After seeing how to compile John the Ripper to use all your computer's processors now we can use it for some tasks that may be useful to digital forensic investigators: getting around passwords. Today we will focus on cracking passwords for ZIP and RAR archive files. Luckily, the JtR community has done most of the hard work for us. For this to work you need to have built the community version of John the Ripper since it has extra utilities for ZIP and RAR files.
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For this exercise I have created password protected RAR and ZIP files, that each contain two files.
The password for the rar file is 'test1234' and the password for the zip file is 'test4321'.
John the Ripper is a free and open source software. It is a dictionary-based free password cracking tool that attempts to crack plaintext ciphers in the case of knowing the ciphertext, it fully supports the most current encryption algorithms such as DES, MD4, MD5, etc. Simply speaking, it is a brute force password cracking.
- BitCracker is a mono-GPU password cracking tool for memory units encrypted with the password authentication mode of BitLocker (see picture below). Our attack has been tested on several memory units encrypted with BitLocker running on Windows 7, Window 8.1 and Windows 10 (both compatible and non-compatible mode).
- Nov 02, 2020 John The Ripper GPU support on windows? Posted by u/deleted 7 years ago. John The Ripper GPU support on windows? I have started playing with.
In the 'run' folder of John the Ripper community version (I am using John-1.7.9-jumbo-7), there are two programs called 'zip2john' and 'rar2john'. Run them against their respective file types to extract the password hashes:
This will give you files that contain the password hashes to be cracked... something like this:
After, that you can run John the Ripper directly on the password hash files:
You should get a message like:
Loaded 1 password hash (PKZIP [32/64]). By using John with no options it will use its default order of cracking modes. See the examples page for more information on modes.
Notice, in this case we are not using explicit dictionaries. You could potentially speed the cracking process up if you have an idea what the password may be. If you look at your processor usage, if only one is maxed out, then you did not enable OpenMP when building. If you have a multi-processor system, it will greatly speed up the cracking process.
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Now sit back and wait for the cracking to finish. On a 64bit quad-core i7 system, without using GPU, and while doing some other CPU-intensive tasks, the password was cracked in 6.5 hours.
Now if you want to see the cracked passwords give john the following arguments:
John The Ripper Password CrackerIt should output something like:
Note: the hash file should have the same type of hashes. For example, we cannot put the rar AND zip hashes in the same file. But this means you could try to crack more than one zip/rar file at a time.
For the rar file it did not take nearly as long since the password was relatively common. If you take a look at john.conf in the run directory, it has a list of the patterns it checks (in order). The pattern 12345 is much more likely than 54321, so it is checked first resulting in a quick crack.
What is password cracking?
Password cracking process involves recovering a password from storage locations or from data, transmitted by a computer system on network. Password cracking term refers to group of techniques used to get password from a data system.
Purpose and reason of password cracking includes gaining an unauthorized access to a computer system or it can be recovery of forgotten password. There might be another reason of using password cracking technique that is for testing password strength so hacker could not hack into system.
Password cracking is normally performed thought repetitive process in which computer applies different combinations of password till the exact match.Brute Force Password Cracking:
Term brute force password cracking may also be referred as brute force attack. Brute force password cracking is respective process of guessing password, in this process software or tool creates a large number of password combinations. Basically it’s a trail-and-error technique used by software to obtain password information from system.
A brute force attack are normally used by hackers when there is no chance of taking advantage of encrypted system weakness or by security analysis experts to test an organization’s network security .This method of password cracking is very fast for short length passwords but for long length passwords dictionary attack technique is normally used.
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Time taken by brute force password cracking software to crack password is normally depend upon speed of system and internet connection.GPU Password Cracking:
GPU is graphics processing unit, sometimes also called visual processing unit. Before talking about GPU password cracking we must have some understanding about hashes. When user enter password the password information stored in form of computer hashes using the one-way hashing algorithm.
In this password cracking technique using GPU software take a password guess and look through hashing algorithm and compare it or match it with the existing hashes till the exact match.
GPU can perform mathematical functions in parallel as GPU have hundreds of core that gives massive advantage in cracking password. GPU is much faster than CPU so that’s the reason of using GPU instead of CPU.CUDA Password Cracking:
CUDA Compute Unified Device Architecture is a model for programming and a platform that perform computations in parallel, created by NVIDIA for graphic processing.
CUDA Password cracking includes cracking passwords using Graphics card which have GPU chip, GPU can perform mathematical functions in parallel so the speed of cracking password is faster than CPU.GPU have many 32bit chips on it that perform this operation very quickly.
We can easily access CUDA through libraries, directives and with the help of different programming languages that includes C, C++ and FORTRAN.Password Cracking Tools
Given below is the list of Top10 Password cracking tools.
1. Cain and Abel : Top password cracking tool for Windows
Cain & Abel is one of the top cracking tool for password cracking and password recovery for Windows OS.
Cain & Abel can use techniques of Dictionary Attack, Brute-Force and Cryptanalysis attacks to crack encrypted passwords. So it only uses the weakness of system to crack password. GUI Interface of software is very simple and easy to use. But have availability limitation, tool only available for window based systems .Cain & Abel tool have many good features some of the features of tool are discussed below:Features of Cain & Abel:
- Used for WEP (Wired Equivalent Privacy) cracking
- Have ability to record conversation over IP
- Cab be used as Network Password Sniffer
- Ability to resolve addresses IP to MAC.
- Can crack verity of hashes including LM and NT hashes, IOS and PIX hashes, RADIUS hashes, RDP passwords, and lots more than that.
2. John the Ripper : Multi-platform, Powerful, Flexible password cracking tool
John the Ripper is a free multi or cross platform password cracking software. Its called multi platform as it combines different password cracking features into one package.
It’s primarily used to crack weak UNIX passwords but also available for Linux, Mac, and Windows. We can run this software against different password encryptions including many password hashes normally found in different UNIX versions. These hashes are DES, LM hash of Windows NT/2000/XP/2003, MD5, and AFS.Features of John the Ripper
- Supportive with Brute force password cracking and dictionary attacks
- Multi platform
- Available free for use
- Pro version is also available with additional features
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3. Aircrack : Fast and effective WEP/WPA cracking tool
Aircrack is a combination different tools used for Wifi, WEP and WPA passwords cracking. With the help of these tools you can crack WEP/WPA passwords easily and effectively
Brute force, FMS attack, and dictionary attacks techniques can be used to crack WEP/WPA passwords. Basically it collects and analyzes encrypted packets then using its different tool crack password out of the packets. Although aircrack is available for Windows but there are different issues with this software if we use this in Windows environment, so it’s best when we use it in Linux environment.Features of Aircrack
- Supportive with both Brute force and dictionary attacks cracking techniques
- Available for Windows and Linux
- Available in live CD
4. THC Hydra : Multiple services supportive, Network authentication cracker
THC Hydra is a supper fast network password cracking tool. It uses network to crack remote systems passwords.
It can be used to crack passwords of different protocols including HTTPS, HTTP, FTP, SMTP, Cisco, CVS, SQL, SMTP etc. It will give you option that you may supply a dictionary file that contains list of possible passwords. It’s best when we use it in Linux environment.Features of THC Hydra
- Fast cracking speed
- Available for Windows, Linux ,Solaris and OS X
- New modules can be added easily to enhance features
- Supportive with Brute force and dictionary attacks
Site for Download:https://www.thc.org/thc-hydra/
5. RainbowCrack : New Innovation in Password Hash Cracker
RainbowCrack software uses rainbow tables to crack hashes, in other words we can say it uses process of a large-scale time-memory trade for effective and fast password cracking.
Large-scale-time-memory-trade-off is a process of computing all hashes and plain text using a selected hash algorithm. After calculations, obtained results are stored in the tables called rainbow table. Process of creating rainbow tables is very time consuming but when its done software works very fast.
Password cracking using rainbow table is faster than the normal brute force attack method. It’s available for Linux and Windows operating system.Features of Rainbow Crack
- Support verity of Rainbow tables
- Runs on Windows (XP/Vista/7/8) and Linux operating systems (x86 and x86_64)
- Simple in use
Site for Download:
6. OphCrack : Tool for Windows password cracking
OphCrack used to crack Windows user passwords with the help of rainbow tables that are available in a bootable CD.
Ophcrack is completely free to download, Windows based password cracker that uses rainbow tables to crack Windows user passwords. It normally cracks LM and NTLM hashes. Software has simple GUI and can runs on different platforms.Features of OphCrack
- Available for Windows but also available for Linux, Mac, Unix, and OS X
- Uses for LM hashes of Windows and NTLM hashes of Windows vista.
- Rainbow tables available free and easily for Windows
- To simplify the process of cracking Live CD is available
Site for Download:http://ophcrack.sourceforge.net/
7. Brutus : A brute force attack cracker for remote systems
Brutus is the fastest, most flexible, and most popular software used to crack remote system passwords. It guess password through applying different permutations or by using a dictionary.
It can be used for different network protocols including HTTP, FTP, IMAP, NNTP and other types such as SMB, Telnet etc. It also gives you facility of creating your own authentication type. It also includes extra options of load and resume, so process can be paused when required and you can resume process when you want.
It is only available for windows operation systems. Tool has a limitation that it has not been updated since 2000.
Features of Brutus
- Available for Windows
- Can be used with different network protocols
- Tool have many good extra features
- Support SOCK proxy for all types of authentications
- Capability of error handling and recovery
- Authentication engine is multi stage
Site for Download:
8. L0phtCrack : Smart tool for Windows password recovery
Just like OphCrack tool L0phtCrack is also a Windows passwords recovery tool uses hashes to crack passwords, with extra features of Brute force and dictionary attacks.
It normally gains access to these hashes from directories, network servers, or domain controllers. It is capable of doing hash extraction from 32 & 64 bit Windows systems, multiprocessor algorithms, scheduling, and can also perform decoding and monitoring networks. Yet it is still the easiest to use password auditing and recovery software available.
Features of L0phtCrack
- Available for Windows XP, NT, 2000, Server 2003,and Server 2008
- Can work in both 32- and 64-bit environments
- Extra feature of schedule routine auditing on daily, weekly, monthly bases
- After run it provide complete Audit Summary in report page
Site for Download:
9. Pwdump : Password recovery tool for Windows
Pwdump is actually different Windows programs that are used to provide LM and NTML hashes of system user accounts.
Pwdump password cracker is capable of extracting LM, NTLM and LanMan hashes from the target in Windows, in case if Syskey is disabled, software has the ability to extract in this condition.
Software is update with extra feature of password histories display if history is available. Extracted data will be available in form that is compatible with L0phtcrack.
Recently software is updated to new version called Fgdump as Pwdump not work fine when any antivirus program is running.
Features of Pwdump
- Available for Windows XP, 2000
- Powerful extra feature are available in new version of Pwdump
- Ability to run multithreaded
- It can perform cachedump (Crashed credentials dump) and pstgdump (Protected storage dump)
Site for Download:
10. Medusa : Speedy network password cracking tool
Medusa is remote systems password cracking tool just like THC Hydra but its stability, and fast login ability prefer him over THC Hydra.
It is speedy brute force, parallel and modular tool. Software can perform Brute force attack against multiple users, hosts, and passwords. It supports many protocols including AFP, HTTP, CVS, IMAP, FTP, SSH, SQL, POP3, Telnet and VNC etc.
Medusa is pthread-based tool, this feature prevent unnecessarily duplicate of information. All modules available as an independent .mod file, so no modification is required to extend the list that supports services for brute forcing attack.
Features of Medusa
- Available for Windows, SunOS, BSD, and Mac OS X
- Capable of performing Thread based parallel testing
- Good feature of Flexible user input
- Due to parallel processing speed of cracking is very fast
Site for Download: