Algorithm for algorithm

[viper2420]

I know my plaintext password, salt, and hash that appears to be sha512 (128 hexadecimal characters). However using any of the hashcat built-in algorithms don't give the expected hash.

Is there any systemized/programmatic way (i.e. algorithm) I can go about finding the algorithm without the source code, or is this just guess-and-check/lost cause?

[viper2420]

So it looks like MDXfind is what I was looking for.