DDoS attack, what is it?
A DOS (Denial Of Service) attack is an attack on a computer system or network that makes a service or resource inaccessible to users. It usually results in a loss of network connection due to bandwidth consumption by the attacked network or resource overload.
A DDOS (Distributed Denial of Service) attack is a variant of the DOS attack that is generated through a large flow of information from several points of connection to the same destination, thus disabling an infrastructure, a server or a service.
How a DDOS attack works
Web servers have a maximum number of requests to be processed simultaneously and the channel through which the server connects to the Internet has a limit on bandwidth.
When the number of requests to be processed exceeds the limits, the service is affected where problems are reflected through abnormally slow response to requests or through ignoring some or all of the users' requests.
In general, the intention of the attacker is to render the victim's services non-functional, i.e. to deny service.
Using a Botnet for the DDOS
The attackers use a zombie army or also called a botnet (a large number of computer equipment that is hijacked through malware and which, today present as one of the main threats of the Internet) for the massive sending of requests to web servers.
To prevent the computer from becoming one of the infected computers, users should have powerful antivirus software installed and be careful where they click. In the event that the computer has been infected, it would be enough to remove the malware from the computer to stop it from being one of the computers that make up the botnet.
DDOS attacks in 2019
According to the company KasperskyDuring the second quarter of 2019, the longest DDOS attack to date was recorded, counting 509 hours. Kaspersky has been monitoring the botnets since 2015, with the longest attack before 2019 - one that lasted 329 hours in the previous year.
According to Kaspersky's DDoS Q2 2019 report, the total number of DDoS attacks increased by 18% over the same period in 2018. Attacks on the application layer, which are more difficult to organize and protect against, increased by 32% and now constitute almost half (46%) of all attacks stopped by Kaspersky DDoS Protection. Kaspersky.