I actually tried this with one of my CEH classmates. He created a long and complex NTLM password and asked if I could crack it. I had 0phcrack and a set of rainbow tables that was just under 800MB. The problem ends up being that most rainbow tables don't have entries for passwords with spaces in them. So the one I used couldn't do it. So you may need to try a hybrid attack and account for spaces.

You could always use one of the password cracking services out there. You give them a hash, they will eventually crack it. Some services are free other are not. So it may not be worth the time or the money.

Could be fun though.

Don

Most services, even the commercial ones, only have NTLM tables for up to 9 characters max. So basically if you want to use rainbow tables, you're going to have to create your own. I've tried a multitude of available resources and tools. It's an interesting practical exercise that's for sure.