How to crack an MD5(base64_encode(md5)) password?

[Kay_Z420]

<file path to hashcat.exe> >hashcat.exe -a 3 -m 0 <file path to hash file> ?d?d?d?d?d?d?d?d

only use as many "d's" as needed for length of possible password
d represents digits as in 0123456789

use main wiki for cheat sheet for flags ex (-a flag is --attack mode followed by #3 means brute force

https://hashcat.net/wiki/doku.php?id=hashcat