Ethical hacking tutorial
- 2. Ethical Hacking i AboutthisTutorial Hacking has been a part of computing for almost five decades and it is a very broad discipline, which covers a wide range of topics. The first known event of hacking had taken place in 1960 at MIT and at the same time, the term "Hacker" was originated. In this tutorial, we will take you through the various concepts of Ethical Hacking and explain how you can use them in a real-time environment. Audience This tutorial has been prepared for professionals aspiring to learn the basics of Ethical Hacking and make a career as an ethical hacker. Prerequisites Before proceeding with this tutorial, you should have a good grasp over all the fundamental concepts of a computer and how it operates in a networked environment. Copyright&Disclaimer Copyright 2018 by Tutorials Point (I) Pvt. Ltd. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at [email protected]
- 3. Ethical Hacking ii TableofContents About this Tutorial .................................................................................................................................i Audience ................................................................................................................................................i Prerequisites ..........................................................................................................................................i Copyright & Disclaimer...........................................................................................................................i Table of Contents ..................................................................................................................................ii 1. ETHICAL HACKING − OVERVIEW...................................................................................... 1 Types of Hacking....................................................................................................................................1 Advantages of Hacking ..........................................................................................................................1 Disadvantages of Hacking......................................................................................................................2 Purpose of Hacking................................................................................................................................2 2. ETHICAL HACKING − HACKER TYPES ............................................................................. 3 White Hat Hackers.................................................................................................................................3 Black Hat Hackers..................................................................................................................................3 Grey Hat Hackers...................................................................................................................................3 Miscellaneous Hackers ..........................................................................................................................3 3. ETHICAL HACKING − FAMOUS HACKERS....................................................................... 5 4. ETHICAL HACKING − TERMINOLOGIES.......................................................................... 9 5. ETHICAL HACKING − TOOLS ............................................................................................12 6. ETHICAL HACKING − SKILLS............................................................................................16 Basic Skills ...........................................................................................................................................16 Courses & Certifications ......................................................................................................................16 7. ETHICAL HACKING − PROCESS........................................................................................18
- 4. Ethical Hacking iii 8. ETHICAL HACKING − RECONNAISSANCE .....................................................................20 9. ETHICAL HACKING − FOOTPRINTING...........................................................................21 Domain Name Information..................................................................................................................21 Finding IP Address ...............................................................................................................................23 Finding Hosting Company....................................................................................................................23 IP Address Ranges ...............................................................................................................................24 History of the Website.........................................................................................................................24 10. ETHICAL HACKING − FINGERPRINTING.......................................................................26 Basic Steps...........................................................................................................................................26 Port Scanning ......................................................................................................................................28 Ping Sweep..........................................................................................................................................29 DNS Enumeration ................................................................................................................................29 11. ETHICAL HACKING − SNIFFING.......................................................................................31 Types of Sniffing..................................................................................................................................32 Hardware Protocol Analyzers ..............................................................................................................33 Lawful Interception .............................................................................................................................34 12. ETHICAL HACKING − SNIFFING TOOLS.........................................................................35 13. ETHICAL HACKING − ARP POISONING..........................................................................36 What is ARP Spoofing? ........................................................................................................................36 What is MITM?....................................................................................................................................36 ARP Poisoning − Exercise .....................................................................................................................37 14. ETHICAL HACKING − DNS POISONING..........................................................................41 DNS Poisoning − Exercise.....................................................................................................................41 Defenses against DNS Poisoning..........................................................................................................42
- 5. Ethical Hacking iv 15. ETHICAL HACKING − EXPLOITATION...........................................................................44 16. ETHICAL HACKING − ENUMERATION ...........................................................................47 17. ETHICAL HACKING – METASPLOIT................................................................................50 Exploits of Metasploit..........................................................................................................................51 Metasploit Payloads............................................................................................................................52 18. ETHICAL HACKING – TROJAN ATTACKS ......................................................................55 19. ETHICAL HACKING – TCP/IP HIJACKING .....................................................................56 20. ETHICAL HACKING – EMAIL HIJACKING.......................................................................59 Email Spoofing.....................................................................................................................................59 Social Engineering ...............................................................................................................................59 Inserting Viruses in a User System.......................................................................................................61 21. ETHICAL HACKING – PASSWORD HACKING ...............................................................62 Dictionary Attack.................................................................................................................................62 Hybrid Dictionary Attack .....................................................................................................................63 Brute-Force Attack ..............................................................................................................................63 Rainbow Tables ...................................................................................................................................64 22. ETHICAL HACKING – WIRELESS HACKING..................................................................66 Kismet .................................................................................................................................................67 NetStumbler........................................................................................................................................68 Wired Equivalent Privacy.....................................................................................................................69 Wireless DoS Attacks...........................................................................................................................71 23. ETHICAL HACKING − SOCIAL ENGINEERING ..............................................................72
- 6. Ethical Hacking v 24. ETHICAL HACKING − DDOS ATTACKS...........................................................................74 What are Botnets?...............................................................................................................................74 Types of DDoS Attacks.........................................................................................................................75 25. ETHICAL HACKING – CROSS-SITE SCRIPTING............................................................78 26. ETHICAL HACKING – SQL INJECTION ............................................................................80 27. ETHICAL HACKING – PEN TESTING................................................................................85
- 7. Ethical Hacking 1 Hacking has been a part of computing for almost five decades and it is a very broad discipline, which covers a wide range of topics. The first known event of hacking had taken place in 1960 at MIT and at the same time, the term "Hacker" was originated. Hacking is the act of finding the possible entry points that exist in a computer system or a computer network and finally entering into them. Hacking is usually done to gain unauthorized access to a computer system or a computer network, either to harm the systems or to steal sensitive information available on the computer. Hacking is usually legal as long as it is being done to find weaknesses in a computer or network system for testing purpose. This sort of hacking is what we call Ethical Hacking. A computer expert who does the act of hacking is called a "Hacker". Hackers are those who seek knowledge, to understand how systems operate, how they are designed, and then attempt to play with these systems. TypesofHacking We can segregate hacking into different categories, based on what is being hacked. Here is a set of examples: Website Hacking: Hacking a website means taking unauthorized control over a web server and its associated software such as databases and other interfaces. Network Hacking: Hacking a network means gathering information about a network by using tools like Telnet, NS lookup, Ping, Tracert, Netstat, etc. with the intent to harm the network system and hamper its operation. Email Hacking: It includes getting unauthorized access on an Email account and using it without taking the consent of its owner. Ethical Hacking: Ethical hacking involves finding weaknesses in a computer or network system for testing purpose and finally getting them fixed. Password Hacking: This is the process of recovering secret passwords from data that has been stored in or transmitted by a computer system. Computer Hacking: This is the process of stealing computer ID and password by applying hacking methods and getting unauthorized access to a computer system. AdvantagesofHacking Hacking is quite useful in the following scenarios: To recover lost information, especially in case you lost your password. To perform penetration testing to strengthen computer and network security. To put adequate preventative measures in place to prevent security breaches. 1. Ethical Hacking − Overview
- 8. Ethical Hacking 2 To have a computer system that prevents malicious hackers from gaining access. DisadvantagesofHacking Hacking is quite dangerous if it is done with harmful intent. It can cause: Massive security breach. Unauthorized system access on private information. Privacy violation. Hampering system operation. Denial of service attacks Malicious attack on the system. PurposeofHacking There could be various positive and negative intentions behind performing hacking activities. Here is a list of some probable reasons why people indulge in hacking activities: Just for fun Show-off Steal important information Damaging the system Hampering privacy Money extortion System security testing To break policy compliance
- 9. Ethical Hacking 3 Hackers can be classified into different categories such as white hat, black hat, and grey hat, based on their intent of hacking a system. These different terms come from old Spaghetti Westerns, where the bad guy wears a black cowboy hat and the good guy wears a white hat. WhiteHatHackers White Hat hackers are also known as Ethical Hackers. They never intent to harm a system, rather they try to find out weaknesses in a computer or a network system as a part of penetration testing and vulnerability assessments. Ethical hacking is not illegal and it is one of the demanding jobs available in the IT industry. There are numerous companies that hire ethical hackers for penetration testing and vulnerability assessments. BlackHatHackers Black Hat hackers, also known as crackers, are those who hack in order to gain unauthorized access to a system and harm its operations or steal sensitive information. Black Hat hacking is always illegal because of its bad intent which includes stealing corporate data, violating privacy, damaging the system, blocking network communication, etc. GreyHatHackers Grey hat hackers are a blend of both black hat and white hat hackers. They act without malicious intent but for their fun, they exploit a security weakness in a computer system or network without the owner’s permission or knowledge. Their intent is to bring the weakness to the attention of the owners and getting appreciation or a little bounty from the owners. MiscellaneousHackers Apart from the above well-known classes of hackers, we have the following categories of hackers based on what they hack and how they do it: Red Hat Hackers Red hat hackers are again a blend of both black hat and white hat hackers. They are usually on the level of hacking government agencies, top-secret information hubs, and generally anything that falls under the category of sensitive information. 2. Ethical Hacking − Hacker Types
- 10. Ethical Hacking 4 Blue Hat Hackers A blue hat hacker is someone outside computer security consulting firms who is used to bug-test a system prior to its launch. They look for loopholes that can be exploited and try to close these gaps. Microsoft also uses the term BlueHat to represent a series of security briefing events. Elite Hackers This is a social status among hackers, which is used to describe the most skilled. Newly discovered exploits will circulate among these hackers. Script Kiddie A script kiddie is a non-expert who breaks into computer systems by using pre-packaged automated tools written by others, usually with little understanding of the underlying concept, hence the term Kiddie. Neophyte A neophyte, "n00b", or "newbie" or "Green Hat Hacker" is someone who is new to hacking or phreaking and has almost no knowledge or experience of the workings of technology and hacking. Hacktivist A hacktivist is a hacker who utilizes technology to announce a social, ideological, religious, or political message. In general, most hacktivism involves website defacement or denial- of-service attacks.
- 11. Ethical Hacking 5 In this chapter, we will have a brief synopsis of some of the famous Hackers and how they became famous. Jonathan James Jonathan James was an American hacker, ill- famous as the first juvenile sent to prison for cybercrime in United States. He committed suicide in 2008 of a self-inflicted gunshot wound. In 1999, at the age of 16, he gained access to several computers by breaking the password of a server that belonged to NASA and stole the source code of the International Space Station among other sensitive information. Ian Murphy Ian Murphy, also known as Captain Zap, at one point of time was having high school students steal computer equipment for him. Ian self- proclaims to have been "the first hacker ever convicted of a crime". Ian's career as a master hacker was fabricated in 1986 after he and his unemployed wife decided to form some type of business. He has a long history of computer and Internet frauds. One of his favourite games is to forge Email headers and to send out third-party threat letters. 3. Ethical Hacking − Famous Hackers
- 12. Ethical Hacking 6 Kevin Mitnick Kevin Mitnick is a computer security consultant and author, who infiltrates his clients’ companies to expose their security strengths, weaknesses, and potential loopholes. He is the first hacker to have his face immortalized on an FBI "Most Wanted" poster. He was formerly the most wanted computer criminal in the history of United States. From the 1970s up until his last arrest in 1995, he skilfully bypassed corporate security safeguards, and found his way into some of the most well-guarded systems such as Sun Microsystems, Digital Equipment Corporation, Motorola, Netcom, and Nokia. Mark Abene Mark Abene, known around the world by his pseudonym Phiber Optik, is an information security expert and entrepreneur. He was a high-profile hacker in the 1980s and early 1990s. He was one of the first hackers to openly debate and defend the positive merits of ethical hacking as a beneficial tool to industry. His expertise spreads across penetration studies, on-site security assessments, secure code reviews, security policy review and generation, systems and network architecture, systems administration and network management, among many others. His clientele includes American Express, UBS, First USA, Ernst & Young, KPMG and others.
- 13. Ethical Hacking 7 Johan Helsingius Johan Helsingius, better known as Julf, came into the limelight in the 1980s when he started operating the world's most popular anonymous remailer, called penet.fi. Johan was also responsible for product development for the first Pan-European internet service provider, Eunet International. He is at present, a member of the board of Technologia Incognita, a hackerspace association in Amsterdam, and supports the communication companies worldwide with his cyber knowledge. Linus Torvalds Linus Torvalds is known as one of the best hackers of all time. He rose to fame by creating Linux, the very popular Unix-based operating system. Linux is open source and thousands of developers have contributed to its Kernel. However, Torvalds remains the ultimate authority on what new code is incorporated into the standard Linux kernel. As of 2006, approximately two percent of the Linux kernel was written by Torvalds himself. He just aspires to be simple and have fun by making the world’s best operating system. Torvalds has received honorary doctorates from Stockholm University and University of Helsinki. Robert Morris Robert Morris, known as the creator of the Morris Worm, the first computer worm to be unleashed on the Internet. The worm had the capability to slow down computers and make them no longer usable. As a result of this, he was sentenced to three years’ probation, 400 hours of community service and also had to pay a penalty amount of $10,500. Morris is currently working as a tenured professor at the MIT Computer Science and Artificial Intelligence Laboratory.
- 14. Ethical Hacking 8 Gary McKinnon Gary McKinnon is a renowned systems administrator and hacker. He was famously accused of the “biggest military computer hack of all time”. He had successfully hacked the networks of Army, Air Force, Navy and NASA systems of the United States government. In his statements to the media, he has often mentioned that his motivation was only to find evidence of UFOs, antigravity technology, and the suppression of “free energy” that could potentially be useful to the public. Kevin Poulsen Kevin Poulsen, also known as Dark Dante, became famous for his notoriety when he took over all the telephone lines of Los Angeles radio station KIIS-FM, guaranteeing that he would be the 102nd caller and win the prize of a Porsche 944 S2. Poulsen also drew the ire of FBI, when he hacked into federal computers for wiretap information, for which he had to serve a sentence of five years. He has reinvented himself as a journalist and has carved a niche for himself in this field.
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