How to Effectively Prevent DDoS Attack?

What is HTTP Flood DDoS attack?

HTTP flooding attack is a volumetric distributed denial of service (DDoS) attack designed to overwhelm the target server with HTTP requests.

Once the target has satisfied the request and cannot respond to regular traffic, a denial of service will occur for other requests from actual users.

How does the HTTP Flood attack work?

HTTP flood attack is a "layer 7" DDoS attack. The 7th layer is the OSI model's application layer, referring to Internet protocols, such as HTTP. HTTP is the basis of browser-based Internet requests and is usually used to load web pages or send form content via the Internet. Mitigating application layer attacks is particularly complicated because malicious traffic is difficult to distinguish from normal traffic.

To achieve maximum efficiency, malicious actors usually use or create botnets to maximize their attacks' impact. By using many devices infected with malware, attackers can exploit their efforts by launching a more massive amount of attack traffic.

There are two varieties of HTTP flood attacks:

HTTP GET : Multiple computers or other devices are coordinated to send numerous requests for images, files, or some other assets from the target server in this form of attack. When the target is overwhelmed by incoming requests and responses, other requests from legitimate traffic sources will undergo service denial.


HTTP POST : Usually, when a form is submitted on a website, the server must process the incoming request and push the data to the persistence layer, usually a database. Compared with the processing power and bandwidth required to send POST requests, the process of processing form data and running the necessary database commands is relatively intensive. This attack takes advantage of the difference in relative resource consumption by sending many publishing requests directly to the target server until its capacity is saturated, and a denial of service occurs.

Imitation Flood Attack (tool ZAmbIE)

Download and Install

git clone https://github.com/zanyarjamal/zambie.git

cd zambie/

chmod +x Installer.sh

./Installer.sh

chmod +x zambie.py

./zambie.py

It can be seen that the author has written a DOS module now, and more modules should be added later.

Enter 1

Select 2

Select 1

After entering the domain name and press Enter, the attack will begin. Thus we need to know how to stop the attack ASAP!

As mentioned earlier, mitigating layer seven attacks is complex and usually multifaceted. One method is to challenge the requesting machine to test whether it is a robot, just like the verification code test, when creating an account online. Many attacks can be mitigated by providing requirements such as JavaScript computing challenges.

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How to Effectively Prevent DDoS Attack?