DDoS attacks defined

A DDoS attack targets websites and servers by disrupting network services in an attempt to exhaust an application’s resources. The perpetrators behind these attacks flood a site with errant traffic, resulting in poor website functionality or knocking it offline altogether. These types of attacks are on the rise.

DDoS attacks are wide-reaching, targeting all sorts of industries and company sizes worldwide. Certain industries, such as gaming, ecommerce, and telecommunications, are targeted more than others. DDoS attacks are some of the most common cyberthreats, and they can potentially compromise your business, online security, sales, and reputation.

How DDoS attacks work

During a DDoS attack, a series of bots, or botnet, floods a website or service with HTTP requests and traffic. Essentially, multiple computers storm one computer during an attack, pushing out legitimate users. As a result, service can be delayed or otherwise disrupted for a length of time.

It’s possible that hackers can also infiltrate your database during an attack, accessing sensitive information. DDoS attacks can exploit security vulnerabilities and target any endpoint that is reachable, publicly, through the internet.

Denial-of-service attacks can last hours, or even days. These cyber assaults can also cause multiple disruptions throughout a singular attack. Both personal and business devices are susceptible to them.

Types of DDoS attacks

There are several types of DDoS attacks. DDoS attacks fall under three primary categories: volumetric attack, protocol attack, and resource layer attack.

A volumetric attack overwhelms the network layer with what, initially, appears to be legitimate traffic. This type of attack is the most common form of DDoS attack. An example of a volumetric attack is DNS (Domain Name Server) amplification, which uses open DNS servers to flood a target with DNS response traffic.
A protocol attack causes a service disruption by exploiting a weakness in the layer 3 and layer 4 protocol stack. One example of this is a synchronized or SYN attack, which consumes all available server resources.
A resource (or application) layer attack targets web application packets and disrupts the transmission of data between hosts. Examples of this type of attack include HTTP protocol violations, SQL injection, cross-site scripting, and other layer 7 attacks.

Cyber-attackers might use one or multiple types of attacks against a network. For instance, an attack might start off as one class of attack and then morph into or combine with another threat to wreak havoc on a system.

Additionally, there are a variety of cyberattacks within each category. The number of new cyberthreats is on the rise, and expected to climb, as cybercriminals become more sophisticated.

If you suspect your network is under attack, it’s important that you act fast—on top of downtime, a DDoS attack can leave your organization vulnerable to other hackers, malware, or cyberthreats.

How to detect and respond to a DDoS attack

While there’s no one way to detect a DDoS attack, there are a few signs your network is under assault:

You see a surge in web traffic, seemingly out of nowhere, that’s coming from the same IP address or range.

You experience slow or irregular network performance.

Your website, online store, or other service goes completely offline.

Modern software solutions can help determine potential threats. A network security and monitoring service can alert you to system changes so that you can respond quickly.

You also want to have a DDoS-attack action plan—with defined roles and procedures—so your team can take swift and decisive action against these threats. It’s important to remember that not all DDoS attacks are the same; you’ll need different response protocols in place to mitigate different attacks.

How to prevent DDoS attacks

Before a cyberthreat is on your radar, you’ll want to have a process for one in place. Preparedness is key to promptly detecting and remedying an attack.

Here are suggestions for putting together an action plan:

Develop a denial-of-service defense strategy to help detect, prevent, and reduce DDoS attacks.
Identify gaps in security and assess potential threats to your setup.
Update any protection software or technology and ensure it’s working correctly.
Get your team on board and assign roles in the event of an attack.

It’s essential that you boost your efforts with products, processes, and services that help you secure your business. That way, once a threat is detected, your team is knowledgeable and empowered to act on it.

DDoS protection

Guard your network against future attacks. To help secure your business:

Conduct a risk analysis on a regular basis to understand which areas of your organization need threat protection.

Organize a DDoS-attack response team whose focus is to identify and mitigate attacks.

Incorporate detection and prevention tools throughout your online operations, and train users on what to look out for.

Evaluate the effectiveness of your defense strategy—including running practice drills—and determine next steps.

DDoS attack protection comes in many forms—from online resources to monitoring software to threat-detection tools. Learn how to thwart malicious attacks with the help of industry-leading, trusted Microsoft security experts.

Secure your organization online

Cyberthreats like DDoS attacks and malware can harm your website or online service, and negatively affect functionality, customer trust, and sales.

Detect, defend, and secure your organization. With integrated threat protection products and expert resources, you can better protect your business, online operations, and sensitive data.

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