13 char hash

While doing some SQL injection I found out that while 80% of the passwords were regular MD5 hashes, the other 20% were 13 char long hashes like this one: bcvx5GEZaU6PQ
Any idea what is it and how to crack it?

It is prob. a random generated password. To hack it you might use Brute force attack, but because the passwords are 13 char long it might take some time.

I used John the Ripper and it worked perfectly (although it took me some time to download it, avg kept deleting it)
thanks for your help

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