LAB 1 – Cracking Weak Passwords
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Automating Security Checks
Mag. iur. Dr. techn. Michael Sonntag Automating security checks Institute for Information Processing and Microprocessor Technology (FIM) Johannes Kepler University Linz, Austria E-Mail: [email protected] http://www.fim.uni-linz.ac.at/staff/sonntag.htm © Michael Sonntag 2010 Agenda Why automatization? What can be automated? Example: Skipfish How reliable are these tools? Practical examples of searching for vulnerabilities: Information collection with NMap Password cracking (John the Ripper, Ophcrack) Exploit scanning with Nessus Michael Sonntag Automating security checks 2 Why automatization? Ensuring security is not that hard for a single system You know it in detail When something is discovered, it is implemented and tested But: Many sites with many configuration options? Do you know them all? » Are they identical everywhere (versions!)? Do you have time to change everything accordingly? » Or do you depend on automatic updates/roll-out? Are you sure you did not miss one option somewhere? » Testing the same thing several times is tedious Solution: Automatic testing whether a problem exists Professionals write tests You just apply them » No need to know exactly how the attack works! Regular re-testing is possible Ad-hoc & patchy testing Systematic & comprehensive Michael Sonntag Automating security checks 3 Overlap with monitoring Some overlap with system monitoring exists Failures are just a “different kind” of attack Some problems may occur accidentally or intentionally » Example: Blacklisting of mail -
Assignment 3 – Authentication July 2021 Due Thursday, August 12, 2021
CryptoWorks21 Network Security Assignment 3 – Authentication July 2021 due Thursday, August 12, 2021 Assignment 3 – Authentication Assignment reports must be submitted by Thursday, August 12, 2021. Assignment Description In this assignment you will carry out exercises related to the lectures on authentication. You will work on cracking password hashes, as well as investigate two-factor authentication on the Internet. Assignment Requirements and Setup Virtual machines. You will need to use the Kali Linux virtual machines. If you have not downloaded and installed it yet, please check the “Assignment 0” document. John the Ripper. You will need to use a tool called John the Ripper in order to crack password hashes. This tool is pre-installed in the Kali Linux virtual machine. However, John is very computationally intensive, and it might run faster on your main computer rather than inside a virtual machine. If you do decide to install it on your main computer, be sure to use the “jumbo” version, which contains support for many more types of hash algorithms. • For Windows, you can download a jumbo build from the John the Ripper homepage (http://www.openwall.com/john/) • For macOS, you can install John using the command-line package manager “Home- brew”. To install Homebrew, visit https://brew.sh/. Once you’ve installed Home- brew, you can install John using the command brew install john-jumbo . Getting text to and from your virtual machine. During this assignment, you may need to copy text to or from your various virtual machines. This can be somewhat annoying. It is possible to set up shared clipboards in VirtualBox (Settings Ñ General Ñ Advanced Ñ Shared Clipboard Ñ Bidirectional), but these are not always reliable. -
Hash Crack: Password Cracking Manual
Hash Crack. Copyright © 2017 Netmux LLC All rights reserved. Without limiting the rights under the copyright reserved above, no part of this publication may be reproduced, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without prior written permission. ISBN-10: 1975924584 ISBN-13: 978-1975924584 Netmux and the Netmux logo are registered trademarks of Netmux, LLC. Other product and company names mentioned herein may be the trademarks of their respective owners. Rather than use a trademark symbol with every occurrence of a trademarked name, we are using the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The information in this book is distributed on an “As Is” basis, without warranty. While every precaution has been taken in the preparation of this work, neither the author nor Netmux LLC, shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the information contained in it. While every effort has been made to ensure the accuracy and legitimacy of the references, referrals, and links (collectively “Links”) presented in this book/ebook, Netmux is not responsible or liable for broken Links or missing or fallacious information at the Links. Any Links in this book to a specific product, process, website, or service do not constitute or imply an endorsement by Netmux of same, or its producer or provider. The views and opinions contained at any Links do not necessarily express or reflect those of Netmux. -
NCL Password Cracking--Key Getting Started You Can Install a Pre-Built Vmware VM from Here
NCL Password Cracking--Key Getting Started You can install a pre-built VMware VM from here. You just need to open the VM, not install it. The login credentials are kali, kali. https://www.offensive-security.com/kali-linux-vm-vmware-virtualbox-image-download/ Then read this excellent blog from NCL. https://cryptokait.com/2019/09/24/everything-you-need-to-know-about-password-cracking-for-the- national-cyber-league-games/ A Note about Hashcat Hashcat, and the older John the Ripper, keep a list of hashes they have already cracked. If the hash is in the list, it will not appear in the output. This can be confusing if you are having problems and run the same hash file repeatedly. If you think some cracked hashes are missing, look in .hashcat/hashcat.potfile in your home directory, or perhaps where you ran hashcat from. If you want to start from scratch, just delete .hashcat/hashcat.potfile A Crack to Start With This is from the paragraph in the NCL Blog, “Using a Pre-Made Wordlist on Kali.” Follow the procedure to unzip (actually Gnu unzip or gunzip) the password list from the rockyou.com breach (I moved rockyou.txt to my home directory instead of Downloads.) Then run the hashcat line, hashcat -m 0 {means the hashes are MD5} -a 0 {attack will be wordlist only} -o outputfile {where the output goes} hashlist pwlist Here are the hashes. 8549137cd494c22ae87eef3e18a46986 0f96a320a8c0bf7e3f6d375b0d9d3a4c 1a8cb8d148b513dfa1d285077fc4e3fb 22a313110bf5b84c0a58eecc27deaa30 e4fd50109f0e40e8c1a895d8e5c71199 These are easy and should crack in under a minute. Solution Save the hashes in a file on Kali. -
Chapter 5 Results
CHAPTER 5 RESULTS 5.1 Results This chapter will discuss the results of the testing and comparison of the password cracking tools used. This chapter can be summarized as follows: • Research Data and Result Analysis (Locally) • Research Data and Result Analysis (Remotely) • Research Data and Result Analysis (Alphabets only) • Research Data and Result Analysis (Alphabets and a special character) 5.2 Research Data and Result Analysis (Locally) In Figure 16, Ophcrack was used to crack the local users' password with different combinations of password, alphabets, alphanumeric, alphanumeric special characters, english and non-english words. In Figure 17, Ophcrack was used to crack the same password, but excluding the 3 password that were not cracked in the previous attempt. In Figure 18, Cain was used to crack the local users' password. 35 36 Figure 16 - Ophcrack cracked 7 of 10 passwords Figure 17 - Ophcrack cracked 7 of 7 passwords 37 Figure 18 - Cain cracked 5 of 10 passwords 5.3 Research Data and Result Analysis (Remotely) First, the author scans the network for active IP address with NMAP (Figure 19). He used the command of "nmap -O 192.168.1.1-254" to scan the network, it would scan each IP address for active computer. The command -O enabled operating system detection. From the result of the scanning, there were few ports in the state of open and the services that were using those ports, 135/TCP, 139/TCP, 445/TCP and 1984/TCP. Another important detail was the OS details; it showed that the computer was running under Microsoft Windows XP Professional SP2 or Windows Server 2003. -
Password Security - When Passwords Are There for the World to See
Password Security - When Passwords are there for the World to see Eleanore Young Marc Ruef (Editor) Offense Department, scip AG Research Department, scip AG [email protected] [email protected] https://www.scip.ch https://www.scip.ch Keywords: Bitcoin, Exchange, GitHub, Hashcat, Leak, OWASP, Password, Policy, Rapid, Storage 1. Preface password from a hash without having to attempt a reversal of the hashing algorithm. This paper was written in 2017 as part of a research project at scip AG, Switzerland. It was initially published online at Furthermore, if passwords are fed through hashing https://www.scip.ch/en/?labs.20170112 and is available in algorithms as is, two persons who happen to use the same English and German. Providing our clients with innovative password, will also have the same hash value. As a research for the information technology of the future is an countermeasure, developers have started adding random essential part of our company culture. user-specific values (the salt) to the password before calculating the hash. The salt will then be stored alongside 2. Introduction the password hash in the user account database. As such, even if two persons use the same password, their resulting The year 2016 has seen many reveals of successful attacks hash value will be different due to the added salt. on user account databases; the most notable cases being the attacks on Yahoo [1] and Dropbox [2]. Thanks to recent Modern GPU architectures are designed for large scale advances not only in graphics processing hardware (GPUs), parallelism. Currently, a decent consumer-grade graphics but also in password cracking software, it has become card is capable of performing on the order of 1000 dangerously cheap to determine the actual passwords from calculations simultaneously. -
Computer Forensics CCIC Training Chapter 4: Understanding the Registry
Computer Forensics CCIC Training Chapter 4: Understanding the Registry Lauren Pixley, Cassidy Elwell, and James Poirier March 2020 (Version 3) This work by California Cybersecurity Institute is licensed under a Attribution-NonCommercial-NoDerivatives 4.0 International License. Introduction As you are going through your investigation, you will need to know basic information about the forensic image you are searching. To find out more about the image you are analyzing, you will need to look through the Windows Registry. The Windows Registry is basically a database that stores thousands of records with information, such as the operating system, time zone, user settings, user accounts, external storage devices, and some program data. When you look through the Windows Registry in the next section with REGEDIT, it may appear as though the registry is one large storage location. However, there are several files where the information is being stored throughout the computer. REGEDIT simply takes these files and records stored in different locations and displays them for you. There are many records in the Windows Registry that will have no forensic value to you as an examiner, but there are some pieces of information that you will find useful. This chapter will walk you through the basic structure of the registry and where you need to look to find information that is valuable to your investigation. REGEDIT In this section, you will start with the Windows registry utility known as REGEDIT.exe. You can open this by pressing the Windows key+R and then typing in “REGEDIT”. You can also click on the Start menu and type “REGEDIT” in the Search box. -
How to Handle Rainbow Tables with External Memory
How to Handle Rainbow Tables with External Memory Gildas Avoine1;2;5, Xavier Carpent3, Barbara Kordy1;5, and Florent Tardif4;5 1 INSA Rennes, France 2 Institut Universitaire de France, France 3 University of California, Irvine, USA 4 University of Rennes 1, France 5 IRISA, UMR 6074, France [email protected] Abstract. A cryptanalytic time-memory trade-off is a technique that aims to reduce the time needed to perform an exhaustive search. Such a technique requires large-scale precomputation that is performed once for all and whose result is stored in a fast-access internal memory. When the considered cryptographic problem is overwhelmingly-sized, using an ex- ternal memory is eventually needed, though. In this paper, we consider the rainbow tables { the most widely spread version of time-memory trade-offs. The objective of our work is to analyze the relevance of storing the precomputed data on an external memory (SSD and HDD) possibly mingled with an internal one (RAM). We provide an analytical evalua- tion of the performance, followed by an experimental validation, and we state that using SSD or HDD is fully suited to practical cases, which are identified. Keywords: time memory trade-off, rainbow tables, external memory 1 Introduction A cryptanalytic time-memory trade-off (TMTO) is a technique introduced by Martin Hellman in 1980 [14] to reduce the time needed to perform an exhaustive search. The key-point of the technique resides in the precomputation of tables that are then used to speed up the attack itself. Given that the precomputation phase is much more expensive than an exhaustive search, a TMTO makes sense in a few scenarios, e.g., when the adversary has plenty of time for preparing the attack while she has a very little time to perform it, the adversary must repeat the attack many times, or the adversary is not powerful enough to carry out an exhaustive search but she can download precomputed tables. -
Ophcrack USB Booting Windows Password Recovery for Windows XP Or Vista
Ophcrack USB Booting Windows Password Recovery for Windows XP or Vista Labels: How To, Password, Solutions, USB BOOT, Windows We have already seen using Ophcrack Live CD for Cracking Windows XP and Windows Vista Passwords. The thing is that now a days we do not use CDs anymore, we use USB drives for our day to day activities. Now what if you want to run Ophcrack from your USB drive instead of wasting money on a CD or if your CD ROM Drive is not working? Moreover using USB drives are more convenient and common these days. Here I have an Ideal solution for this question. But if you are not interested in recovering the password or you simply want to reset or delete the password then there is much easier technique which requires only a 3 MB file instead of Ophcrack. Just see how to Reset windows Password Using a USB drive or a CD In this method we will be using a program called 7-ZIP for extracting the ISO file and some batch files for making the drives bootable. USB Requirement: • Minimum 512 MB for Windows XP • Minimum 1 GB for Windows Vista Or Windows 7 Beta • Format: FAT32 I have tried this method in Windows XP, Windows Vista, and Windows 7 Beta and it works perfectly fine. Follow the steps below: Step 1: Download the ISO File For Ophcrack Live CD 2.1.0 From the links below: (Choose according to your operating system). If you have already downloaded skip this step. Windows XP: Size: 452 MB http://downloads.sourceforge.net/ophcrack/ophcrack-xp-livecd-2.1.0.iso Windows Vista or 7: Size: 532 MB http://downloads.sourceforge.net/ophcrack/ophcrack-vista-livecd-2.1.0.iso Step 2: Download the ZIP File For making USB boot version of Ophcrack Live CD From the link below: Size: 414 KB http://www.techrena.net/downloads/usbboot.zip Step 3: Extract the usbboot.zip file at any location of your computer, not in the USB drive. -
Password Cracking
Password Cracking Sam Martin and Mark Tokutomi 1 Introduction Passwords are a system designed to provide authentication. There are many different ways to authenticate users of a system: a user can present a physical object like a key card, prove identity using a personal characteristic like a fingerprint, or use something that only the user knows. In contrast to the other approaches listed, a primary benefit of using authentication through a pass- word is that in the event that your password becomes compromised it can be easily changed. This paper will discuss what password cracking is, techniques for password cracking when an attacker has the ability to attempt to log in to the system using a user name and password pair, techniques for when an attacker has access to however passwords are stored on the system, attacks involve observing password entry in some way and finally how graphical passwords and graphical password cracks work. Figure 1: The flow of password attacking possibilities. Figure 1 shows some scenarios attempts at password cracking can occur. The attacker can gain access to a machine through physical or remote access. The user could attempt to try each possible password or likely password (a form of dictionary attack). If the attack can gain access to hashes of the passwords it is possible to use software like OphCrack which utilizes Rainbow Tables to crack passwords[1]. A spammer may use dictionary attacks to gain access to bank accounts or other 1 web services as well. Wireless protocols are vulnerable to some password cracking techniques when packet sniffers are able to gain initialization packets. -
Download Ophcrack Live Iso Free Download Ophcrack for Windows 8/8.1
download ophcrack live iso Free Download Ophcrack for Windows 8/8.1. Cracking passwords is usually not required as long as you remember the passwords for the accounts on your machine. However, what sometimes happens is that you forget the password for an account on your computer and that's when you rush to a tool that can help you crack the password for that account. There are tons of tools in the market that can help you recover these forgotten passwords, however, only a handful of those actually work and let you regain access to your account. One of these handful tools is Ophcrack which is a known tool for cracking passwords on Windows computers. Ophcrack is a nice tool that helps you recover the passwords for the accounts on your Windows computer. You can even burn it to a CD and boot up your computer from it and then begin cracking passwords on your machine. Below we will show you how to free download Ophcrack Windows 8.1/8 USB to recover forgotten local Administrator and user password on Windows 8.1/8 easily. Downloading Ophcrack for Windows 8/8.1. 1. Open a web browser such as Google Chrome on your PC and head over to the Ophcrack website. When the website loads-up, you will find a button saying Download Live CD. Click on it and it will let you download the Live CD version of the Ophcrack app. So, that was how you could download and use Ophcrack for Windows 8 and 8.1. Ophcrack Cannot Work on Windows 8/8.1 Computer? As you know, Ophcrack is a free tool that can crack Windows XP/Vista/7 login password. -
UGRD 2015 Spring Bugg Chris.Pdf (464.4Kb)
We could consider using the Mighty Cracker Logo located in the Network Folder MIGHTY CRACKER Chris Bugg Chris Hamm Jon Wright Nick Baum Password Security • Password security is important. • Users • Weak and/or reused passwords • Developers and Admins • Choose insecure storage algorithms. • Mighty Cracker • Show real world impact of poor password security. OVERVIEW • We made a hash cracker. • Passwords are stored as hashes to protect them from intruders. • Our program uses several methods to ‘crack’ those hashes. • Networking • Spread work to multiple machines. • Cross Platform OTHER HASH CRACKING PRODUCTS • Hashcat • Cain and Abel • John the Ripper • THC-Hydra • Ophcrack • Network support is rare. WHAT IS HASHING • A way to encode a password to help protect it. • A mathematical one-way function. • MD5 hash • cf4ff726403b8a992fd43e09dd7b5717 • SHA-256 hash • 951e689364c979cc3aa17e6b0022ce6e4d0e3200d1c22dd68492c172241e0623 SUPPORTED HASHING ALGORITHMS • Current Algorithms • MD5 • SHA-1 • SHA-224 • SHA-256 • SHA-384 • SHA-512 WAYS TO CRACK • Cracking Modes • Single User • Network Mode • Methods of Cracking: • Brute Force • Dictionary • Rainbow Table • GUI or Console BRUTE FORCE • Systematically checking all possible keys until the correct one is found. • Worst case this would transverse the entire search space. • Slowest but will always find the solution if given enough time. DICTIONARY ATTACK • List of common passwords from leaks/hacks. • Many people choose common passwords • Written works of Shakespeare ~66,000 words • Oxford English Dictionary ~290,000 words • Small dictionary = 900,000 words • Medium dictionary = 14 million words • Large dictionary = 1.2 billion words RAINBOW TABLE • Can’t store all possible hash/key combinations. • 16 character key = 10^40th combinations • 10^50th atoms on earth • Rainbow tables • Reduced storage.