Excel spreadsheet password cracking using VBA

Question

I tried writing a vba password cracker code similar to the code I used to crack Excel sheet\'s password But I am not sure if I am doing correctly or not - when i tried this code

Answer 1

Maybe of some help?

Option Explicit

Const PWDMaxLength = 9
Const MaxTimeInSeconds = 600    ' 10 Minutes
Const PWDWindowName = "Password"
Const TargetFile = "D:\Dropbox\Excel stuff\crack\test.xls"
Const LowerCase = "abcdefghijklmnopqrstuvwxyzæøå"
Const UpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZÆØÅ"
Const SpesChars = "+-*@#%=?!_;./"
Const Digits = "0123456789"
Dim CrackAttempt As Long
Private Declare Function FindWindow Lib "USER32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetTickCount Lib "kernel32" () As Long


Sub BFOpen()
On Error Resume Next
Application.DisplayAlerts = False
Workbooks.Open Filename:=TargetFile
Application.DisplayAlerts = True
On Error GoTo 0
End Sub


Sub BFCrack()
'On Error Resume Next
Dim lSta, lCur As Long, test, str, PWD As String
lSta = GetTickCount()
PWD = LowerCase & UpperCase & SpesChars & Digits
CrackAttempt = 1
test = InputBox("Insert test string for brutforce if wanted" & vbCrLf & "not more than 5 characters...", "input")
SendKeys "%{TAB}", 100
Do While str <> test Or FindWindow(vbNullString, PWDWindowName) And (Len(str) < PWDMaxLength <> 0 And (lCur / 1000) < MaxTimeInSeconds)
  lCur = (GetTickCount() - lSta)
  If lCur Mod 250 = 0 Then Application.StatusBar = str & " " & CrackAttempt & " " & lCur
  str = GBFS(PWD, CrackAttempt)
  If test = "" Then SendKeys str & "{ENTER}", 1000
  CrackAttempt = CrackAttempt + 1
Loop
Application.StatusBar = False
If str <> "" Then MsgBox str & " found in " & CStr((GetTickCount() - lSta) / 1000) & " seconds after " & CrackAttempt & " attempts", vbOKOnly + vbInformation, "Result"
On Error GoTo 0
End Sub


Function GBFS(ByVal inp As String, ByVal att As Long) As String
  Dim Base, cal As Integer, rmi, res As Long
  Base = Len(inp)
  If Base < 2 Then Exit Function
  rmi = att
  Do While rmi > 0
    res = Int(rmi / Base)
    cal = rmi - (res * Base)
    If cal = 0 Then
      cal = Base
      res = res - 1
    End If
    GBFS = Mid(inp, cal, 1) & GBFS
    rmi = res
  Loop
End Function