crack hash with dictionary from C rand()

[peduncle]

I have some md5 hashes of passwords created from C rand() function (as following example)

void create_pass( char* randomString )
{
    sizet_t i = 0;
    size_t length = 28;

    srand(32BIT_SEED);
    strcpy(randomString,"");

    for( i = 0; i < (length/2); i++ )
    {
        *(randomString + i) = ( rand() % 25 + 65 );
    }
    for( ; i < length; i++ )
    {
        *(randomString + i) = ( rand() % 9 + 48 );
    }
}

I can reproduce the same char sequence with the correct srand seed( 32bit int), so i want to brute force the seed by generating all 28 char sequence as dict and crack the md5 hash with hashcat.

But the whole dictionary is huge ( about hundreds of gigabytes), is there any more efficient way? Thanks for help.