A python script for guessing zip file passwords.

guess.py

#!/usr/bin/env python3

# Guess a zip file password using a word list.
#
# Copyright 2020, Andrew C. Young <andrew@vaelen.org>
# License: MIT
#
# Usage: guess.py <zip_file> <words_file>
# NOTE: The words file should be a gzip file that contains a list of words separated by spaces or newlines

import subprocess
import sys
import gzip
import zipfile

if len(sys.argv) < 3:
    print("Zip file password guesser")
    print()
    print("Copyright 2020, Andrew C. Young <andrew@vaelen.org>")
    print("License: MIT")
    print()
    print("Usage: guess.py <zip_file> <words_file>")
    print()
    print("NOTE: The words file should be a gzip file that contains a list of words separated by spaces or newlines")
    print()
    exit(1)

filename = sys.argv[1]
words_filename = sys.argv[2]


def try_password(password):
    with zipfile.ZipFile(filename) as zip_file:
        try:
            zip_file.extractall(pwd=password)
        except:
            return False
        return True


words = []
with gzip.open(words_filename, "r") as f:
    for line in f:
        for word in line.split():
            words.append(word)

print(f'Using {len(words)} words')

for word in words:
    print("#", end='', flush=True)
    word_list = [word.title(), word.lower(), word.upper()]
    for pw in word_list:
        if try_password(pw):
            print()
            print(f'Success! Password: {pw.decode("utf-8")}')
            exit(0)

print()
print("Password Not Found")
exit(1)