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A distributed denial-of-service (DDoS) attack sends massive volumes of traffic to a network, server, or system until it becomes nonfunctional. A DDoS attack is a subcategory of a denial-of-service (DoS) attack. But instead of only having one source, a DDoS attack uses multiple sources to execute its assault.
The goal is simple: Send so much traffic that the system becomes paralyzed by it. But the motivations of the cybercriminal can vary. Here are a few reasons why DDoS attacks are used:
Regardless of why hackers implement DDoS attacks, you can be affected once you are blocked from accessing important information online and even your personal accounts. Keep reading to learn more about how DDoS attacks work and what can be done to mitigate and prevent them.
Let's use an online store as an example. It receives orders, gets payments, packages items, and then ships them out. But what happens when someone calls and makes a fake order with more than 100 items? You spend all your time and resources getting this shipment ready only for the person to not pick it up.
This is already an annoying problem, but imagine if you were getting several calls requesting large orders a day and you couldn't tell the difference between authentic orders and prank orders. You may end up breaking down and not getting anything productive done. This is essentially what happens to network resources when a DDoS attack is executed.
Cybercriminals use botnets to send a large number of requests to the targeted infrastructure. Botnets are a group of malware-infected computers, known as bots, that are controlled by a hacker.
The DDoS attack is practically automated thanks to botnets. The hacker can issue an order for botnets to send repeated requests until a server is too overwhelmed to function properly.
This can be fairly effective because botnets may pose as legitimate users with their own internet protocol (IP) addresses. Servers may not immediately recognize the threat and interact with them. It can also be difficult for information technology (IT) professionals to sort out the botnets from legitimate users for this reason.
There are several types of DDoS attacks. Although they all accomplish the goal of overwhelming and paralyzing a server, they all do so in slightly different ways. DDoS attacks usually fall into three categories: application layer attacks, protocol attacks, and volumetric attacks.
Cybercriminals often will use a mix of these attacks to make it more complicated for IT security professionals to respond. Let's dive into each of these attack vectors and see how they work.
So you enter the URL of a specific webpage into your browser. The application layer is the server responding to the HTTP request to see that page.
An application layer attack focuses on the response and sends multiple requests to consume disk space and available memory. Because the attack stems from various IP addresses, it can be difficult for the server to recognize it's under attack.
Protocol attacks focus on the transactions between web servers with malicious connection requests. The idea is to overwhelm the targeted server and exhaust the processing capacity, firewalls, routing engines, and load balancers. Some of the protocols that get targeted include:
One way to execute a protocol attack is to send fraudulent SYN packets, known as a SYN flood attack. The TCP conducts a connection between the sender (SYN packets) and the receiver (SYN-ACKs).
It starts with a cybercriminal sending fraudulent SYN packets to start the connection. The targeted server responds by sending SYN-ACKs and waits for the connection request to be completed. But because the attack leaves the targeted server hanging, it leads to the server using too much space for the connection requests and eventually crashing.
It's like if someone asks you for a high-five but then moves their hand away at the last second and doesn't complete the high-five with you.
Imagine you are driving and then an unannounced parade started blocking the roads. This creates a traffic jam, so you can no longer drive your car down the road.
This is basically what happens to users with volumetric attacks. As the name implies, it sends massive amounts of attack traffic to a server to exhaust the bandwidth. Because the server is overcrowded, it can't allow authentic requests through.
An example is domain name system (DNS) amplification attacks. A cybercriminal spoofs the target's IP address by impersonating the real server. Then it sends requests to the DNS server. The DNS server then responds but sends the data to the real IP address. The goal is to overwhelm the target server with requests it didn't ask for.
There are several signs that can identify a DDoS attack. Some of these red flags include:
One of the reasons why DDoS attacks are particularly hard to respond to is that the source is from multiple IP addresses. It makes it harder to identify who is sending fraudulent requests and who is sending authentic requests.
You may want to contact your internet service provider (ISP) to get help filtering traffic. This may mean legitimate traffic gets denied too, but it's difficult to separate the authentic users from botnets. Here are three ways to respond to DDoS attacks:
Responding to a DDoS attack is costly and time-consuming. It's much more effective to prepare yourself against a DDoS attack and prevent the attack from happening in the first place.
Another potential DDoS threat is having a hacker infect your device and make it part of their botnet. A cybercriminal may be able to make your device part of their botnet in a variety of ways. Maybe you clicked on a suspicious link online and downloaded malware. Another possibility is that you were sent a phishing email and got tricked into a malware installation.
Luckily, it's possible to tell if your device is part of a botnet. You can run your antivirus software, and it should be able to detect botnet malware. Once detected, you can delete the infected files and start recovering from the cyberattack.
Preventing a DDoS attack is well worth the effort because it's difficult to stop a DDoS attack once it's infiltrated your infrastructure. There are several tools you can implement to create a multilayered cybersecurity and DDoS mitigation strategy. Here are a few tools to consider:
The difference between a distributed denial-of-service (DDoS) and a denial-of-service (DoS) attack is the number of malicious sources making a flood of requests. A DDoS attack uses botnets and has several sources, whereas a DoS attack only has one source.
An example of a DDoS attack recently occurred when Google fended off the largest DDoS attack to date. The application layer attack peaked at 46 million requests per second. An early warning system gave Google time to mitigate the DDoS attack and prevent it from breaching the infrastructure.
On average, DDoS attacks lasted roughly 50 hours in the second quarter of 2022, according to Securelist. However, 95.24% of DDoS attacks in the same period were considered “very short” or under four hours in duration. DDoS attack durations can vary depending on the hacker.
A distributed denial-of-service attack is stressful for companies and internet users. Companies risk losing access to their website and infrastructure. Meanwhile, internet users can't access online services. They may also find themselves in a position where their devices are being used as part of a botnet.
There are plenty of cybersecurity tools to use to protect yourself from DDoS attacks and reduce exploitable vulnerabilities. VPNs reduce your exposure to DDoS attacks because it masks your real IP address. Antivirus software and firewalls can detect malicious traffic and files. The key is to use these tools consistently and ensure they are updated regularly, so you can have a strong cybersecurity system.
Staying safe online requires proactive measures. Learn more about the benefits of VPNs, creating strong passwords, and why antivirus software is necessary to protect you from cybercrimes.
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