Cisco IOS MD5 BruteForce Mask

[royce]

Assuming that it's this type of hash:

Code:

$ openssl passwd -1 -salt 0000 -table password
password    $1$0000$aWwcZQIpZ/gD70N/fOUeh0

... then you need to specify the hash type (-m 500 = Cisco-IOS MD5) and the attack type (-a 3 = brute-force), as in:

Code:

./cudaHashcat64.bin -a 3 -m 500 '$1$0000$aWwcZQIpZ/gD70N/fOUeh0'

If you know anything about what the password might contain (character sets and/or position), that's when you use a mask.

Edit to add: It also sounds like you might want to look into using some word lists, instead of rainbow tables.