Ddos Attacking Tool
Leda Billock
Step 4: Now you have to clone the Slowloris tool from Github so that you can install it on your Kali Linux machine. For that, you only have to type the following URL in your terminal within the Slowloris directory that you have created.
Step 11: You can see the tool has started attacking that particular IP address which we have given now to check whether its working or not go to your browser and on your URL bar type that IP address, and you will see the site is only loading and loading but not opening this is how Slowloris tool works.
DoS (denial of service) is a type of attack in which a threat actor sends bogus traffic to the targeted entity. The target is unable to distinguish between the attack traffic and legitimate traffic and ends up exhausting its resources towards attack traffic. This way the legitimate traffic gets denied of the resources rendering the target useless.
The attackers try to make the attack sophisticated by making the requests/traffic seem like normal traffic and making the frequency and source of traffic random.
e.g. if a website can handle 100 people/second clicking the signup button, an attacker only has to send 100 fake requests/second to make it so no legitimate users can sign up. This kind of attack can easily be controlled by blocking the IP etc. but when this is launched through a lot of different sources, mostly compromised PCs, this is called distributed denial of services or DDoS. This is tough to detect and block as the attacking sources are distributed among the legitimate users.
The attackers send large volume of traffic/packets/requests to the target thus eating up all the resources. The requests choke the bandwidth and cause denial to other requests. Includes flooding attacks (ICMP and UDP).
Here the attacker targets the resources apart from bandwidth. The target here is servers, firewalls, IPS, other network equipment etc. The traffic is continuously processed leading to denial of services for legitimate requests.
Common attack types: - NTP amplification, Smurf attack, Fraggle attack, SYN floods, Ping of death etc.
These attacks are comprised of what appears to be legitimate application layer. ( layer 7) It sends requests to the server that are intended to crash/overflow it. The attackers can either overflow the application server with a large amount of requests or either block the resources of the server by sending extremely slow incomplete requests thus letting the sever wait for the complete request.
DDoS attacks can be performed for various reasons explained above and are also performed by different set of people. The tools for this attack can either be written by the user as per need or are downloaded. Nowadays, DDoS is also available as a service offered by groups in the black-market. As per your subscription (e.g. 25Mbps/s on a particular target) DDoS attacks will be performed (Here's a resource that will navigate you through cyber security attacks).
DoS script will bring down the application or a particular target whereas a DDoS toolkit will try to compromise the network and create zombies. These zombies can be used to launch DDoS programs or other attack campaigns.
From an organisational perspective, attacks from a dos script can be easily detected and blocked as they are mostly launched from a single source but the real threat lies from ddos botnets. This does not mean that the attacks from dos tools are not harmful, the scripts are enough strong to bring down a medium size vulnerable application server.
DDoS toolkits are specifically designed so that the compromised systems can be used to launch DDoS attacks and further create zombies. This becomes difficult to detect as the source is not one, the traffic seems to be legitimate and the systems are getting compromised. If the system gets compromised then there is a need to check for both outbound as well as inbound attacks.
Open source DDoS tool which can easily perform TCP, UDP and HTTP DoS attacks. It has fairly simple GUI, the user just needs to know the target address/URL of the website and the attack which needs to be executed.
Connecting, Requesting and Downloading: No of threads trying to connect to the target, No of threads connected to the server and now requesting for information or resources, No of threads which have started some download from the target after connecting and requesting
This is a successor of LOIC and is again an open source DoS tool capable to attack 256 targets simultaneously. The attacking mechanism is same, it generates a large number of junk HTTP GET and POST request to overload the application server. The GUI is way too simple,
Unlike flooding the server with a lot of requests, RUDY executes slow rate attacks. It detects if the website has any form field submissions. Upon identification, it sends a legitimate HTTP POST request with a long 'content-length' header field (prevents server from closing the connection) and then starts injecting the form with data, 1 byte at a time and that too at a slow rate (large time intervals between subsequent bytes). This causes a lack of application resources at the server thus denying legitimate requests.
Slowloris is also a slow DoS attack script like RUDY. It sends HTTP GET request to the server but the request is not complete. Web server will wait for the request to complete and the resources are allocated. Parallel to this multiple threads of this kind are opened and thus the resources of the web server are exhausted. The attack script is also present in NMAP for testing the response of the webserver to the attack scenario.
The main highlight of this tool is its capability to generate unique requests. The tool uses obfuscation techniques to generate unique requests. This helps in evading the conventional controls which can detect and block the abnormal traffic. This works well when you have behavioural analysis present in your network.
This tool is used to simulate a real world DDoS attack on both a website and network. The tool is written in C++ and has the capability to simulate the attack as if it is coming from a botnet by faking random IP addresses.
The tool has been created by ProactiveRISK for the OWASP(Open web application security project) to create awareness about application layer attacks. The tool is also used to do a performance testing and capacity planning of a webserver.
GoldenEye is a layer 7 DoS tool which has been developed in python. The tool tries to persist a socket connection by exploiting Keep-Alive and No Cache. This consumes all the HTTP/S sockets on the application server and thus causing DoS.
One very poor and expensive way is to beef up the server farm infrastructure to handle large no of requests and get a bigger bandwidth. This will handle both DDoS script attacks and volumetric attacks (also consider checking this perfect guide for cyber security certification).
Set a threshold: Analyse your website over a period of time for the no of requests it experiences and the rate can be set accordingly, a buffer can be added in this for peak hours and low request times.
Blocking the IP: Not a very good way since DDoS will have multiple sources and you might end up blocking the entire internet and blocking legitimate IP/user as well. Acceptable and practical upto a certain level.
DoS attacks have been in news every now and then, the result is mostly unavailability of the websites or other services. It affects both business and reputation. The art of the attack lies in how to evade attack detection and blocking tools and reach the target with bogus requests. Since attackers are coming up with new tools and techniques to achieve this, organisations need to update themselves with the attacks, trends and mitigation strategies. If the mitigation strategies fail there must be an incident management plan in place.
For a CEH, you are expected - to know the attacks in theory and practical is very important. They are required to monitor and dissect the traffic to ensure that their actions do not block legitimate users. For this, they should have a clear understanding of how the attack tools work, their traffic patterns and impact they can have on the organisation if not detected on time. If you are about to give the exam, ensure that you are ready with the attack concepts, working of various tool and other concepts like zombies, DDoS toolkits etc.
A Denial of Service (DoS) attack is designed to cause service outages. These attacks can easily cost an organization a significant amount in damages and wasted resources, even if the attacker does not demand a ransom to stop the attack. A number of different free DDoS tools exist, making it cheap and easy for even unsophisticated attackers to use this attack technique.
A DoS attack is any attack that is designed to take a system offline or make it unavailable to legitimate users. The goal of the attack could be to hurt the target organization, extort a ransom to allow services to be restored or cover up another attack.
DoS attacks can take advantage of a number of different vulnerabilities within a computer system. Buffer overflow vulnerabilities and other programming flaws can be exploited to cause a segmentation fault or other error that causes a program to crash.
However, the most common method of performing a DoS attack is to take advantage of bottlenecks within a computing system. Every component of a system has a maximum amount of traffic, data, connections and so on that it is capable of processing, and the entire system is limited by the component with the lowest threshold. Most DoS attacks are designed to exceed this maximum capacity, making it impossible for the system to process legitimate user requests.
Distributed DoS (DDoS) attacks are designed to ensure that the target is overwhelmed by taking a many-to-one approach to the attack. Instead of using a single machine to perform an attack, the attacker uses a botnet.
This botnet is composed of many attacker-controlled machines, including compromised computers, leased cloud infrastructure and more. Each of these machines is instructed to send some traffic to the target service. By taking advantage of its greater numbers, a DDoS botnet can take down any unprotected service, even if the target has more network bandwidth and better computers than the attacker.
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