Hacking password protected workbook by VBA Codes

[Niraj Baraili]

Hi Expert,

Can we unlock excel workbook which locked for viewing with VBA Codes ?
If so, can we have the sample code.

Thanks in advance

 

[chirayu]

Do you mean the one that asks for a Password as soon as you open the workbook? So you can only open in read only?

If you mean that, then you'll need a brute force software to hack it.

For worksheet/ vba I think LukeM has posted a thread in the Vault section

 

[Niraj Baraili]

Hi Chirayu,

Thank you very much for the reply.
I just check brute force software, but confused which application to download ?

If you could send me the link it will be great help.

 

[Chihiro]

FYI if it's password encrypted file and is 2007 or later... it will be difficult.
As far as I know, brute force software only support up to 2003.

All versions after 2007 use 128-bit AES.

2007/2010 - Use SHA-1 algorithm and can be brute forced under right circumstances.

In other words, if password is sufficiently lengthy or complex, brute force attempt will likely fail.

2013 - SHA-2/512, don't know of any successful attempt at brute forcing.

Here's interesting read on the subject.
https://en.wikipedia.org/wiki/Microsoft_Office_password_protection

 

[Marc L]

Hi !

Very difficult for password workbook since Excel 2013
(or updated 2010 version).

Just do a research on web as it is a very common subject !
A lot of tools (not free) and for 2013 version,
any tool needs a lot of hours even days …

For companies, Microsoft has developped a primary key system tool
but works only if it was in place before saving the workbook …
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