error Resume Next ”语句。

那么，如何得知找到口令了呢？VB 有一个内部错误对象Err ，它的Number 属性中的值是用来确定发生

错误的原因。在尝试一个口令后，检查Err.Number中的值，以确定该口令是否正确。

⑶ 破解过程中的中断

利用穷举法解密对系统资源的占用是十分惊人的，在解密的过程中CPU 的利用率几乎是100% ，若不加入

解密过程中的中断，计算机系统会处于一种假死机状态。为此，在破解过程的内循环中加入了DoEvents 函数。 DoEvents函数提供了一种取消任务的简便方法，它将控制切换到操作环境内核。只要此环境中的所有

应用程序都有机会响应待处理事件，应用程序就又恢复控制。使用该函数的优点是：不会使应用程序放弃焦

点，且后台事件能够得到有效处理。

2.具体实现过程

编程实现时，需要机器安装有VB 应用程序及Microsoft Office组件。

⑴新建 VB 工程，并对其初始化

新建一个VB 工程，取名 Get_Password ，将启动窗体命名为FrmMain 。首先选择“工程”菜单中的“引用”，在“引用”对话框中选择“ Microsoft Excel10.0 Object Library和

“ Microsoft”Word10.0 Object Library（注意”：如

果安装的是Office2000或Office97，应该选择Excel 对象库和Word 对象库的 9.0 版或 8.0 版）。其次在“工

程”菜单中“部件”对话框中，选择添加“Microsoft Windows common controls-2.5(sp2) ”和“Microsoft Commo n

Dialog control 6.0，以”便在窗体设计中使用微调控件和对话框控件。

⑵在 FrmMain窗体上添加控件

在 FrmMain窗体上，按照下图的位置添加表 1 中的控件，然后根据表 1 修改每个对象的属性。

表 1：

序号控件名称控件属性及其属性值

1 Frame Name=Frame1 ， Caption= 选择加密文件（ *.DOC 、*.XLS ）

2 Frame Name=Frame2 ， Caption= 选定密码字符范围：

3 Frame Name=Frame3 ， Caption= 选择密码的长度：

4 ComboBow Name=Combo1

5 CommandButton Name=CmdBrowse ， Caption= 浏览

6 CommandButton Name=CmdStartCrack ， Caption= 开始破解

7 CommandButton Name=CmdQuit ，Caption= 退出系统

8 CheckBox Name=ChkDigital ， Caption= 数字 (10)

9 CheckBox Name=ChkLowercase ， Caption= 小写字母 (26)

10 CheckBox Name=ChkUppercase ， Caption= 大写字母 (26)

11 CheckBox Name=ChkSpace ，Caption= 空格 (1)

12 CheckBox Name=ChkBracket ， Caption= 括号 (6)

13 CheckBox Name=ChkOthers ， Caption= 其他 OEM 字符 (26)

14 TextBox Name=txtPasswordStartLong ， Text=2

15 TextBox Name=txtPasswordEndLong ，Text=2

16 TextBox Name=Text1

17 UpDown Name=UpDown1 ，BuddyProperty=Text ， Wrap=TRUE ， Increment=1

BuddyControl=txtPasswordStartLong ， Max=15 ， Min=

18 UpDown Name=UpDown2 ，BuddyProperty=Text ， Wrap=TRUE ， Increment=1

BuddyControl=txtPasswordEndLong ， Max=15 ， Min=1

19 CommonDialog Name=Dialog ， DialogTitle= 请选择加密的 Excel 或 Word 文档

Filter=Excel(*.xls)，Word(*.doc)|*.xls;*.doc

20 Label Name=Label1 ， Caption= 破解进度：

21 Label Name=Label3 ， Caption= 从：

22 Label Name=Label5 ， Caption= 到：

⑶ 为以上对象编写下列代码

为了便于理解，程序中增加了适当的注释。

Option Explicit

Private Sub CmdBrowse_Click()

Dialog.ShowOpen 'show the dialog

Combo1.Text = Dialog.FileName'set the Filename text box to the selected file Combo1.Refresh

End Sub

Private Sub CmdQuit_Click()

End

End Sub

Private Sub CmdStartCrack_Click()

Static blnProcessing As Boolean

Dim wd As New Word.Application, xls As New Excel.Application

Dim OpenReturn

Dim strpath, pass, StrTemp, all_char(100) As String

Dim J, K, Password_Start_Long, Password_End_Long, ArrayLen As Integer

Dim I, Temp As Long

ArrayLen = 0'数组初始化

If ChkDigital.Value = 1The n

For J = ArrayLen To ArrayLen + 9

all_char(J) = Chr(Asc("0") + J - ArrayLen) Next J

ArrayLen = ArrayLen + 10

End If

If ChkLowercase.Value = 1The n

For J = ArrayLen To ArrayLen + 25

all_char(J) = Chr(Asc("a") + J - ArrayLen) Next J

ArrayLen = ArrayLen + 26

End If

If ChkUppercase.Value = 1 Then

For J = ArrayLen To ArrayLen + 25

all_char(J) = Chr(Asc("A") + J - ArrayLen) Next J

ArrayLen = ArrayLen + 26

End If

If ChkSpace.Value = 1 Then

all_char(ArrayLen) = " "

ArrayLen = ArrayLen + 1

End If

If ChkBracket.Value = 1 Then

all_char(ArrayLen) = "("

all_char(ArrayLen+1) = ")"

all_char(ArrayLen+2) = "{"

all_char(ArrayLen+3) = "}"

all_char(ArrayLen+4) = "["

all_char(ArrayLen+5) = "]"

ArrayLen = ArrayLen + 6

End If

If ChkOthers.Value = 1 Then

For J = ArrayLen To ArrayLen + 6 '33 to 39 all_char(J) = Chr(33 + J - ArrayLen)

Next

ArrayLen = ArrayLen + 7

For J = ArrayLen To ArrayLen + 5 '42 to 47 all_char(J) = Chr(42 + J - ArrayLen)

Next J

ArrayLen = ArrayLen + 6

For J = ArrayLen To ArrayLen + 6 '58 to 64 all_char(J) = Chr(58 + J - ArrayLen)

Next J

ArrayLen = ArrayLen + 7

all_char(ArrayLen) = Chr(92)

ArrayLen = ArrayLen + 1

For J = ArrayLen To ArrayLen + 2'94 to 96

all_char(J) = Chr(94 + J - ArrayLen)

Next J

ArrayLen = ArrayLen + 3

all_char(ArrayLen) = Chr(124)

all_char(ArrayLen+1) = Chr(126)

ArrayLen = ArrayLen + 2

End If

If ArrayLen = 0 Then

MsgBox " 错误：没有选择'密码使用的字符'", , " 请选择密码使用的字符范围..."

Exit Sub

End If

If blnProcessing Then

If MsgBox(" 真的要中断解密过程吗？", vbYesNo, "用户中断任务 ") = vbYes Then blnProcessing = False

Else

CmdStartCrack.Caption = "中断破解"

blnProcessing = True

strpath = Combo1.Text

If strpath = "" Then

MsgBox " 错误：没有选择'需要解密的文件 '", , " 请选择需要解密的文件..."

Exit Sub

End If

strpath = Trim(strpath)

Password_Start_Long = Val(txtPasswordStartLong.Text)

Password_End_Long = Val(txtPasswordEndLong.Text)

If Password_Start_Long > Password_End_Long Then

Password_Start_Long = Val(txtPasswordEndLong.Text)

Password_End_Long = Val(txtPasswordStartLong.Text)

End If

Label1.Caption = "破解进度："

Label1.Refresh

On Error Resume Next

If UCase(Right(strpath, 3)) = "XLS" Then

For K = Password_Start_Long To Password_End_Long '破解excel 开始For I = 0 To ArrayLen ^ K - 1

pass = ""

Temp = I

For J = 1 To K - 1

Temp = Temp \ ArrayLe

pass = all_char(Temp Mod ArrayLen) + pass

Next J

pass = pass + all_char(I Mod ArrayLen)

Set OpenReturn = xls.Workbooks.Open(FileName:=strpath, Password:=pass) Text1.Text = pass'显示破解进度

Text1.Refresh

If Err.Number <> 0 Then'如果解密成功 , 打开文档 ,显示密码 ,退出过程Err.Clear

Else

Label1.Caption = "文档密码："

Text1.Text = pass

Me.Refresh

xls.Visible = True

CmdStartCrack.MousePointer = 0

CmdStartCrack.Caption = "开始破解"

blnProcessing = False

Set xls = Nothing

Exit Sub

End If

DoEvents

If Not blnProcessing Then Exit For

Next I

If Not blnProcessing Then Exit For

Next K

xls.Quit

Set xls = Nothing

Else

For K = Password_Start_Long To Password_End_Long '破解word 开始For I = 0 To ArrayLen ^ K - 1

pass = ""

Temp = I

For J = 1 To K -

Temp = Temp \ ArrayLen

pass = all_char(Temp Mod ArrayLen) + pass

Next J

pass = pass + all_char(I Mod ArrayLen)

OpenReturn = wd.Documents.Open(FileName:=strpath, passworddocument:=pass) Text1.Text = pass'显示破解进度

Text1.Refresh

If Err.Number <> 0 Then'如果解密成功,打开文档 ,显示密码 ,退出过程Err.Clear

Else

'MsgBox "word password"

Label1.Caption = "文档密码："

Text1.Text = pass

Me.Refresh

wd.Visible = True

CmdStartCrack.MousePointer = 0

CmdStartCrack.Caption = "开始破解"

blnProcessing = False

Set wd = Nothing

Exit Sub

End If

DoEvents

If Not blnProcessing Then Exit For

Next I

If Not blnProcessing Then Exit For

Next K

wd.Quit

Set wd = Nothing

End If

CmdStartCrack.Caption = "开始破解"

If blnProcessing Then MsgBox "没有找到密码，可能是密码位数不对!", , " 提示信息 ..."

blnProcessing = False

End Sub

3. 时间复杂度分析

一个算法的时间复杂度，是指该算法的时间耗费，是该算法所求解问题规模 n 的函数。根据前面讲的实现原

理，我们知道，破解算法的时间耗费主要集中在尝试打开OFFICE 文档上，因此，当我们假设破解一个N 位字符串密码，且选定密码字符范围的总字符数为ArrayLen 时，该算法的时间复杂度是O(ArrayLen^N) 。即，当 N 确定后，该算法的时间复杂度是N 次方阶；当 ArrayLen 确定后，该算法的时间复杂度是指数阶。

都是高数量级的时间复杂度。

4. 说明

穷举法解密对系统资源的占用是十分惊人的，在解密的过程中最好不要运行其他应用程序。如果安装有瑞星等杀毒软件，应将杀毒软件的“office安全助手”去掉，以便加快程序的运行速度。

该程序在 WinXP+OfficeXP+VB6.0 环境下测试通过，笔者随便测试了一个 5 位数字密码，在 P4 机器上， 8 分钟左右即可解开口令。

表格说明（使用时删除）：

1、该表格主要用途包含不局限于学校、公司企业、事业单位、政府机构，主要针对

对象为白领、学生、教师、律师、公务员、医生、工厂办公人员、单位行政人员等。

2、表格应当根据时机用途及需要进行适当的调整，该表格作为使用模板参考使用。

3、表格的行列、文字叙述、表头、表尾均应当根据实际情况进行修改。

《合同条件》是根据《中华人民共和国合同法》，对双方权利义务作出的约定，除双方协商同意对其中的某些条款作出修改、补充或取消外，都必须严格履行。

《协议条款》是按《合同条件》的顺序拟定的，主要是为《合同条件》的修改、补充提供

一个协议的格式。双方针对工实际情况，把对《合同条件》的修改、补充和对某些条款不

予采用的一致意见按《协议条款》的格式形成协议。《合同条件》和《协议条款》是双方统一意愿的体现，成为合同文件的组成部分。