how to use just lower case alpha numeric only?

[azaran]

You were partially right. You just forgot to specify the mask, i.e. "?1?1?1?1?1" for cracking password of 5 lower-case alpha numeric characters.

Your whole command would look like "hashcat64.exe -m 11600 -a 3 -1 ?l?d hast.txt ?1?1?1?1?1".