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zip password cracker
Home ยป How to Easily Create a zip password cracker in Just Seconds!

How to Easily Create a zip password cracker in Just Seconds!

    Introduction to zip password cracker

    If you’ve ever forgotten a password for a zip file, you know how frustrating it can be.
    There’s no need to worry anymore, because in this article we’ll show you how to crack a zip password using a dictionary attack.
    Usually zip files are protected with very simple passwords.
    With a dictionary attack, you can use a list of common passwords to try and guess the password for a zip file. This is a very effective method, and it’s easy to do. So let’s get started to code our zip password cracker!

    Prerequisites

    In order to complete the project you just need:

    You don’t need nothing more, so we can start with the code.

    The code

    Imports:

    from optparse import OptionParser
    import pyzipper
    from progress.bar import Bar

    Auxiliary methods

    def get_wordlist(wordlist_file):
        with open(wordlist_file, 'r') as f:
            return f.read().split('\n')

    The first method gets the wordlist from a file and saves it into a file (if the list is too big, think to use a generator).

    def extract(file_name):
    
        with pyzipper.AESZipFile(file_name, 'r') as f:
            f.extractall(pwd = bytes(p, 'utf-8'))

    This is the method that extracts the file.

    The main method

    if __name__ == "__main__":
    
    
    
        parser = OptionParser()
        parser.add_option("-f", "--file", dest="filename",
                            help="compressed file", metavar="FILE")
        parser.add_option("-w", "--wordlist", dest="wordlist", 
                            help="Select the wordlist", metavar="WORDLIST")
    
        (options, args) = parser.parse_args()
        print(options.wordlist)
        for p in Bar('Processing').iter(get_wordlist(options.wordlist)):
            try:
                extract(options.filename)
                print(f"\n[+] Password found: {p}")
                break
            except RuntimeError as e:
                pass

    The first part is just an argument’s parsing, easy to understand.
    The extract generates an Exception in case of failure, so into the for loop we try the extract until it doesn’t throw the RuntimeException.

    How to launch zip password cracker

    Let see the complete code:

    from optparse import OptionParser
    import pyzipper
    from progress.bar import Bar
    
    def get_wordlist(wordlist_file):
        with open(wordlist_file, 'r') as f:
            return f.read().split('\n')
    
    
    def extract(file_name):
    
        with pyzipper.AESZipFile(file_name, 'r') as f:
            f.extractall(pwd = bytes(p, 'utf-8'))       
    
    if __name__ == "__main__":
    
        parser = OptionParser()
        parser.add_option("-f", "--file", dest="filename",
                            help="compressed file", metavar="FILE")
        parser.add_option("-w", "--wordlist", dest="wordlist", 
                            help="Select the wordlist", metavar="WORDLIST")
    
        (options, args) = parser.parse_args()
        print(options.wordlist)
        for p in Bar('Processing').iter(get_wordlist(options.wordlist)):
            try:
                extract(options.filename)
                print(f"\n[+] Password found: {p}")
                break
            except RuntimeError as e:
                pass
    

    After saving our script in a file called main.py we can launch it with the following command:

    python3 main.py -f test.zip -w wordlist.dic

    The output will be something similar to this:

    Processing |########################        | 21168/27608
    [+] Password found: roland

    Conclusion and improvements

    With this project, you can see how easy is an attack on a zip password-protected file, so try to use most secure ones for your important files.

    You can also try to make some improvements, you could add numbers to the ends, or maybe you can merge words from two files.

    Further readings

    If you liked to write the zip password cracker in python, you may want to read those articles: