Introduction to Kali Linux

                                                                                                    Last Updated : 10 Feb, 2025

Operating System is the main system software which is responsible for the flawless working of the machine. Some Operating Systems are designed for some specific purposes. Though we could use them for anything we want to, but they have some special tools or services available feasibly to its users which makes it a good OS for the specific purpose. Like we generally prefer Windows in case of gaming as most of the games are available for windows itself. Likewise, we prefer mac OS for designing related purposes as most of the designing software is easily available for mac and can be used flawlessly. In the same way when we have an OS for Network Security, Digital Forensics, Penetration testing, or Ethical Hacking named Kali Linux. 

Kali Linux is a Debian-derived Linux distribution that is maintained by Offensive Security. It was developed by Mati Aharoni and Devon Kearns. Kali Linux is a specially designed OS for network analysts, Penetration testers, or in simple words, it is for those who work under the umbrella of cybersecurity and analysis. The official website of Kali Linux is Kali.org. It gained its popularity when it was practically used in Mr. Robot Series. It was not designed for general purposes, it is supposed to be used by professionals or by those who know how to operate Linux/Kali. To know how to install Kali Linux check its official documentation


Advantages:  

  • It has 600+ Penetration testing and network security tools pre-installed.
  • It is completely free and open source. So you can use it for free and even contribute for its development.
  • It supports many languages.
  • Great for those who are intermediate in linux and have their hands on Linux commands.
  • Could be easily used with Raspberry Pi.

Why Kali Linux? 

If you are interested in penetration testing or cybersecurity stuff you need some specific tools to perform some tasks which come pre-installed and settled up in Kali Linux so you may directly use them without doing any configuration. Or in case if one wants to check the vulnerabilities on a website or want to know security-related bugs in any application then it is great to go with Kali Linux. 

Many people think that Kali is a tool for hacking or cracking social accounts or web servers. This is one of the biggest myths about Kali Linux. Kali Linux is just another Debian distribution with a bunch of networking and security tools. It is a weapon to train or defend yourself not to attack anyone. Kali Linux was designed mainly for professionals. It is for those who want to get their hands in Penetration Testing, Cyber Security, or Ethical Hacking. It is a powerful tool and in case, not used properly, it may lead to losses even.


The most famous Kali Linux tools:

Kali Linux – Exploitation Tools


After Scanning, information Gathering, and finding a vulnerability comes the main concept of hacking which is Exploitation of the vulnerability. Vulnerability is not that effective if it can not be exploited or it could not cause harm to the application, So in order to get the impact of the vulnerability, we have to exploit also in many cases we have to take down a hacker’s or a spammer’s website. So we have to find a vulnerability on the website and have to exploit it. Kali Linux comes packed with 300+ tools for cybersecurity and penetration testing out of which many of the tools are used to exploit these vulnerabilities, a few of them are listed below.

1. Metasploit

Metasploit Framework is basically a penetration testing tool that exploits the website and validates vulnerabilities. This tool contains the basic infrastructure, specific content, and tools necessary for penetration testing and vast security assessment. Metasploit Framework is one of the most famous exploitation frameworks and is updated on a regular basis. It can be accessed in the Kali Whisker Menu and launched directly from the terminal. Also here, new exploits are updated as soon as they are published. It contains many tools that are used for creating security workspaces for vulnerability testing and penetration testing systems. It was designed by rapid7 LLC and is completely open-source software and is easy to use. To use Metasploit:

  • Metasploit comes pre-installed with Kali Linux
  • Just enter “msfconsole” in the terminal.

2. BeEF

BeEF or Browser Exploitation Framework is basically a penetration testing tool that runs and gets executed on the web browser. It also allows professional penetration testers to use client-side attack vectors to assess the actual security posture of a target environment. This tool mainly focuses on the Web Browser. It hooks web browsers in order to use them as a base or launchpad to attack the system and execute the malicious codes and payloads. To use BeEF, enter the following command in the terminal.

3. Armitage

Armitage is a tool that is used to visualize targets, recommend exploits, and expose exploitation features in the framework. Armitage is basically a scriptable red team collaboration tool for the Metasploit framework in other words it is a GUI version of the Metasploit framework. It contains many tools that are used for creating security workspaces for vulnerability testing and penetration testing systems. Being a GUI-based package, it is a good alternative to Metasploit. To use Armitage, enter the following command in the terminal.

4. SQLMap

SQLMap is an open-source tool that is used to automate the process of manual SQL injection over a parameter on a website. It detects and exploits the SQL injection parameters itself all we have to do is to provide it with an appropriate request or URL. It supports 34 databases including MySQL, Oracle, PostgreSQL, etc. To use sqlmap tool:

  • sqlmap comes pre-installed in Kali Linux
  • Just type sqlmap in the terminal to use the tool.

5. aircrack-ng

Aircrack is an all-in-one packet sniffer, WEP and WPA/WPA2 cracker, analyzing tool, and a hash capturing tool. It is a tool used for wifi hacking. It helps in capturing the package and reading the hashes out of them and even cracking those hashes by various attacks like dictionary attacks. It supports almost all the latest wireless interfaces. To use aircrack-ng, enter the following command in the terminal.

Best Kali Linux tools for penetration testing:


Kali Linux is a Linux based operating system, mostly used in penetration testing. Kali.org has recently released its new update with some extra functionalities. There are different types of tools that are present in Kali Linux to perform different operations. 

Types of tools in Kali Linux

  • Information Gathering
  • Vulnerability Analysis
  • Web Application Analysis
  • Database Assessment
  • Password Attacks
  • Wireless Attacks
  • Reverse Engineering
  • Exploitation Tools
  • Sniffing and Spoofing
  • Post Exploitation
  • Forensics
  • Reporting Tools
  • Social Engineering Tools

1. Information Gathering:

These software or applications have a job of collecting and formatting the data in a form that could further be used. This is similar to cookies used by different websites or your browsing history used by Google to personalize every advertisement and providing the best services to you. Kali operating system provides these tools to the developer and penetration testing community to help in gathering and formulating captured data. Some of the tools are:

  • Nmap
  • Zenmap
  • Stealth scan
  • dmitry
  • maltego

Nmap is the most famous in these tools. Go to “Applications” then in “Information Gathering”, you will find these tools.

2. Vulnerability Analysis:

Vulnerability is a state or condition of being exposed to the possibility of being attacked or harmed in one or the other way. These tools are used to check a system or machine for any kind of flow and vulnerability available in them, which could lead to any security breach and data loss. These tools also help in fixing those vulnerability as identification make the user aware of the flow. For example: If windows release its new operating system, before providing it into the end-user they send for vulnerability analysis and fixes. Some of the tools:

  • Bed
  • Ohrwurm
  • Powerfuzzer
  • Sfuzz
  • Siparmyknife
  • nikto

All these tools are very common in the community. Go to “Applications” then in “Vulnerability Analysis”, you will find these tools.

3. Web Application Analysis:

Web Application is a dynamic response web page that helps in a better and interactive client-server relationship. These tools identify and access websites through the browser to check any bug or loophole present, which could lead any information or data to lose. For example, there is a website with a payment gateway then these web analyzers check if sufficient authentication and authorization present of the site. These web application uses:

  • SQL injections
  • Denial of service
  • URL manipulation

Some of the tools are:

  • Burpsuite
  • Httrack
  • Sqlmap
  • Vega
  • Webscarab
  • Wpscan
  • zap
  • skipfish

Burpsuite, vega, and web scarab are some most famous tools. Go to “Applications” then in “Web Application Analysis”, you will find these tools.

4. Database Assessment:

These applications are made to access the database and analyze it for different attacks and security issues. These assessment shows some opportunities for improvement and changes. They develop a report of the analysis done on the database system. They perform:

  • Configuration checking
  • Examining user account
  • Privilege and role grants
  • Authorization control
  • Key management
  • Data encryption

Some of the tools are:

  • Bbqsl
  • Jsql injection
  • Oscanner
  • Sqlmap
  • Sqlninja
  • Tmscmd10g

Sqlmap is the most famous database assessment tool. This tool injects SQL injection for scanning, detecting, and exploitation. Go to “Applications” then in “Database Assessment”, you will find these tools.

5. Password Attacks:

These are basically a collection of tools that could handle the wordlist or password list to be checked on any login credentials through different services and protocols. Some tools are wordlist collectors and some of them are the attacker. Some of the tools are:

  • Cewl
  • Crunch
  • Hashcat
  • John
  • Johnny
  • Medusa
  • ncrack

John the Ripper and Medusa are the most famous tools. Go to “Applications” then in “Password Attacks”, you will find these tools.

6. Wireless Attacks:

These tools are wireless security crackers, like breaking wifi – routers, working and manipulating access points. Wireless attacks are not limited to password cracking these are also used in information gathering and knowing behavior of victims over the internet. For example, the Victim is connected to a compromised access point or a fake access point then it can be used as a Man-in-The-Middle attack. Some of the tools are:

  • Aircrack-ng
  • Fern- wifi –cracker
  • Kismet
  • Ghost Phisher
  • wifite

Aircrack-ng and Ghost Phisher are the most famous tools. Go to “Applications” then in “Wireless Attacks”, you will find these tools.

7. Reverse Engineering:

Reverse Engineering is to break down the layers of the applications or software. This is used in creating cracks and patches for different software and services. These tools reach the source code of the application, understand its working and manipulate according to needs. For example, Reverse engineering tools are also used by High-End companies to know the logic and idea behind the software. Some of the tools are:

  • Apktools
  • Ollydbg
  • Flasm
  • nasm shell

Most famous tools are ollydbg and apltools. Go to “Application” then in “Reverse Engineering”, you will find these tools.

8. Exploitation Tools:

These tools are used to exploit different systems like personal computers and mobile phones. These tools can generate payloads for the vulnerable system and through those payloads information from the devices can be exploited. For example, the Victim’s system is compromised using payloads over internet or installing it if physically accessible. Some of the tools are:

  • Armitage
  • Metasploit
  • Searchsploit
  • Beef xss framework
  • termineter
  • Social engineering toolkit(root)

The most famous tool is Metasploit (there are courses to learn Metasploit alone). Go to “Applications” then in “Exploitation Tools”, you will find these tools.

9. Sniffing and Spoofing:

Secretly accessing any unauthorized data over network is sniffing. Hiding real identity and creating fake identity and use it for any illegal or unauthorized work is spoofing. IP spoofing and MAC spoofing are two famous and mostly used attacks. Some of the tools are:

  • Wireshark
  • Bettercap
  • Ettercap
  • Hamster
  • Driftnet
  • responder
  • macchanger

The most used tool is Wireshark. Go to “Applications” then in “Sniffing and Spoofing”, you will find these tools.

10. Post Exploitation:

These tools use back doors to get back to the vulnerable system i.e. to maintain access to the machine. As the name suggests these are useful or mostly used after an attack has previously been made on the victim’s machine. For example, After an attack victim removed the vulnerability from the system, in this situation if attacker wants to access data again, then these tools are helpful. Some of the tools are:

  • MSF
  • Veil –Pillage framework
  • Powersploit
  • Powershell empire

The most famous tool is Powersploit. Go to “Applications” then in “Post Exploitation Tools”, you will find these tools.

11. Forensics:

These tools are used by forensic specialist to recover information from any system or storage devices. This helps in collecting information during evidence searching for any cybercrime. Some of the tools are:

  • Autopsy
  • Binwalk
  • Galleta
  • Hashdeep
  • Volafox
  • Volatility

The most famous tool is Autopsy, it has also been used by security forces, many judicial and investigating officials. Go to “Applications” then in “Forensics”, you will find these tools.

12. Reporting Tools:

After all the assessment and vulnerability testing analysts have to report all those to the client in an organised and authenticated way. These tools develop statistics and information to help in analysing. Some of the tools are:

  • Dradis
  • Faraday IDE
  • Pipal
  • Magictree
  • metagoofil

Most famous tools are faraday, Dradis, and Pipal. Go to “Applications” then in “Reporting Tools”, you will find these tools.

13. Social Engineering:

As the name suggests these tools generate similar services that people use in daily life and extract personal information using those fake services. These tools use and manipulate human behavior for information gathering. For example, Phishing is one of the example of social engineering, in this, a similar looking home page of any social platform is created and then login details are compromised. Some of the tools are:

  • SET
  • Backdoor-f
  • U3-pwn
  • Ghost Phisher
  • msf payload creator
  • SET(social engineering toolkit)

The most famous social engineering tool is SET. Go to “Applications” then in “Social Engineering Tools”, you will find these tools.

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