need help with markov chain, or possibly another solution for decrypt of AES-256

[carmitchel]

I have a situation where the HEX key length is 32 bytes, however, these 32 bytes are simply eight repetitions of a 4 byte value (reducing the entropy source to a 32-bit value). This should be an instant brute force crack if I can figure out how I can instruct hashcat to use brute force, but repeat that 4 byte value to total 32 bytes.  I'd love to hear some suggestions.

As an example, some generated keys would look like this:

0100010001000100010001000100010001000100010001000100010001000100
7C687C687C687C687C687C687C687C687C687C687C687C687C687C687C687C68

6810681068106810681068106810681068106810681068106810681068106810