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Hello

I'm new to hashcat and I wanted to use it to find out a salt, because I know what is hashed and the hash but I missing the salt. How can do it with hashcat? I have to create a file with the hashed text and the hash and then use the brute force attack?

Thanks for the help
It depends on what algorithm was used. Sometimes it's possible to put as input the HashTongueass as if it was Hash:Salt in order to crack the salt.
Thanks for the reply, any way it's not a password, the hash algorithm is md5 and it's used as checksum, for this reason I know the text and its hash but I need to find out the salt.

So I create a file with the hash:text only and then I use the command:

hashcat -m 10 -a 3 mytexthashfile.txt

I suppose that the format is salt.pass, because I try to find the salt I have to use the reverse one, this means pass.salt mode, am I correct?
Moreover I think that the salt is just plain text with no upper case, numbers and special chars, do I have to specify a custom charset?

Thanks
I'm try to figure it out but it don't get it. I have made a test, let's say that the the salt is "md5" and the text is "function", I just create the hash for "md5function" and put it in a test.txt file, then I create a second file with the text "function" and I call it pass.txt.
Now I want to find the "md5" salt and I use the following command:

hashcat -m 10 -a 3 -e pass.txt test.txt ?a?a?a

But it doesn't find it, what is wrong?

Code:
Added hashes from file test.txt: 1 (1 salts)
Activating quick-digest mode for single-hash

NOTE: press enter for status-screen


Input.Mode: Mask (?a) [1]
Index.....: 0/1 (segment), 95 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 95/95 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--


Input.Mode: Mask (?a?a) [2]
Index.....: 0/1 (segment), 9025 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 9025/9025 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--


Input.Mode: Mask (?a?a?a) [3]
Index.....: 0/1 (segment), 857375 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: 13.74M plains, 13.74M words
Progress..: 857375/857375 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--
Code:
~> echo -n md5function | md5sum | sed 's;^\(.\{32\}\).*$;\1:function;' > /tmp/hash
~> ./hashcat-cli64.bin -m 10 -a 3 /tmp/hash "?a?a?a"                              
Initializing hashcat v0.47 by atom with 8 threads and 32mb segment-size...

Added hashes from file /tmp/hash: 1 (1 salts)
Activating quick-digest mode for single-hash with salt

NOTE: press enter for status-screen


Input.Mode: Mask (?a) [1]
Index.....: 0/1 (segment), 95 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 95/95 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--


Input.Mode: Mask (?a?a) [2]
Index.....: 0/1 (segment), 9025 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 9025/9025 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--

190c0b684aefa1ccd96dc2eaeac741d6:function:md5

All hashes have been recovered

Input.Mode: Mask (?a?a?a) [3]
Index.....: 0/1 (segment), 857375 (words), 0 (bytes)
Recovered.: 1/1 hashes, 1/1 salts
Speed/sec.: - plains, - words
Progress..: 760874/857375 (88.74%)
Running...: --:--:--:--
Estimated.: --:--:--:--

Started: Mon Jan 27 11:07:18 2014
Stopped: Mon Jan 27 11:07:18 2014

works for me
Thanks it was using the pass.txt as hash file, now it works:

hashcat-cli64.exe -m 10 -a 3 --salt-file=pass.txt test.txt ?a?a?a

Code:
Initializing hashcat v0.47 by atom with 8 threads and 32mb segment-size...

Added external salts from file pass.txt: 1 salts
Added hashes from file test.txt: 1 (1 salts)
Activating quick-digest mode for single-hash

NOTE: press enter for status-screen


Input.Mode: Mask (?a) [1]
Index.....: 0/1 (segment), 95 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 95/95 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--


Input.Mode: Mask (?a?a) [2]
Index.....: 0/1 (segment), 9025 (words), 0 (bytes)
Recovered.: 0/1 hashes, 0/1 salts
Speed/sec.: - plains, - words
Progress..: 9025/9025 (100.00%)
Running...: --:--:--:--
Estimated.: --:--:--:--

190c0b684aefa1ccd96dc2eaeac741d6:function:md5

All hashes have been recovered

Input.Mode: Mask (?a?a?a) [3]
Index.....: 0/1 (segment), 857375 (words), 0 (bytes)
Recovered.: 1/1 hashes, 1/1 salts
Speed/sec.: - plains, 3.84M words
Progress..: 839096/857375 (97.87%)
Running...: --:--:--:--
Estimated.: --:--:--:--