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<\/figure>\n<\/div>\n\n\nWhat is a DDOS Attack?<\/h2>\n\n\n\n
Distributed Denial of Service (DDoS) attack is an attempt to inhibit the proper functioning of a particular server, service, or network through flooding or overloading the target or its neighbors with an influx of traffic.<\/p>\n\n\n\n
These attacks use one or more compromised computer systems as a source of the unauthorized traffic. It can also refer to computers and other connected assets, including Internet of Things (IoT) devices.<\/p>\n\n\n\n
DDoS attacks are similar to a crowd blocking a road with traffic traffic hindering the normal traffic from getting to the intended destination. Thus, DDoS attacks are still a tremendous danger for businesses and organizations.<\/p>\n\n\n\n
They may cause extensive service outages, significant monetary losses, and erosion of brand images. It is therefore important to comprehend these attacks and what they mean so as to be in a better position to design protective measures.<\/p>\n\n\n\n
DDoS vs. DoS Attacks: Know What the Difference Is!<\/h2>\n\n\n\n
A DDoS attack is a distributed version of a DoS attack, a type of cyberattack in which various compromised systems attack a single system, typically to overwhelm its resources & render it unavailable to its intended users. It can be initiated from anywhere in the world using any compromised device, which includes laptops, workstations, routers, cell phones, and various internet-connected machines.<\/p>\n\n\n\n
It is essential to understand the difference between both two attacks. Since just one word separates the two, the nature of these attacks varies significantly:<\/strong><\/p>\n\n\n\n Since a DoS originates in a single location, it is easy to identify and terminate the connection. A capable firewall can identify this. On the contrary, a DDoS attack originates from several remote locations, concealing its source.<\/p>\n\n\n\n Since a DDoS attack starts from numerous locations, it can be launched much quicker than a DoS attack originating from a single location. The increased attack speed makes detection more difficult, which leads to increased harm or even a disastrous outcome.<\/p>\n\n\n\n A DDoS attack coordinates multiple hosts infected with malware (bots), forming a botnet managed by a command-and-control (C&C) server. A DoS attack, on the other hand, is usually carried out from a single computer using an application\/program.<\/p>\n\n\n\n Since a DDoS attack uses multiple remote machines (zombies or bots), it can transmit much more traffic (than DoS) from different locations simultaneously, overloading a server quickly and avoiding detection.<\/p>\n\n\n\n DDoS attacks are carried out using the network of computers associated with the Internet; these networks are made up of PCs & other systems (such as IoT devices) that have been infected with malicious software, enabling a malicious user to influence or compromise them remotely. <\/p>\n\n\n\n These infected devices are known as zombies (or bots), & a network of bots is known as a botnet. After establishing a botnet, the attacker can direct an attack by transmitting remote commands to each zombie.<\/p>\n\n\n\n When the botnet targets a network ora victim’s server, every single bot (or zombie) transmits requests to the target’s IP address, possibly overloading the server or network and causing an interruption of service to normal traffic, which leads to denial of service to legitimate users. <\/p>\n\n\n\n Since each bot is a legitimate network device, discriminating between attack traffic and regular data can be challenging.<\/p>\n\n\n\n Categorizing DDoS attacks into three as:<\/strong><\/p>\n\n\n\n Examples of attacks flood the target with massive amounts of traffic, making it difficult or impossible to access. The attack’s goal is to saturate the bandwidth of the targeted system, and the attack magnitude is measured in bits per second (Bps). UDP floods, ICMP floods, and DNS escalation assaults are some examples.<\/p>\n\n\n\n This attack uses server resources or intermediary communication devices like firewalls and load balancers, and it can be measured in packets per second. (Pps). Examples include SYN floods, fragmented packet assaults, Ping of Death, Smurf DDoS, and other threats.<\/p>\n\n\n\n This type of attack aims at the application layer instead of the network layer. Attackers exploit web applications’ vulnerabilities and misuse platform resources, causing the system to slow down, crash, or become unavailable. <\/p>\n\n\n\n The magnitude of the is measured in Requests per second. Examples include low-and-slow attacks, GET\/POST floods, and attacks targeting Apache, Windows, or OpenBSD vulnerabilities.<\/p>\n\n\n\n Let’s understand each attack in detail.<\/p>\n\n\n\n By definition, a UDP flood targets a system with User Datagram Protocol (UDP) packets. The attack aims to overwhelm random ports on a remote server. This forces the host to keep looking for an application waiting on that port frequently and (if no application is found) respond with an ICMP ‘Destination Unreachable’ packet. <\/p>\n\n\n\n This action drains server resources, eventually resulting in the unavailability of services to legitimate users.<\/p>\n\n\n\n An ICMP flood attack, like a UDP flood attack, overwhelms the intended resource with ICMP Echo Request (ping) packets, usually transmitting packets as quickly as possible without waiting for responses. <\/p>\n\n\n\n Since the victim’s servers frequently try to react with ICMP Echo Reply messages, this type of attack can occupy both outward and inward bandwidth, which causes a significant overall system delay.<\/p>\n\n\n\n This attack benefits services that respond to network traffic directed at a server. For example, an attacker sends a request to a server, which causes it to reply with a significant amount of data, which is then sent to the victim (server).<\/p>\n\n\n\n SYN-flood DDoS attack is a form of Distributed Denial of Service attack in which a target network or server is overwhelmed with an inflow of SYN packets. <\/p>\n\n\n\n In a SYN-flood attack, the attacker floods the intended server with SYN packets but never completes the 3-way handshake by delivering an ACK message. It causes the server’s connection queue to fill up, rendering it unable to take new connections and, consequently, creating a denial-of-service for genuine users.<\/p>\n\n\n\n These attacks are slow and constant, to go undetected. They transmit fewer requests over time, slowly consuming resources and overloading the system.<\/p>\n\n\n\n Zero-day exploit<\/em>\u00a0<\/a>refers to the method or technique hackers use to exploit a vulnerability, often through malware, and execute the attack. The phrase is well-known among members of the hacker community, where trading zero-day weaknesses is an everyday activity.<\/p>\n\n\n\n With the spread of IoT devices, attackers may penetrate these devices and initiate attacks. Mirai, for example, compromised IoT devices such as routers and CCTV cameras to trigger attacks.<\/p>\n\n\n\n These attacks target mobile apps or networks, sending traffic to the target via botnets or malware-infected mobile devices.<\/p>\n\n\n\n Distributed Denial of Service Attacks are becoming increasingly prevalent & more widespread. The world has seen a nearly 300 percent increase in these attacks yearly. <\/strong>Over the last two decades, some recent DoS attacks have targeted significant brands that provide services to millions of customers. <\/p>\n\n\n\n These attacks are expected to continue to increase in number & complexity as botnets and inexpensive DDoS-as-a-service platforms proliferate.<\/p>\n\n\n\n During the COVID-19 pandemic, cybercriminals have had two busy years, with rapidly increasing numbers of DDoS weapons, widespread botnet activity, and some of the largest DDoS attacks ever recorded.<\/p>\n\n\n\n Let’s look at the most famous DDoS attacks that have happened to date and their impact:<\/strong><\/p>\n\n\n\n Having approved the accession votes from Turkey and Hungary, Sweden gained succession to NATO, which brought many retributions from numerous hacktivist groups.<\/p>\n\n\n\n Even when the Swedish foreign minister intimated in a speech that Hungary had implicitly endorsed its bid to join NATO on February 14, the attacks started immediately, with attack intensity escalating to 636 on February 15.<\/p>\n\n\n\n This led to a sharp rise in hidden hostility and revenge from various politically motivated hacker organizations. Actually, cybercriminals from Russia are influencing the government organizations in Sweden through ransomware attacks.<\/p>\n\n\n\n This is equally shocking or even more shocking than that faced by other NATO member countries like Hungary, France, and Poland, among others.<\/p>\n\n\n\n The mitigation recorded a series of changes in the course of time against Swedish targets which somewhat for the most part escalated at mid 2023 through to 2024, the peak being on the fifteenth of February, 2024, the figure being 315% more than on the same day in 2023.<\/p>\n\n\n\n As reported, the attackers involved in these works included NoName057, Anonymous Sudan, Russian Cyber Army Team, and Killnet. All these groups are politically motivated, supporting Russian ideas for society.<\/p>\n\n\n\n On 25-27 July 2023, Amazon Web Services, Google, and Cloudflare came under record DDoS attacks from classic botnets that were notably tinier than previous ones. This was rather worrying and pointed towards new techniques being employed.<\/p>\n\n\n\n More analyses showed that last year, a network attack that tentatively involved opening a large number of streams leveraging a feature in HTTP\/2 that allows for fast request cancellation using the RST_STREAM frame, which can ultimately result in resource depletion by constantly opening and closing streams.<\/p>\n\n\n\n Surprisingly, this kind of DDoS attack is ideal for cessation by means of ADC reconfigurations.<\/p>\n\n\n\n This is because this DDoS attack doesn\u2019t involve the use of the number of requests or even the packet of \u2018data\u2019 that is being sent as its strength but it is overwhelmed by the number of headers in the packets of \u2018data\u2019 that are being forwarded.<\/p>\n\n\n\n Also Read:<\/strong> Massive DDoS Attacks on Outlook, OneDrive, and other Microsoft 365 Services<\/a><\/p>\n\n\n\n Firewalls that are geared towards DDoS attacks are rarely designed to analyze specifics within the actual packet. Instead of focusing on these fields, they are optimized to monitor other fields that are more likely to contain data of the incoming DDoS attack.<\/p>\n\n\n\n An ADC, however, often tends to look more into the requests for the actual reasons or need, as they are required to create sessions between the clients and servers; thus, they are perhaps least equipped to respond to this type of DDoS attack.<\/p>\n\n\n\n Rapid reset HTTP\/2, proving that DDoS is far from gone, and a new and scary form is evolving.<\/p>\n\n\n\n In February 2023, Cloudflare stated that it provided details of the biggest-ever DDoS attack that was addressed.<\/p>\n\n\n\n This attack reached an unprecedented 71 million requests per second, besting the previous record of 46 million requests per second (RPS) achieved in June 2022 by 54. 3%.<\/p>\n\n\n\n Similarly, it presented a series of attacks that also raised the peak rates of up to 50-70 million RPS, as stated by Cloudflare. The threats are aimed at gaming service providers, Cryptocurrency organizations, hosting companies, and Cloud Solution providers.<\/p>\n\n\n\n Also Read:<\/strong> Cloudflare Blocks Largest DDoS Attack Ever: 7.3 Tbps and 37.4 TB in Just 45 Seconds<\/a><\/p>\n\n\n\n However, it is worth mentioning that this is not the first time that Cloudflare claimed to have defended what it called the \u2018largest\u2019 DDoS attack in history.<\/p>\n\n\n\n However, the company agreed with the findings that these attacks are becoming increasingly in terms of size, sophistication, and frequency.<\/p>\n\n\n\n Minecraft was the preferred name criminals used while attacking cellular devices, taking up 90 percent. Mobile game-related attacks are relatively high at 37% of overall game attacks, and target 80,128 users.<\/p>\n\n\n\n One such example relates to the Indonesia case where the Trojan. AndroidOS. Pootel. It was exercised in a manner that sought to capitalize on the Minecraft gamers.<\/p>\n\n\n\n The malicious app was leading users to a fake marketplace page for Minecraft and then utilizing the Google Phone Number Hint API to gather the necessary phone numbers for friending and subscribing the users to premium services without the users\u2019 consent.<\/p>\n\n\n\n The same was demonstrated by the rising number of cyber threats in the mobile gaming sector and 54,467 cyber alerts in the Islamic Republic of Iran associated with Minecraft. <\/p>\n\n\n\n Also Read:<\/strong> Critical PHP Vulnerabilities Allow SQL Injection & DoS Attacks \u2013 Patch Now<\/a><\/p>\n\n\n\n PUBG: <\/strong>Other titles featuring similar levels of cheating were Battlegrounds and Roblox, which shows that the situation is rather universal across some of the most popular games for mobile devices.<\/p>\n\n\n\n Furthermore, the SpyNote Trojan, which has infiltrated the Android platform to target Roblox players, with capabilities of spying features like keylogging, phone camera controls, and fake Google or Facebook application interfaces.<\/p>\n\n\n\n This adds to the fact that cybercriminals are taking their time to implement serious coded means to manipulate user privacy and data.<\/p>\n\n\n\n On the 28th of January, 2023, its affiliates KillNet performed multiple syndicated DDoS attacks on multiple HPH organizations in the U. S. as well as several NATO countries, seemingly, in response to the supply of tanks to and in support of Ukraine.<\/p>\n\n\n\n Established at least from January 2022, KillNet is infamous for executing DDoS attacks on several primary and essential infrastructure linking to states aiding Ukraine in the war against Russia or those parties perceived as \u2018\u2019anti-Russian. \u2019\u2019<\/p>\n\n\n\n Despite being mainly centered on ransomware, which is not often damaging, their cyber-attack method may disrupt the services of fragile systems for several hours or even days.<\/p>\n\n\n\n Unlike many hacktivist groups that avoid attacking HPH organizations, the group has surreptitiously attacked hospitals as well as medical organizations throughout the sector. <\/p>\n\n\n\n The information reported that more than 90 organized DDoS attacks occurred in late January 2023 on healthcare systems that include several hospitals, a single hospital or a medical center only.<\/p>\n\n\n\n Out of these, 55 percent were healthcare systems with at least one general hospital and general hospitals with Level I general and nonsurgical clinical trauma center, which offers the most extensive and the higher degree of complicated trauma care to patients with critical or severe illnesses or injuries.<\/p>\n\n\n\n Because they are usually huge organizations that handle a vast number of patient records to input as well as analyze, such a HPH organization becomes an ideal candidate for KillNet and its partners.<\/p>\n\n\n\n This is one of the massive DOS attacks reported in February 2020. With a peak traffic rate of 2.3 Tbps (Terabits per second), the AWS attack in February 2020 was one of the largest DDoS attacks ever seen. The three-day attack on Amazon Web Services (AWS) infrastructure caused significant disruptions to different AWS services worldwide.<\/p>\n\n\n\n The hackers carried out this malicious activity by leveraging a weakness in the Internet’s Domain Name System (DNS), enabling them to transmit a massive amount of data to AWS servers. The attack has overburdened the computers, which has led to slower load speeds and interrupted service for many users. <\/p>\n\n\n\n AWS rapidly reacted to the attack by deploying mitigation measures to block malicious traffic and secure its customers. AWS also collaborated with law enforcement to identify and capture the culprits.<\/p>\n\n\n\n GitHub is a centralized collaboration tool that software developers from all over the globe can use. <\/p>\n\n\n\n In 2018, hackers saw a chance to use Memcached, a caching system, to directly transmit 1.3 Tbps of data to the GitHub servers, which shows that they did not use the typical zombie bot army. <\/p>\n\n\n\n The Memcached computers enabled the hackers to multiply their attacks by 50,000. This is one of the biggest DDoS attacks GitHub has experienced so far. <\/p>\n\n\n\n Because GitHub has powerful DDoS protection measures, the attack endured only about 20 minutes.<\/em><\/strong> Within 10 minutes of this malicious event, an alert was triggered, and the protection service stopped the attack before it became uncontrollable.<\/p>\n\n\n\n In 2016, a botnet, “Mirai,” initiated several DDoS attacks. The Mirai network was built by infecting IoT (Internet of Things) devices with malicious software, like webcams, modems, & other smart devices. The network was then used to initiate massive Distributed Denial of Service (DDoS) attacks on DNS providers, online hosting businesses, and other targets, causing extensive damage. The attacks started in September 2016, with the DNS provider Dyn being the first significant target. The Dyn attack prompted widespread internet outages, with services like Twitter, Reddit, and Airbnb falling offline for several hours. Luckily, Dyn was able to solve the attack within a day. However, the intention of the attack was never revealed. <\/p>\n\n\n\n This botnet was also used to initiate attacks against the KrebsOnSecurity.com website. <\/p>\n\n\n\n On September 20, 2016, a DDoS attack with a throughput of more than 620 Gbps was launched against cybersecurity specialist Brian Krebs’ site. Krebs’ website had previously been targeted. Krebs had logged 269 attacks since July 2012, but this strike was nearly three times larger than anything the Internet or his site had seen.<\/p>\n\n\n\n On September 19<\/em><\/strong>, the next Mirai botnet attack targeted OVH, one of Europe’s biggest hosting providers, which serves approximately 18 million applications for over one million customers. <\/p>\n\n\n\n This attack was aimed at a single unnamed OVH client and was carried out by 145,000 bots, resulting in a traffic load of up to 1.1 terabits per second. It ran for approximately seven days. <\/p>\n\n\n\n However, OVH would not be the last Mirai malware casualty in 2016. The Mirai botnet identified a major increase in the potency of an attack. The Mirai network’s magnitude and sophistication were unimaginable, as were the scale and level of the attacks.<\/p>\n\n\n\n The largest DDoS attack in history targeted GitHub and lasted for several days. The politically driven attack adapted to DDoS mitigation techniques that had been implemented. <\/p>\n\n\n\n The activity started in China and mainly targeted two GitHub projects geared at evading Chinese state censorship, with the goal of putting pressure on GitHub to remove those projects.<\/p>\n\n\n\n Attackers generated malicious traffic by inserting JavaScript code into the computers of all visitors to Baidu, China’s most famous search engine, and infecting other websites that used Baidu’s analytics services with malicious code. Affected browsers transmitted HTTP queries to the targeted GitHub pages.<\/p>\n\n\n\n Spamhaus is a worldwide non-profit organization that monitors spam and other cyber threats. The attack overwhelmed Spamhaus’ servers, disrupting its services and slowing internet access for millions of users around the globe. <\/p>\n\n\n\n CyberBunker, an online hosting firm that Spamhaus had banned for hosting spam domains, launched the attack. CyberBunker reportedly used a botnet, hacked PCs, and IoT devices to initiate the vast DDoS attack on Spamhaus.<\/p>\n\n\n\n The attack escalated at 300 Gbps, making it one of the most powerful DDoS attacks ever documented. In response to the attack, law enforcement agencies in several nations started investigations and arrested some suspects. The attack also focused on the need for improved DDoS security and the significance of cooperation among internet stakeholders to mitigate such threats.<\/p>\n\n\n\n A 15-year-old hacker known as ‘Mafiaboy’ took down several reputed websites in 2000, including CNN, Dell, E-Trade, Yahoo!, and eBay, the most renowned search engines in the world. The attack had devastating effects, including stock market chaos.<\/p>\n\n\n\n Michael Calce, a high school student, coordinated the attacks by hacking into the networks of several colleges and using their servers to launch the attack. The fallout of this attack directly influenced many of today’s cybercrime regulations.<\/p>\n\n\n\n Checklist to understand whether a website is fake or real.<\/a><\/p>\n\n\n\n The attackers often target high-profile websites, such as those belonging to government agencies, financial institutions, e-commerce websites, and social media platforms. Attackers may target any organization with a significant online presence or rely on its website for revenue or operations. <\/p>\n\n\n\n Attackers may also target specific industries like healthcare or online gaming to disrupt services or extort money. As such, having an incident response strategy that allows for malicious activities against an organization is essential. The planning part of an incident response plan includes all activities and measures enacted to avoid and prepare for an attack response.<\/p>\n\n\n\n To minimize the danger and effect of these cruel attacks, you should implement the following defensive steps:<\/strong><\/p>\n\n\n\n Data Filtering is detecting and filtering malicious data before it enters the network. Firewalls, intrusion monitoring systems, and other security tools can help.<\/p>\n\n\n\n Load Balancing helps to spread inbound traffic across numerous computers or networks, lessening the effect of an attack on a single system.<\/p>\n\n\n\n Network segmentation divides a network into smaller segments that are simpler to manage and secure. It can help limit the attack’s effect by isolating the attacker to a single network section.<\/p>\n\n\n\n Scrubbing entails sending incoming data to a third-party service provider, where it is filtered to eliminate malicious traffic. The system returns filtered traffic to its initial location.<\/p>\n\n\n\n Blackhole Routing involves redirecting all traffic to a null path, essentially deleting all traffic to the targeted system. It can be an efficient method to mitigate the attack, but it can have unintended effects if not done correctly.<\/p>\n\n\n\n Cloud-based DDoS security services<\/a> may assist in mitigating attacks by absorbing large amounts of traffic and filtering out malicious traffic before it hits the targeted system.<\/p>\n\n\n\n\n
Nature of DDoS Attack Detection<\/h2>\n\n\n\n
The Difficulty of Detection: <\/h3>\n\n\n\n
Attack Speed: <\/h3>\n\n\n\n
Method of Execution: <\/h3>\n\n\n\n
Traffic volume: <\/h3>\n\n\n\n
How Does a DDoS Attack Work?<\/h2>\n\n\n\n
What are the Common Types of DDoS Attacks?<\/h2>\n\n\n\n
\n
Volume-Based Attacks<\/h3>\n\n\n\n
Protocol Attacks<\/h3>\n\n\n\n
Application Layer attacks<\/h3>\n\n\n\n
Common Types of DDoS Attacks:<\/h3>\n\n\n\n
\n
UDP Flooding<\/h3>\n\n\n\n
ICMP (Ping) Flood<\/h3>\n\n\n\n
DRDoS (Distributed Reflection Denial of Service)<\/strong><\/h3>\n\n\n\n
SYN-Flood Attack<\/h3>\n\n\n\n
Low and Slow Attacks<\/h3>\n\n\n\n
Zero-day Attacks<\/h3>\n\n\n\n
Internet of Things (IoT) DDoS Attacks<\/h3>\n\n\n\n
Mobile DDoS Attacks<\/h3>\n\n\n\n
Examples of the Largest DDoS Attacks Reported<\/h2>\n\n\n\n
\n
Sweden DDoS Attacks (2024)<\/h3>\n\n\n\n
Novel DDoS Attack (2023)<\/h3>\n\n\n\n
Cloudflare DDoS Attack (2023)<\/h3>\n\n\n\n
Minecraft DDoS Attack (2023)<\/h3>\n\n\n\n
KillNet Healthcare Campaign (2023)<\/h3>\n\n\n\n
The AWS Attack (Feb 2020)<\/h3>\n\n\n\n
The GitHub Attack (Feb 2018)<\/h3>\n\n\n\n
The Mirai Botnet Dyn Attack (Sep 2016):<\/h3>\n\n\n\n
The Mirai Krebs & OVH DDoS Attacks (Sep 2016):<\/h3>\n\n\n\n
The GitHub Attack (Mar 2015)<\/h3>\n\n\n\n
The Spamhaus Attack (Mar 2013)<\/h3>\n\n\n\n
The Mafiaboy Attack (Feb 2000)<\/h3>\n\n\n\n
What are the DDoS Mitigation Techniques?<\/h2>\n\n\n\n
Data Filtering: <\/h3>\n\n\n\n
Load Balancing: <\/h3>\n\n\n\n
Network Segmentation: <\/h3>\n\n\n\n
Scrubbing:\u00a0<\/h3>\n\n\n\n
Blackhole Routing: <\/h3>\n\n\n\n
Cloud-based DDoS Security Services: <\/h3>\n\n\n\n