What is DDoS Attack and How Does It Happen?

DDoS attacks, one of the greatest weapons of hackers, are becoming more prevalent and accessible enough for a non-expert hacker to perform. We have answered the questions of what DDoS attack is for you, how it happens, and what it is doing to protect the network at the time of the attack.


The era we live in is called the age of cyber, technology, or the internet. When this is the case, primitive acts such as violence and attack also appear with their versions in the cyber world. Among these attacks, DDoS attacks are one of the most common and effective ones. So, what is a DDoS attack? What does it do?


In short, a DDoS attack is a cyberattack that is planned to render a website server inoperable. These attacks are so well designed that sometimes even the server under attack cannot immediately understand the situation.


What is a DDoS attack?


Distributed Denial of Service, i.e., "distributed denial of service" or DDoS attack for short; It is a type of cyber attack that focuses on a single target from many different sources and aims to disrupt the traffic flow of the target server, network or service. Data such as the number of requests to be received by each system, the number of users are predetermined. DDoS attacks cause applications that are much more than this predetermined capacity to the server, causing them to malfunction and even crash with the continuation of the attack.


For example, 100 people getting on or trying to get on a 10-person minibus can be thought of as vehicles that will set out from the side road to the main road, being exposed to abnormal traffic and not being able to move forward. In other words, targets are forced to serve beyond their capacity, and as a result, they are out of service.


What does a DDoS attack do?



Although it is one of the types of malicious attacks, experts do justice to the DDoS attack and say it is one of the most successful examples of cyberattacks ever designed because it's attacking a point that many people don't think of, the end of accessibility.


If there is an attack for direct hijacking or redirecting the IP address to another point, it will hang on the server's firewall, and the attack can be terminated as it started. However, the attack that comes with the mask of organic users visiting the site manages to remain hidden until it takes effect.


This is what makes DDoS attacks effective. Firewalls belonging to the server do not understand the offense. What if the site suddenly became popular rather than this attack? This situation also makes it difficult to resist the attack and take precautions.


How does a DDoS attack happen?


DDoS attacks, which are defined as attacks from many different sources targeting a single target, are not done by thousands of people. Computers captured by an only person or group are directed remotely to a single goal during the attack.


If you are not careful, every user's computer can be a DDoS attack soldier. The system is simple; malicious software infects your computer as a result of carelessness. Sneakily stored on your computer, this software starts running during the DDoS attack and directs your computer to the target.


The strength of the DDoS attack comes from these organic users. Perhaps thousands of seized computers visit the website as organic visitors. As a result of massive requests, servers lose their accessibility and become entirely out of service, depending on the strength of the attack.


What is targeted by DDoS attacks?


Layer 7 Attack: Attacks the layer that responds to HTTP requests and consumes the attack target's resources.

HTTP Flood: Fills the server with HTTP requests that are way over the capacity and results in a denial of service.

State Exhaustion Attack: Attacks middle layers such as web application server, firewall, load balancer, and results in service interruption.

SYN Seli: Consecutively sending SYN, i.e., the first connection request, a service failure occurs, and no request reaches a result.

Volumetric Attack: It attacks the connection between the target server and the internet network, resulting in bandwidth exhaustion.

DNS Raise: A DNS server is created where the target IP address will receive a response with an unfamiliar amount of data, resulting in the IP address being out of service.


DDoS attacks aim to block the accessibility of the target server and are done in the same way. However, there are some subtypes of these cyber attacks. The reason for the formation of subtypes is that each attack reaches another layer of the network and tries to conclude.


What is done against DDoS attacks?


Of course, there are many technical details that only experts on the subject will be able to master. However, you can think of the measures taken against DDoS attacks as controlling the water after the flood. Although the attack power is not decreased, it is directed to a different point. With a measure called redirection to the black hole, the requests that strangle the website's server are directed to a black hole without stopping. Thus, the attack is tried to be avoided without taking any damage to the server.


With the rate-limiting method, the number of requests to be received in a specific period is limited. With a firewall named WAF, incoming requests are filtered, and every application is prevented from reaching the server. Both methods aim to minimize the possibility of a possible attack without missing potentially organic claims.


With the Anycast network spreading method, the power of incoming attacks is reduced before reaching the server. You can think of it as canals opening to the side of a rapidly flowing river. As a result, it cannot be stopped because there are multiple sources of attack, so only the attack is prevented from reaching the server directly, or its power is reduced.


We have answered questions such as what is DDoS attack for you, what is it for, what is done during the attack, and explained the details about the subject. If you don't want your computer to be a veteran of a DDoS attack, protect your computer from malware with a powerful antivirus program.

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