John the ripper pro crack. Also, John is already installed on Kali Linux. It is defined in your john. We had to undertake a password auditor project recently, so one of the key performance indicators was to use a password cracker to check the veracity of the passwords. The goal of this module is to find trivial passwords in a short amount of time. A 1. Then compile the sources: Dec 7, 2023 · John the Ripper (64-bit) John the Ripper 64 bit is a decrypting and decoding utility built to test the strength of the user’s password as well as try to recover lost passwords using several built-in methodologies. John has built-in features to detect what type of hash it is given and to select appropriate rules and formats to crack it for you. Grep that for 'Cracked' to turn those up. Those extracted hashes can then be cracked using John the Ripper and Hashcat. For this purpose, you need to get a ' jumbo' build of John The Ripper, that supports Office files cracking. The weaker the password is, the faster John cracks them. py id_rsa. many flavors of Unix (11 are officially supported, not counting. Check other documentation files for information on customizing the modes. txt. Unmute. 6 Crack the SAM database with john the ripper As the cybersecurity specialist for your company, you're performing a penetration test. The tool is also notable for its ubiquity and accessibility. If needed, convert hashes to formats recognizable by John. 9 How to start password cracking in John the Ripper on a video card. SHA1 is a cryptographically broken encryption cipher that was originall Feb 26, 2024 · Follow the below steps to install John the Ripper on Windows: Step 1: Visit the official website of John the ripper using any web browser. py. Wordlist mode. Dec 29, 2017 · The jumbo version of John the Ripper comes with a Python script called truecrypt2john. different architectures), Windows, DOS, BeOS, and OpenVMS (the latter. (Approx $54 USD). The code for LowerNum looks like this: Jun 25, 2022 · Once you have the location, we're going to take the RSA file we have and convert it to a hash that john the ripper can crack: python /opt/john/ssh2john. In this tutorial, you’ll learn how to utilize John the Ripper to crack passwords for Windows 10, 8, and 7 on your local PC. First, you need to get a copy of your password file. 6) file is provided. This is the simplest cracking mode supported by John. hccap > hash. 3 Implement Physical Security. I installed kali linux, that comes with John the ripper. We'll start by dis Dec 4, 2022 · To do this, open a terminal window and change directories to the location of your word list and hash file. BitCracker is the first open source password cracking tool for storage devices (Hard Disk, USB Pendrive, SD card, etc) encrypted with BitLocker, an encryption feature available on Windows Vista, 7, 8. chr --external=filter_lowernum filter_lowernum is the filter which determines what characters will be in your chr file. Description. john -form=raw-md5 crack. txt John the Ripper's cracking modes. It took around 20 seconds to run that command. 7) Cain/Abel - Free - Has really basic rules (reverse, Double, Case Subs, 2 numbers append, l33t rules) Tools 11 John the Ripper uses an extension of Crack's syntax for the rules. 9. Unshadow is a tool that handles this task and it is part of the John package. 8. 6. Johnny is the cross-platform Open Source GUI frontend for the popular password cracker John the Ripper. txt --format=sha512crypt --wordlist=rockyou. Jul 6, 2020 · Hey guys!!!Many of us secure our files using zip folders and encrypt it using a passwordBut as time goes one people forget their passwords of those zip folde You signed in with another tab or window. Unshadowing is a process where we combine the /etc/passwd file along with the /etc/shadow in order for John to be able to understand what we are feeding to it. External:Filter_LowerNum]), and you can create your own filters there as well. Prepare the Password-Protected ZIP File. Figure 1. 0-jumbo-1 release based off this 1. 1. I first convert the zip into a hash: sudo zip2john FILE_LOCATION > zippedzip. pot file and will not run it again until it has been removed. Reload to refresh your session. The best-known one was 'John the Ripper' so we went ahead and used it. This software is available in two versions such as paid version and free version. Costs Money. , Notes/Domino), and database servers (SQL, LDAP, etc. Crack the root password on Support as follows:From the Favorites bar, open Terminal. 10 How to use John the Ripper on Windows. Instead, after you extract the distribution archive and possibly compile the source code (see below), you may simply enter the "run" directory and invoke John from there. John supports all of the commands of Crack 5. johnpw. Mar 8, 2023 · First released in 1996, John the Ripper (JtR) is a password cracking tool originally produced for UNIX-based systems. Installing John the Ripper. Jan 26, 2017 · How to use John the Ripper for Windows Passwords Cracking In this tutorial, you’ll learn how to utilize John the Ripper to crack passwords for Windows 10, 8, and 7 on your local PC. 网站. Left: John the Ripper Wordlist Mode in action. 9. Type cat License. 1 and 10 (Ultimate, Pro and Enterprise editions). 0-jumbo-1 64-bit Windows and the other is 1. First of all, most likely you do not need to install John the Ripper system-wide. John the Ripper is a tool designed to help systems administrators to find weak (easy to guess or crack through brute force) passwords, and even automatically mail users warning them about it, if it is desired. hashes. Dec 5, 2010 · 12. And then: john --single --format=Raw-MD5 hash7. 4. txt through John the Ripper’s Wordlist Mode: john --wordlist=rockyou --format=raw-sha256 crack. Step 2: There are two options available for windows one is 1. ×. Overview. txt . The input format is a printable hash, which can either be directly created with john's tool “wpapcap2john” (ships with jumbo) from a packet John the Ripper password cracker. Apr 13, 2023 · John the Ripper is an offline password cracking tool that was developed in 1996 by Openwall Project. 13 Configure IP Addresses on Mobile Devices. To install John the Ripper on Windows, follow these steps: Download the ZIP file of John the Ripper from the official website. Both have pros and cons, and in this article I've been playing with John The Ripper (JtR) to try to crack/audit a salted password that was hashed with SHA-512, with 20 interactions according to the source (for the curious, this is a Rails app, with the authlogic gem). En este video aprenderás cómo realizar cracking a archivos PDF y ZIP protegidos por contraseña usando de john the ripper. Given what john is meant for, it is highly unusual that it would used on a file that contains multiple hash types. 7, Johnny – GUI for John the Ripper. It is written in C and can be used as a command-line, GUI, or as a library for writing custom scripts. pot then running the same hash again. Then crack like normal with JTR: $ . John the Ripper is a popular password cracker that is capable of brute-force using both the CPU and the video card and supports many algorithms. If I understood things correctly, JtR expects its hashes in a file, where each hash follows certain format. 它是最常用的密码测试和破解程序之一 [4] [5] ，因为它 Feb 8, 2020 · john --pot=YOUR. Mode descriptions here are short and only cover the basic things. It was originally proposed and designed by Shinnok in draft, version 1. By Google I was suggested to use openssl2john but it fails with error: file1. Metasploit actually contains a little-known module version of JTR that can be used to quickly crack weak passwords, so let's explore it in an attempt to save precious time and effort. log will note the account(s) that have been cracked, with a timestamp. Para “crackear” un archivo RAR protegido por contraseña, se puede utilizar la versión de John the ripper mejorada por la comunidad, conocida como la versión “Jumbo”, en ella usted encontrará una cantidad importante de utilidades adicionales, entre ellas encontrará la utilidad rar2john, la cual será de gran utilidad para este proceso. Sep 21, 2020 · . Extract the contents of the ZIP file to a folder on your computer. The syntax for multiple md5 hashes is as so: john [file 1] [file 2] Copy. John the Ripper 1. This tool was initially released in the year 1996, firstly this tool was created to check the password strength and later on update the tool was able to perform brute-force attacks and dictionary attacks. To restore a session, issue: $ . It was designed to test password strength, brute-force encrypted (hashed) passwords, and crack passwords via dictionary attacks. John the ripper is not installed by default. Te gustó? Recuerda seguirnos y activ Jan 31, 2023 · John the Ripper is a popular password cracking tool that can be used to perform brute-force attacks using different encryption technologies and helpful wordlists. Feb 12, 2023 · Hashcat and John the Ripper are both popular tools for password cracking. Desktop as well as add extra functionality like session management and easy. . Besides several crypt (3) password hash types most commonly found on various Unix systems, supported out of the box are Windows LM hashes , plus lots of other hashes and 8. Of course, John knows about wildcards and multiple files: $ /usr/sbin/john --show --users=0 *passwd*. This particular software can crack different types of hash which include the MD5, SHA, etc. John The Ripper 是一个免费的密码破解工具。. 0 implementation was achieved by Aleksey Cherepanov as part of GSoC 2012 and Mathieu Laprise took Johnny further towards 2. Usted puede encontrar básicamente tres versiones de John (se le menciona así como abreviatura a John the Ripper), la versión free, que es ampliamente utilizada, la versión John the Ripper Pro y la versión John the Ripper Jumbo. www . txt to open the file, then press i and add the username and exit the file using :wq. First, clone the git repository: $ git clone https://github. pot --make-charset=YOUR_NEW_FILE. It's a powerful piece of software that can be configured and used in many different ways. 00 site-wide or consultant license (at your option), RPM package (31 MB), free upgrades to further 1. I encrypted this zip with 7za a -tzip -p -sfx -mem=AES256 file1. 0 core is coming shortly. If you happen to get a password file that uses more than one hash type, then you have to invoke John once for each hash type and you need to use this option to make John crack hashes of types other than the one it would autodetect by default. Open the Command Prompt and navigate to the folder where you extracted John the Ripper. May 29, 2020 · To check if the root password got cracked, filter by UID: $ /usr/sbin/john --show --users=0 mypasswd. John the Ripper is free and Open Source software, distributed primarily in Step 4 Running John the Ripper. passwdqc is a proactive password/passphrase strength checking and policy enforcement toolset, which can prevent your users from choosing passwords that would be easily cracked with programs like John the Ripper. 0a plus a few more and, most importantly, it adds a preprocessor, which can generate multiple rules from a single source line. Type ls and press Enter to list the files in the directory. I'm pretty sure the password is complex. The log file . Dec 16, 2017 · John the ripper logs its activity to stdout. To force John to crack those same hashes again, remove the john. This can be used to extract hashes from a TrueCrypt volume with a command similar to the following: . zip file1. But password-protected documents from earlier versions of Office are susceptible to having their hashes extracted with a simple program called office2john. As part of this test, you're checking to see if the Security Account Manager (SAM) passwords from a Windows system can be cracked using John the Ripper. May 12, 2020 · A previous session can be retrieve thanks to john. Installing on Windows. Johnny the open source cross-platform GUI frontend for John the Ripper, the. Solution. If you are using Debian / Ubuntu Linux, enter: $ sudo apt-get install john. Sometimes even blind squirrels can find a nut. At the prompt, type cd /usr/share/john and press Enter to change directories to the folder containing the John the Ripper password file. It was designed to test password strength, brute-force encrypted (hashed) Mar 20, 2019 · The correct way is to extract the password hash from the file and then cracking it using John The Ripper. password-generator hacking password bruteforce wordlist hydra brute-force john-the-ripper hacking-tool unique bruteforce-attacks bruteforce-password-cracker John the Ripper Pro password cracker. john will try to guess. txt testing. John the Ripper is a fast password cracker, available for many operating systems. To crack the password hash, we will use the syntax below: bash. It is among the most frequently used password testing and breaking programs [4] as it combines Jan 28, 2021 · When trying to crack with hashcat I used the following command to attempt to crack the hash: hashcat. When cracking the hash with john the ripper I used the following command: john --format=bcrypt --wordlist=rockyou. To be more precise, this is an offline brute-forcer (online brute-forcers perform the attack by connecting to network services, and offline crackers work with captured hashes (files) to which they guess a password). 4–1. The jumbo version can crack over 411 types of passwords, from Unix passwords to databases and from iTunes backups to Wi-Fi passwords. John the Ripper is a free password cracking software tool. Jul 23, 2021 · ورشة عمل Hash cracking with John the Ripperفي هذه الورشة تعرفنا على أحد أشهر الأدوات المخصصة لكسر التشفير وهي أداة John the Ripper Despite the fact that Johnny is oriented onto core john, all basic functionality is supposed to work in all versions, even Jumbo. txt" file very simular to John the Ripper - these rules are also almost as good as John's default ruleset. Jan 20, 2020 · try john --show then enter the hash file location eg john --show Desktop/hash1. John the Ripper Pro password cracker. Wordlist mode compares the hash to a known list of potential password matches. Now we can find out the hash type easily if you remember from the above tasks! (the python script). Nov 27, 2023 · Here is a simple step-by-step process to use John the Ripper to crack account passwords in Kali Linux: Collect password hashes. Features highlight: Supports 13 hash types: LM, NTLM, MD5, SHA-1, SHA-256, SHA-512, DCC, DCC2, SSHA, md5crypt, bcrypt, sha256crypt, sha512crypt. If you note that it's cracked a password, you can terminate the session with a ctrl-C. popular password cracker, written in C++ using the Qt framework. To crack multiple files that have the same encryption just add them both to the end. John the Ripper is free and Open Source software, distributed primarily in Jul 11, 2021 · John the Ripper is unable to crack my SHA1 hashed password: john --wordlist=rockyou. Just as you can filter by user, you can also filter by group, by using the –groups flag, and that filtering is available also when cracking. La versión Pro tiene ventajas frente a la free, por ejemplo: detecta de forma automática cualquier mejora Jun 11, 2022 · Cracking Multiple files. /john --show /etc/shadow 0 password hashes cracked, 2 left Sep 17, 2014 · Install John the Ripper Password Cracking Tool. tc > truecrypt_hashes. txt Whenever I do this in Kali Linux, I get this response: Loaded 1 password hash (Raw-SHA1 [SHA1 256/256 AVX2 8x]) Warning: no OpenMP support for this hash type, consider --fork=2 Then, when I try to show the password with: john --show testing. rec file. 它最初为Unix操作系统开发，但可以在十五种不同的平台上运行（其中十一种是特殊体系结构的Unix，以及DOS，Win32，BeOS和OpenVMS版本）。. Practical examples of John the Ripper usage. Mar 12, 2019 · Hack Like a Pro: How to Crack Passwords, Part 1 (Principles & Technologies) Forum Thread: Cracking Passwords Using John the Ripper 14 Replies 2 yrs ago Hack Like a Pro: How to Crack Passwords, Part 2 (Cracking Strategy) On a second note, after you crack it you can see the results with "john --show password". hash Now we run John and get the password! Sep 11, 2020 · 3. The resulting file will look something like the following: Aug 24, 2023 · sudo apt install john. Apr 1, 2023 · In this educational video, we'll explore the powerful password-cracking tool, John the Ripper, and learn how to use it to crack passwords. May 10, 2020 · Challenge Statement. john/john. txt hashes. The single crack mode is the fastest and best mode if you have a full password file to crack. 3. 8 How to recover an interrupted John the Ripper session. I got this output: Then I try running john on it: John the Ripper jumbo - advanced offline password cracker, which supports hundreds of hash and cipher types, and runs on many operating systems, CPUs, GPUs, and even some FPGAs - UnbreakableMJ/John Aug 21, 2015 · The first thing the attacker needs to do is convert it to a john friendly format. ), macOS, Windows, "web apps" (e. In this video, we will be exploring how to use John the Ripper to crack password hashes Jun 2, 2013 · John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Convert Jul 13, 2021 · We need to add the given username Joker to the text file. Once downloaded use the rpm command as follows to install the same: # rpm -ivh john*. git. Built from the ground up to be focused only on working with passwords, this versatile password utility is distributed without a Oct 5, 2022 · John the Ripper supports a massive list of different password hash types. 0-jumbo-1 32-bit Windows. 3. 95 Aug 29, 2020 · Description. txt” is present in the wordlists directory. Place the password-protected ZIP file that you want to crack in a directory accessible by the John the Ripper tool. How to brute force non-standard hashes. 它是最常用的密码测试和破解程序之一 [4] [5] ，因为它 May 19, 2019 · John the Ripper usage examples. Its primary purpose is to detect weak Unix passwords. At your own risk try running john and john rm . These examples are to give you some tips on what John's features can be used for. Jan 9, 2020 · The process involves two basic steps, the first is called unshadowing while the second is the cracking itself. requires a contributed patch). Johnny is a separate program, therefore, you need to have John the Ripper installed in order to use it. Now you can crack it with John: Jul 6, 2021 · galoget@hackem:~$ john hash_to_crack. For example, you can’t feed John the Ripper an encrypted Word Feb 19, 2024 · These days, this original John the Ripper source tree serves primarily as the core tree for John the Ripper -jumbo. There is a free and pro version of This tool helps to create a unique wordlist which can crack more than 50% of passwords using brute-force attack, so on social media sites such as: Facebook, Instagram, Twitter etc as well. pot file. 8. John finds these three passwords rapidly. Lab assignment 9:10 pm lab report 12. Jul 27, 2011 · It uses hashes in the database as input, so make sure you've run hashdump with a database connected to your Framework instance (Pro does this automatically) before running the module. /truecrypt2john. So, password could be loaded from file and cracked with different options. John the Ripper is a fast password cracker, currently available for. /john --restore Retrieve cracked passwords. openwall . 5. BitLocker offers a number of different authentication methods to encrypt a storage device 网站. John [path/to/target/file] John the Ripper will start processing the password hashes using the default settings. The default syntax will be: john --format=<passwords-format> <file>. It was designed to test password strength, brute-force encrypted (hashed Jan 1, 2022 · John the Ripper Password Cracker Download is an old but very good password cracker that uses wordlists or dictionaries, in other words, to crack a given hash. Sep 2, 2023 · John the Ripper, affectionately known as JtR, is a free and open-source password-cracking software designed to identify weak passwords and enhance network security. Both have pros and cons, and in this article, we will review some of them. Cheers! Reply reply thekarmabum • Grep is your friend :) Jul 31, 2020 · 10. To crack complex passwords or use large wordlists, John the Ripper should be used outside of Metasploit. txt Apr 22, 2021 · john [options] [path to file] Where: john - invokes the programs [path to file] - file containing the hash you are trying to crack. Use tools like pwdump, fgdump, etc to extract password hashes from systems like Linux and Windows. Anyway, once this file on Kali Linux, you can use John to try cracking some of the passwords. John the Ripper works on the hash of the password, not the file itself. All you need to do is specify a wordlist (a text file containing one word per line) and some password John the Ripper is a free password cracking software tool. 0 Pro for Linux with upgrades and support - $185. /gpg2john asdfgpg. 0 and beyond as part of GSoC 2015. In the terminal type vim hash7. Jun 15, 2019 · John is able to crack WPA-PSK and WPA2-PSK passwords. Its primary functions encompass Nov 30, 2022 · John the RipperとHashcatについて、オフラインパスワードクラッキングの性能比較を行うため、Windows+GPU環境でJohn the Ripperを使えるようにしました。 ※注意 本記事の内容は犯罪行為を助長するものではありません。サイバー空間の安心・安全な環境を確保する目的にのみ利用し、絶対に悪用しないで hccap is short for hashcat cap file, it is a file type that can contain WPA handshakes. Its primary purpose is to detect weak Unix passwords, although Windows LM hashes and a number of other password hash types are supported as well. 2. You signed out in another tab or window. Aug 29, 2020 · What is John the Ripper. Rule-based attack. txt md5. But if you hope to increase your chances for success, you should specify hash type and separate out different hashes of different types into their own files. To retrieve cracked passwords (in this example, no password has been cracked, session has been aborted): $ . conf (under [List. When defining rules, simply place one rule (which may include preprocessor commands) per line. txt During the attempt hashcat reported a speed of: 52 H/s (3. Prepare hashes for cracking. g. John the Ripper jumbo supports hundreds of hash and cipher types, including for: user passwords of Unix flavors (Linux, *BSD, Solaris, AIX, QNX, etc. A: With PWDUMP-format files, John focuses on LM rather than NTLM hashes by default, and it might not load any hashes at all if there are no LM hashes to crack. zip doesn't seem to be encrypted using OpenSSL's enc command! zip2john fails with error: Did not find a Central Directory File Header at expected file offset 100. System-wide installation is also supported, but it is intended Mar 22, 2020 · How to use John the Ripper for Windows Passwords Cracking. 91ms). $ sudo john --single shadow. Dec 19, 2019 · There are many password-cracking tools out there, but one of the mainstays has always been John the Ripper. exe -a 0 -m 3200 hashes. Aug 1, 2010 · The results are stored in the john. In the terminal, enter the following command to initiate the John the Ripper program. From the image, you can see JtR cracked the password for users johndoe and Karen. The users are the ones enclosed in brackets. /rockyou. The pdf file is present in the user’s home directory and the dictionary file “1000000-password-seclists. If your system uses shadow passwords, you may use John's "unshadow" utility to obtain the traditional Unix password file, as root: umask 077 unshadow /etc/passwd John the Ripper is a free, open-source, multi-platform password cracking software that runs on Windows, macOS, Linux, and other Unix-like operating systems. 1. The password was chosen either from a dictionary or using the password policy. John the Ripper’s primary modes to crack passwords are single crack mode, wordlist mode, and incremental. Actually has a "Rules. Warning: detected hash type "gpg", but the string is also recognized as "gpg-opencl". RHEL, CentOS, Fedora, Redhat Linux user can grab john the ripper here. To do this, we use the following syntax: john --wordlist=[wordlist] [path to file Jul 17, 2022 · The next hash that somehow managed to sneak its way into my directory is a SHA1 hash. Note that John can't crack hashes of different types at the same time. py test. Then type “john –wordlist=wordlist –hash=hashfile –stdin”. An encrypted PDF (1. The jumbo pack version of jtr has a tool called gpg2john: $ . john. \john. com/magnumripper/JohnTheRipper. txt; Get results. Both are just password cracking methods. I have a password-protected zip file. Use the hccap2john utility to convert an hccap file to a john hash file: $ hccap2john capture. John the Ripper provides high-speed password cracking capabilities to security Nov 26, 2021 · John the ripper is a powerful “ password cracking tool ”. pot or rm john. To have JtR Pro or a -jumbo version focus on NTLM hashes instead, you need to pass the "--format=nt" option. John the Ripper is a part of the Rapid7 family of penetration testing/ hacking tools. hashes on the Desktop. Its main strength lies in detecting password hashes and running against the very best ones (apart from AES). Command line. priv > gpghashtest. 4 min read Mar 14, 2019 · Microsoft Office files can be password-protected in order to prevent tampering and ensure data integrity. It is notable for supporting a diversity of password formats. or because you have run the same hash before john already has it saved in . In my case: john --format=Raw-md5 md5-passwords. ========. 5. It's also a convenient intermediary format between John and Aircrack. 2. 1 > id_rsa. 0 Pro for Linux with upgrades - $89. This module uses John the Ripper to identify weak passwords that have been acquired as hashed files (loot) or raw LANMAN/NTLM hashes (hashdump). exe Cracking Passwords. Jun 24, 2021 · No. Click on the one as per your system configuration. Jul 1, 2020 · First released in 1996, John the Ripper (JtR) is a password cracking tool originally produced for UNIX-based systems. /john gpghashtest. At the time of writing, John the Ripper supports this long list of password formats. Johnny's aim is to automate and simplify the password cracking routine on the. [3] Originally developed for the Unix operating system, it can run on fifteen different platforms (eleven of which are architecture-specific versions of Unix, DOS, Win32, BeOS, and OpenVMS ). 10 crack password with john the ripper lab report time spent: 11:31 score: pass passing score: task summary required. , WordPress), groupware (e. Add a comment. The module collects the hashes in the database and passes them to the john binaries that are now ( r13135 ) included in Framework via a generated PWDUMP-format file. Oct 28, 2021 · Hash Suite Droid is, as far as we're aware, the first multi-hash cracker developed specifically for Android devices (as compared to the rather rough unofficial builds of John the Ripper for Android ). John will load your password file, and try a few algorithms to crack them (there is a minimal word list tested by default, and it Jan 27, 2020 · Using John the Ripper to extract passwords from a sam database Hash Dump. com /john /. x Pro releases for Linux, 1 year of e-mail support on JtR Pro and JtR jumbo (up to 2 hours) John the Ripper 1. This will start the John the Ripper tool and attempt to crack any passwords in the word list that have the same hash as in the hash file. You switched accounts on another tab or window. We can help you integrate modern password hashing with yescrypt or crypt_blowfish , and/or proactive password strength checking with Oct 23, 2021 · We will copy the whole field and save it in a file with a name shadow. txt Warning: detected hash type "sha512crypt", but the string is also recognized as "HMAC-SHA256" Use the "--format=HMAC-SHA256" option to force loading these as that type instead Using default input encoding: UTF-8 Loaded 1 password hash (sha512crypt, crypt(3) $6 Welcome to this tutorial on password cracking using John the Ripper. ); network traffic captures (Windows network authentication, WiFi WPA-PSK, etc Oct 25, 2023 · Run crack. Right: Generating hashes for three simple passwords. Recent changes have improved performance when there are multiple hashes in the input file, that have the same SSID (the routers 'name' string). ue sg db ac xv ty bw rz tu oj