HELP! SHA 1 512 with hexadecimal
Hi Everyone,
I'm new to hashcat, and I would like to know if it is possible to crack the following situation:

I have a SHA512 hash (I don't know if it is $pass.$salt or $salt.$pass)
I also have the pass, and I know that the salt is 8 bytes long. The salt probably is not a know string, I guess the user picked random bytes instead of a string representation.

Is that possible to do with hashcat-plus?
I could not figure out how to do the custom charset, also when selecting SHA512($pass.$salt) there are no fields to input my know $pass.

Thanks in advance.