Can't crack salted hash generated by ruby AuthlogicSha512 library

[Dzam]

Hello.

The code to generate it is quite simple:

Code:

[23] pry(main)> Devise::Encryptable::Encryptors::AuthlogicSha512.digest("12345", 20, "y9KxS8uhhfRZErYBb2mA", nil)

=> "2671d2e63de53eX3X2cc38X06fe8d664717Xe7d1afbcf0ebfbd3dbced3541ced7e00c98X0ad78f3fXeff6df26f2bbb1X3e4cae08fb98fc13b72e3Xd7d2c0Xd29"

Hash was obfuscated with "X", as demanded by rules.
This is a SHA512 algorithm, so I tried hashcat like this:

Code:

[code]hashcat -m 1710 "2671d2e63de53eX3X2cc38X06fe8d664717Xe7d1afbcf0ebfbd3dbced3541ced7e00c98X0ad78f3fXeff6df26f2bbb1X3e4cae08fb98fc13b72e3Xd7d2c0Xd29:y9KxS8uhhfRZErYBb2mA"

12345[/code]

But the cracking status is "Exhausted" and 

Code:

hashcat -m 1710 --show "2671d2e63de53eX3X2cc38X06fe8d664717Xe7d1afbcf0ebfbd3dbced3541ced7e00c98X0ad78f3fXeff6df26f2bbb1X3e4cae08fb98fc13b72e3Xd7d2c0Xd29:y9KxS8uhhfRZErYBb2mA"

just show me nothing.
I guess something wrong with salt format, but I couldn't get what was wrong.