Berkely DB Hash what format?

[devilsadvocate]

I am trying to access my old passwords in a very old vsftp server, that  uses Berkely DB hash to store the usernames and password in a database in the format username:paswhash

any idea how I can procede to brute force this one?

In Ubuntu, "sudo apt-get install db-util"

The "db_dump" command from that package might get you somewhere.  Also, db_dump might already be on the target system.  You will need to locate the .db file, wherever that is.

Also, this is really a forum for hashcat, not methods on getting hashes.  Try Google next time.