Help Desk password hash
I tried tosearch, but found no topics about this hash. Is is possible to use some rules or something else to Help Desk's hashing algoritm? It uses only sha1, but pre-hashing every symbols in password.

PHP Code:
function hesk_Pass2Hash($plaintext) {
   $majorsalt  '';
   $len strlen($plaintext);
   for ($i=0;$i<$len;$i++)
       $majorsalt .= sha1(substr($plaintext,$i,1));
   $corehash sha1($majorsalt);
   return $corehash;

I can convert wordlists to something like pre-rainbow tables, where each line is result of final $majorsalt (name from code example) and then put it to hashcat as wordlist, but it's not so fast...
converting wordlist is the best you can get as far as I'm concerned
Converted wordlist can't work in optimized mode or only up to 6 character passwords in pure mode. The only way to crack this is to write a separate hashcat kernel. Expect raw sha1 performance and divide by 20.