DoS Attack – Tools and Techniques


DoS stands for Denial of Service. As the name suggests it denies the access to e-services offered by an organization. During a DoS attack the target is flooded with huge number of rogue requests denying access to legitimate users. DoS attacks takes advantage of a number of different vulnerabilities of a selected target. The objective of a DoS attack by a bad actor is to cause damage to an organization and cause downtime. The characteristics of a DoS attack is that it is launched by a single source. A DoS attack takes advantage of an inherited vulnerability in the communication architecture of computer systems – TCP/IP. Click here to learn more details about DoS Attack.

With great power comes great responsibility !

____Uncle Ben Spider-man.

NOTE: The tools mentioned here are only for educational purpose and are to be used in controlled lab environments only. We do not promote the use of such tools for criminal activities.

DoS attacking Tool

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It’s possible for an attacker to write custom software to perform a DoS attack or malware to perform a DDoS attack. Many DDoS websites offer DDoS-as-a-Service. For penetration testers wishing to perform their attacks independently but don’t want to write their own tools, a number of free DoS attack tools exist and available over the internet. We are trying to build a list of free DoS attack tools.

  1. LOIC (Low Orbit Ion Cannon)

LOIC is one of the most popular DoS attacking tools freely available on the internet. The famous hacking group Anonymous has not only used the tool, but also requested internet users to join their DDoS attacks via IRC.

LOIC can be used by a single user to perform a DoS attack on small servers. This tool is really easy to use, even for a beginner. This tool performs a DoS attack by sending UDP, TCP or HTTP requests to the victim server. You only need to know the URL or IP address of the server, and the tool will do the rest.

You can see a snapshot of the tool above. Enter the URL or IP address, and then select the attack parameters. If you are not sure about what settings to use, you can leave the defaults. When you are done with everything, click on the big button saying “IMMA CHARGIN MAH LAZER”, and it will start attacking the target server.

This tool also has a HIVEMIND mode. It lets attackers control remote LOIC systems to perform a DDoS attack. This feature is used to control all other computers in your zombie network. This tool can be used for both DoS attacks and DDoS attacks against any website or server.

The most important thing you should know is that LOIC does nothing to hide your IP address. If you are planning to use LOIC to perform a DoS attack, think again. Using a proxy will not help you because it will hit the proxy server not the target server. This tool should only be used for testing the resiliency of your own systems against DoS and DDoS

    2. XOIC

XOIC is another nice DoS attacking tool. It performs a DoS attack against any server if the user can provide an IP address, a target port, and a protocol to use in the attack. Developers of XOIC claim that XOIC is more powerful than LOIC in many ways. Like LOIC, it comes with an easy-to-use GUI, so a beginner can easily use this tool to perform attacks.

In general, the tool comes with three attacking modes. The first one, known as test mode, is very basic. The second is normal DoS attack mode. The last one is a DoS attack mode that comes with a TCP/HTTP/UDP/ICMP Message.

Download XOIC here.

    3. HULK (HTTP Unbearable Load King)

HULK is another nice DoS attacking tool that generates a unique request for each and every request to the web server, making it more difficult for the server to detect patterns within the attack. This is only one of the ways in which HULK eliminates patterns within its attacks.

It has a list of known user agents to use randomly with requests. It also uses referrer forgery and can bypass caching engines; thus, it directly hits the server’s resource pool.

Download HULK here.

    4. DDoSIM — Layer 7 DDoS Simulator

DDoSIM is another popular DoS attacking tool. As the name suggests, it is used to perform DDoS attacks by simulating several zombie hosts. All zombie hosts create full TCP connections to the target server.

This tool is written in C++ and runs on Linux systems.

These are main features of DDoSIM

  • Simulates several zombies in attack
  • Random IP addresses
  • TCP-connection-based attacks
  • Application-layer DDoS attacks
  • HTTP DDoS with valid requests
  • HTTP DDoS with invalid requests (similar to a DC++ attack)
  • TCP connection flood on random port

Download DDoSIM here.

Read more about this tool here.

    5. R-U-Dead-Yet

R-U-Dead-Yet is a HTTP POST DoS attack tool. For short, it is also known as RUDY. It performs a DoS attack with a long form field submission via the POST method. This tool comes with an interactive console menu. It detects forms on a given URL and lets users select which forms and fields should be used for a POST-based DoS attack.

Download RUDY here.

    6. Tor’s Hammer

Tor’s Hammer is a nice DoS testing tool written in Python. It performs slow-rate attacks using HTTP POST requests.

This tool has an extra advantage: It can be run through a TOR network to be anonymous while performing the attack. It is an effective tool that can kill Apache or IIS servers in a few seconds.

Download TOR’s Hammer here.

    7. PyLoris

PyLoris is said to be a testing tool for servers. It can be used to perform DoS attacks on a service. This tool can utilize SOCKS proxies and SSL connections to perform a DoS attack on a server. It can target various protocols, including HTTP, FTP, SMTP, IMAP and Telnet.

The latest version of the tool comes with a simple and easy-to-use GUI. Unlike other traditional DoS attacking tools, this tool directly hits the service.

Download PyLoris here.

    8. OWASP Switchblade (formerly DoS HTTP POST)

OWASP Switchblade is another nice tool to perform DoS attacks. You can use this tool to check whether or not your web server is able to defend against DoS attacks. Not only for defense, it can also be used to perform DoS attacks against a website during a Red Team exercise.

Download Switchblade here

    9. DAVOSET

DAVOSET is yet another nice tool for performing DDoS attacks. The latest version of the tool has added support for cookies along with many other features. You can download DAVOSET for free from Packetstormsecurity.

Download DavoSET here.

   10. GoldenEye HTTP Denial of Service Tool

GoldenEye is another simple but effective DoS attacking tool. It was developed in Python for testing DoS attacks.

Download GoldenEye here.

This sum’s up our pick of DoS attacking tool. Once again on the closing note, the list is populated only for educational purpose, use these tools only in controlled lab environments or after acquiring consent if you are performing pen test. Use these tools cautiously and carefully. Providing this information we do not promote the use of these software’s for criminal activity nor liable for any consequences or financial loss incurred.

If unsure or have any doubts write to us or contact the system or network administrator to understand more about the nature of these software’s. Thanks for your time and happy e-learning

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