Home / ubuntu / Questions / 1001860
Accepted
frepie
Asked: 2018-02-01 13:18:23 +0800 CST

Script to loop over list of hashes in a file stuck with variable from the first iteration

  • 772

I am currently attending a class on network security and we need to crack hashed passwords. To do so, we use hashcat. Since there are a lot of hashes, I am trying to write a script that would test the hashed password with all the hashes contained in the list. My script is as follows:

 1 #! /bin/bash
  2 listhsh="hashlist.txt"
  3 
  4 
  5 while read file; do
  6         echo $file
  7         hashcat -a 0 -m $file -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
  8 done < $listhsh

the file contains the following values. These are codes defining the type of hash to be tested.

900
0
5100
100
1300
1400
10800
1700
5000
600

The problem I have is that the script opens the file, takes the first line that contains the code for hash type to be tested and runs hashcat with the value in $file=900. However, once the test finishes with the first value, the script executes hashcat with the same value of $file=900. So the end result is hashcat doing the same test with $file=900 as many times as there are values in the list.

scripts command-line bash

2 Answers

  1. Best Answer

    One option could be a for loop. The -m option is for the hashes to be ran. The file is supposed to feed in value and loop each hash type.

    The following changes should help your script. I substituted hash for file. 

    #!/bin/bash
listhsh="hashlist.txt"

for hash in $(cat $listhsh); do
echo $hash
    hashcat -a 0 -m $hash -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
done

    As a test, I ran the line as an echo line to see if it would work:

    ~$ ./hashcat_test 
900
hashcat -a 0 -m 900 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
0
hashcat -a 0 -m 0 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
5100
hashcat -a 0 -m 5100 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
100
hashcat -a 0 -m 100 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
1300
hashcat -a 0 -m 1300 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
1400
hashcat -a 0 -m 1400 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
10800
hashcat -a 0 -m 10800 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
1700
hashcat -a 0 -m 1700 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
5000
hashcat -a 0 -m 5000 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
600
hashcat -a 0 -m 600 -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt

    Hope this helps!

    • 1

  2. You're not quoting your expansions, so they're being evaluated by the shell, which could be problematic. Try this:

    #! /bin/bash
listhsh="hashlist.txt"
while read file; do
    echo "$file"
    hashcat -a 0 -m "$file" -O ~/devoir_PIII_Alice.txt /usr/lib/rockyou.txt
done < $listhsh

    These could be useful:
    https://unix.stackexchange.com/questions/68694/when-is-double-quoting-necessary
    https://www.cyberciti.biz/faq/unix-howto-read-line-by-line-from-file/

    • 0