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[guide] How to Crack Windows Login Passwords


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#1 Ultimate John

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Posted 15 April 2007 - 05:15 PM

Whether you need to recover the lost password to a Windows account, you're looking to ensure that your passwords are secure, or you're a super l33t h4x0r, the Ophcrack Live CD is a pretty useful tool.

Ophcrack is a Windows password cracker based on rainbow tables. It comes with Graphical User Interface and runs on Windows, Mac OS X (Intel CPU) as well as on Linux.

After you download and burn the Live CD, the gallery below will walk you through every simple step in the process.


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Restart your computer and reboot from the Ophcrack Live CD. You should see a loading screen like the one above.
I've set up three accounts to test with Ophcrack. One account uses a very simple password, "easypass". The other uses a password created by the Strong Password Generator, and the third is a password over 14 characters long.

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Once Ophcrack finishes booting up (it may seem like it's stuck at first - it's not, so be patient), you'll see a list of all of the accounts on your PC. Click on Launch to get crackin'. The accounts we're concerned with are the ones labeled adam (the simple password), adam-medium (the strong password), and adam-15chars (the over 14 character password). As you can see, the 15-character password doesn't even show up in Ophcrack - meaning that if you want to secure yourself from this specific tool, you'll be totally safe if your password is over 14 characters.

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As Ophcrack starts working, you'll see several strange letter combinations appearing in the LMpasswd1 and LMpasswd2 fields as Ophcrack works its magic.

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After about 5 minutes or so, Ophcrack had cracked adam's simple password, "easypass". I've used Ophcrack on a stronger 13-character alphanumeric password and found it to crack it almost as quickly. So far the strong, generated password remains uncracked.

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After about 30 minutes, Ophcrack had finished its cracking attempts. It had no success cracking the strong password generated for adam-medium by the Strong Password Generator.
Source: LifeHacker

Edited by Ultimate John, 15 April 2007 - 05:17 PM.


#2 FalseAgent

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Posted 16 April 2007 - 01:20 PM

...

#3 _deXter_

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Posted 16 April 2007 - 02:56 PM

Thanks for the review. I didn't know there was a Rainbow-tables based liveCD auditing program out there!

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• You can audit passwords of higher characters and strength by downloading larger tables and burning them onto a DVD.

• If the PC that you're running Ophcrack on isn't fast enough, you can also copy the SAM file (windows\system32\config\SAM) to a faster (or safer ;)) PC and run crack it there.

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As an alternative to recovering the passwords, you can simply blank them out or edit them without wasting any time.

For that purpose, I recommend the Offline NT Password & Registry Editor, which is also another LiveCD based on Linux and only 3 MB in size!

Edited by _deXter_, 16 April 2007 - 03:05 PM.


#4 windowsxp

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Posted 16 April 2007 - 04:09 PM

lol.

#5 timbertide

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Posted 12 May 2007 - 07:26 PM

Thanks for the guide. :D

#6 WhistAler

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Posted 17 May 2007 - 06:54 PM

It may be helpful in the hard times to come.

#7 Freka

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Posted 17 May 2007 - 07:59 PM

Very helpful :D.

#8 Panarchy

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Posted 27 July 2007 - 07:05 AM

Thanks, I have had this CD for a couple of months now... (since march)

Can someone please help me?

ID | Username/LMHash | LMPasswd1
| |
500 | Administrator | SECUREP

There were others, but this is the one I need! Please help! (NTPasswd Not found, and LMpasswd2 .......)

Please help ASAP,

Panarchy

#9 Guest_elektr10_*

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Posted 03 August 2007 - 09:00 PM

Firstly thanks for the useful guide.

I have 2 questions:
1)I sis possible to use that for other windows versions or only xp?
2)The password we need is NTpasswd, right?If so what are LMpasswd1 and LMpasswd2 used for?

#10 ShamusHand

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Posted 04 August 2007 - 02:14 AM

This is a must have CD for a geek gone bad! :devil:

Hax0rs FTW! :P

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