In rainbow tables, there are precomputed tables of word lists, such as dictionary files, brute force lists, hash values, etc. When hackers compromise a system and gain the password hashes with tools like PWdump7, they attempt to crack the hashes and obtain the passwords in plain-text.Īfter finding access to the SAM database dump of a system, the hackers use rainbow tables to recover the plain text password. To start the next lab, copy the hashes.txt file from Desktop and paste it to Z:\CEHv10 Module 06 System Hacking\. It takes 15 to 20 minutes to crack all the password hashes. Ophcrack will start cracking the passwords. Choose the table and click on OK.Ĭlick on Crack in the menu bar. The chosen tables_vista_free is installed as Vista free. This folder is available in the Module 06 System Hacking\Password Cracking Tools\ophcrack. When the Select the directory which contains the tables window comes, choose the tables_vista_free folder. When the Table Selection window comes, choose Vista free and click on Install. Open the PWDUMP file and choose hashes.txt file on the desktop. When the Ophcrack main window comes, click on Load in the menu bar and choose PWDUMP file from the dropdown. In case you see an error like Open File- Security Warning, click on Run. Double-click on ophcrack.exe to open the application. Go to Module 06 System hacking\Password Cracking Tools\ophcrack\x86. While saving the file, choose Desktop as the destination folder. Choose Save As for saving the edited version of the file. In this file, replace the box symbol before every user ID with its User Name.Ĭlick on File from the menu bar. Go to the C:\ drive and open hashes.txt file. Then the file will be saved to C:\ drive. It will write the extracted passwords to a hashes.txt file. It will show the password hashes of the user accounts in the command prompt window.įor writing the password hashes to a file, write PwDump7.exe > c:\hashes.txt and press Enter. Open the Command Prompt and write cd C:\Users\Admin\Desktop\pwdump7. Paste the folder on your Desktop and close the File Explorer. Right-click on the pwdump7 folder and choose Copy from the context menu. Go to the Module 06 System Hacking\Password Cracking Tools. It will show the User Account Names along with the respective IDs. Write wmic useraccount get name,sid in the command prompt and press Enter. In this lab, we will discuss the use of pwdump7 for extracting password hashes, and the use of Ophcrack tool for cracking the passwords and finding plain text passwords. You can also use pwdump7 to dump protected files. It will run with a hash decrypter to find the plaintext passwords. While doing the password assessment, you will start with a simple SAM hash dump. To dump the SAM file content, you should have the admin access to it. It can also allow them to crack passwords, bypass the hash, gain unauthorized access to other systems, analyze passwords, and recognize patterns for compromising other passwords as well. They can use password hashes to carry out various types of attacks on the system. When hackers attack a system, they usually dump the OS password hashes after compromising the target machine. The passwords in this file are saved in hashed format for better security. Security Account Manager (SAM) is a database file which includes user accounts and security descriptors of users.
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