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Microsoft Office files can be password-protected in order to prevent tampering and ensure data integrity. But password-protected documents from earlier versions of Office are susceptible to having their hashes extracted with a simple program called office2john. Those extracted hashes can then be cracked using John the Ripper and Hashcat. Extracting the hash from a password-protected Microsoft Office file takes only a few seconds with the office2john tool. While the encryption standard across different Office products fluctuated throughout the years, none of them can stand up to office2john’s hash-stealing abilities.
This tool is written in Python and can be run right from the terminal. To get started, we’ll need to download the tool from GitHub since office2john is not included in the standard version of John the Ripper which should already be installed in your Kali system. This can easily be accomplished with wget.
In order to run office2john with Python , we will need to change into the same directory that it was installed into. For most of you, this will be Home by default just enter cd , but feel free to create a separate directory.
Next, we need an appropriate file to test this on. I am using a simple DOCX file named “dummy. Download it to follow along. The password is “password” as you’ll find out. You can also download documents made with Word and Word that shows up as to use for more examples. Passwords for those are also “password The first thing we need to do is extract the hash of our password-protected Office file.
Run the following command and pipe the output into “hash. To verify that the hash was extracted successfully, use the cat command.
We can see that the hash I saved corresponds to Microsoft Office Like already mentioned, we’ll be showing you two ways to crack the hash you just saved from the password-protected Microsoft Office file. Both methods work great, so it’s really up to preference. Set the –wordlist flag with the location of your favorite word list.
The one that is included with Nmap will do for our purposes here, but for tougher passwords, you may want to go with a more extensive word list. John will start cracking, and depending on the password complexity, will finish when a match is found.
Press almost any key to view the current status. When the hash is cracked, a message will be displayed on-screen with the document’s password: Since our password was pretty simple, it only took seconds to crack it. Now that we know one method of cracking a password-protected Microsoft Office file, let’s look at one other way using the powerful tool Hashcat.
We can begin by displaying the help menu –help for Hashcat. This will provide us with a wealth of information including usage options, hash modes, and other features. There is a ton of information here, so I won’t show the output, but you should dive into it if you really want to know Hashcat. From the output, we’re just interested in the MS Office hash modes.
Near the bottom of the help menu, we will find the MS Office mode options and their corresponding numbers. We know from our hash that this is an Office file, so locate its number ID of After some time has passed, the status will show as cracked, and we are ready to view the password.
Simply cat out the specified output file, and it will show the hash with the plaintext password tacked on the end.
Now we know two methods of cracking the hash after extracting it from a password-protected Microsoft Office file with office2john. When it comes to password cracking of any kind, the best defense technique is to use password best practices. This means using unique passwords that are long and not easily guessable. It helps to utilize a combination of upper and lowercase letters, numbers, and symbols, although recent research has shown that simply using long phrases with high entropy is superior.
Even better are long, randomly generated passwords which makes cracking them nearly impossible. In regards to this specific attack, using Microsoft Office or documents or newer may not be effective, since office2john is designed to work on earlier versions of Office.
However, as you can see above, Office may very well spit out a document without the user even knowing, so it doesn’t mean a “new” file can’t be cracked. Plus, there are still plenty of older Microsoft Office documents floating around out there, and some organizations continue to use these older versions, making this attack still very feasible today. Today, we learned that password-protected Microsoft Office files are not quite as secure as one would be led to believe.
These types of files are still commonly used today, so if you come across one that has a password on it, rest easy knowing that there is a way to crack it. Want to start making money as a white hat hacker? Jump-start your hacking career with our Premium Ethical Hacking Certification Training Bundle from the new Null Byte Shop and get over 60 hours of training from cybersecurity professionals. Hi Sir, I am getting syntax error please help on this.
If you go to the page that’s linked, click on the “Raw” button and then download, or use the exact URL I used with wget in the example. Whether it works in Ubuntu I have an Excel file , tried it in Ubuntu I got error msgs in both the options :. Please help me in cracking the password of my Excel file. Share Your Thoughts Click to share your thoughts. Hot Latest.
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Microsoft Word Crack free download – Microsoft Word, Microsoft PowerPoint , Microsoft Office Professional, and many more programs. Microsoft Office Craông chồng + Activation Key (64/32 Bit) Microsoft Office năm nhâm thìn Crack for Windows differs from the preceding version Each of the essential elements in its applications is oriented to a kind of project, responsive to lớn the hardware phase, & is designed with much more productivity. Mar 14, · Microsoft Office files can be password-protected in order to prevent tampering and ensure data integrity. But password-protected documents from earlier versions of Office are susceptible to having their hashes extracted with a simple program called office2john. Those extracted hashes can then be cracked using John the Ripper and Hashcat.
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