Release the hack but with a crypted password.
Crypt the password in base64, atom 128, megan-35 or anything else that's reversible.
Post the method and the order you crypt it like "base64>atom>megan>japoo" and tell them to use
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This will prevent leechers and n00bs to find the password for the hack.
For an example i've got this: " fdOkeg=Led=kR+m1Rub5 " and I crypted it using this method "ATOM-128>Base64>Megan35c" reversing it I get from " fdOkeg=Led=kR+m1Rub5 " the real data which is " 123456 " .