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I am trying to create a variable length word list with crunch that guarantees a exclamation point (!) at the end of each word. I want a wordlist of all words of length 4 - 6, with the last character being an exclamation point and the rest being lower case letters. I'm then going to feed all of this into hashcat.

What command/crunch options would I use?

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I'm fairly sure you can not create a word-list of variable word length and a fixed terminating character. Be sure to denote a specific word library if you have one, I'm using the default in these examples.

You have two options:

  1. Run Crunch 3 separate times, once for each word-length (in total) 4 alpha with an appended '!', 5 alphas with an appended '!', etc... Also note, you need to make sure you escape the exclamation with a backslash. You can also establish parameters on the word-list file size, or number of words compiled.

    ./crunch 5 5 -t @@@@/! -o filename.txt
    ./crunch 6 6 -t @@@@@/! -o filename.txt
    ./crunch 7 7 -t @@@@@@/! -o filename.txt
    

    Note the above word-lengths 5, 6 and 7. This corresponds to a word containing 4, 5 or 6 alphabetical characters, with an additional fixed special '!' character. The commands ./crunch 4 6 and/or ./crunch 3 5 will not create words of correct length.

  2. Run one instance of Crunch to generate only the nonfixed characters,

    ./crunch 4 6 -o filename.txt
    

    Write a basic script to retroactively append the '!',

  • Thank you, very helpful. Good idea to run three separate instances. – corneria Jan 29 '17 at 23:42
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Adding to the previous answer. I think you can issue the following command:

./crunch 3 5 -f /usr/share/rainbowcrack/charset.txt loweralpha -o filename.txt

And then you run a bash script to append an exclamation mark at the end. I'm not all that good at bash scripting but:

#!/bin/bash
touch new-file.txt;
for line in $(cat filename.txt);do echo $line! >> new-file.txt;done

This will give you passwords (all lower case) between the length of 4-6 and ending with an exclamation mark.

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