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Q2’23 Experienced a 532% Surge in DDoS Attacks exploiting the Mitel Vulnerability: Cloudflare Report


One of the largest attacks this quarter was an ACK flood DDoS attack which originated from a Mirai-variant botnet comprising approximately 11K IP addresses. 

 “Even the largest and most sophisticated attacks that we’ve seen may only last a few minutes or even seconds — which doesn’t give a human sufficient time to respond.”

Bashar Bashaireh, Managing Director & Head of Sales – Middle East and Türkiye, Cloudflare

Cloudflare’s 2023 Q2 DDoS report reveals tailored and persistent waves of DDoS attack campaigns on various fronts, including: 

  1. Multiple DDoS offensives orchestrated by pro-Russian hacktivist groups REvil, Killnet and Anonymous Sudan against Western interest websites. 
  1. An increase in deliberately engineered and targeted DNS attacks alongside a 532% surge in DDoS attacks exploiting the Mitel vulnerability (CVE-2022-26143). Cloudflare contributed to disclosing this zero-day vulnerability last year. 
  2. Attacks targeting Cryptocurrency companies increased by 600%, as a broader 15% increase in HTTP DDoS attacks was observed. Of these, there is an alarming escalation in attack sophistication. 

Additionally, one of the largest attacks this quarter was an ACK flood DDoS attack which originated from a Mirai-variant botnet comprising approximately 11K IP addresses. The attack targeted an American Internet Service Provider. It peaked at 1.4 terabit per seconds (Tbps) and was automatically detected and mitigated by Cloudflare’s systems. 

Despite general figures indicating an increase in overall attack durations, most of the attacks are short-lived and so was this one. This attack lasted only two minutes. However, more broadly, Cloudflare has seen that attacks exceeding 3 hours have increased by 103% QoQ. 

Sophisticated HTTP DDoS attacks 

An HTTP DDoS attack is a DDoS attack over the Hypertext Transfer Protocol (HTTP). It targets HTTP Internet properties such as websites and API gateways. Over the past quarter, HTTP DDoS attacks increased by 15% quarter-over-quarter (QoQ) despite a 35% decrease year-over-year (YoY). Additionally, there has been an alarming uptick in highly-randomized and sophisticated HTTP DDoS attacks over the past few months. 

Protecting websites against sophisticated HTTP DDoS attacks requires intelligent protection that is automated and fast, that leverages threat intelligence, traffic profiling and Machine Learning/statistical analysis to differentiate between attack traffic and user traffic. Moreover, even increasing caching where applicable can help reduce the risk of attack traffic impacting your origin. Read more about DDoS protection best practices here

DNS Laundering DDoS attacks 

The Domain Name System, or DNS, serves as the phone book of the Internet. By disrupting DNS servers, attackers impact the machines’ ability to connect to a website, and by doing so making websites unavailable to users. 

Over the past quarter, the most common attack vector was DNS-based DDoS attacks — 32% of all DDoS attacks were over the DNS protocol. Amongst these, one of the more concerning attack types we’ve seen increasing is the DNS Laundering attack which can pose severe challenges to organizations that operate their own authoritative DNS servers

The term “Laundering” in the DNS Laundering attack name refers to the analogy of money laundering, the devious process of making illegally-gained proceeds, often referred to as “dirty money,” appear legal. Similarly, in the DDoS world, a DNS Laundering attack is the process of making bad, malicious traffic appear as good, legitimate traffic by laundering it via reputable recursive DNS resolvers. A large Asian financial institution and a North American DNS provider are amongst recent victims of such attacks. 

Similar to the protection strategies outlined for HTTP applications, protecting DNS servers also requires a precise, fast, and automated approach. Leveraging a managed DNS service or a DNS reverse proxy such as Cloudflare’s can help absorb and mitigate the attack traffic. For those more sophisticated DNS attacks, a more intelligent solution is required that leverages statistical analysis of historical data to be able to differentiate between legitimate queries and attack queries. 

The rise of the Virtual Machine Botnets 

The era of VM-based DDoS botnets has arrived and with it hyper-volumetric DDoS attacks. These botnets are comprised of Virtual Machines (VMs, or Virtual Private Servers, VPS) rather than Internet of Things (IoT) devices which makes them so much more powerful, up to 5,000 times stronger. These botnets have executed one largest recorded DDoS attacks including the 71 million request per second DDoS attack. Multiple organizations including an industry-leading gaming platform provider have already been targeted by this new generation of botnets. 

Cloudflare has proactively collaborated with prominent cloud computing providers to combat these new botnets. Through the quick and dedicated actions of these providers, significant components of these botnets have been neutralized. Since this intervention, Cloudflare has not observed any further hyper-volumetric attacks yet, a testament to the efficacy of the company’s collaboration. 

“Startblast”: Exploiting Mitel vulnerabilities for DDoS attacks 

In March 2022, we disclosed a zero-day vulnerability (CVE-2022-26143), named TP240PhoneHome, which was identified in the Mitel MiCollab business phone system, exposing the system to UDP amplification DDoS attacks. 

Overall, in the past quarter, Cloudflare has seen additional emerging threats such as DDoS attacks abusing the TeamSpeak3 protocol. This attack vector increased by a staggering 403% this quarter. TeamSpeak, a proprietary voice-over-Internet Protocol (VoIP) that runs over UDP to help gamers talk with other gamers in real time. DDoS attacks that target TeamSpeak servers may be launched by rival groups in an attempt to disrupt their communication path during real-time multiplayer games and thus impact their team’s performance. 

DDoS hotspots: The origins of attacks 

Overall, HTTP DDoS attacks increased by 15% QoQ despite a 35% decrease YoY. Additionally, network-layer DDoS attacks decreased this quarter by approximately 14%. In terms of total volume of attack traffic, the US was the largest source of HTTP DDoS attacks. Three out of every thousand requests we saw were part of HTTP DDoS attacks originating from the US. China came in second place and Germany in third place. 

Industries under attack: examining DDoS attack targets 

When examining HTTP DDoS attack activity in Q2, Cryptocurrency websites were targeted with the largest amount of HTTP DDoS attack traffic. Six out of every ten thousand HTTP requests towards Cryptocurrency websites behind Cloudflare were part of these attacks. This represents a 600% increase compared to the previous quarter. After Crypto, Gaming and Gambling websites came in second place as their attack share increased by 19% QoQ. Marketing and Advertising websites not far behind in third place with little change in their share of attacks. 

The Media & Newspaper industries were the most attacked in the Middle East. The vast majority of attack traffic originated from Europe (74%). 

Countries and regions under attack: examining DDoS attack targets 

When examining the total volume of attack traffic, last quarter, Israel leaped to the front as the most attacked country. This quarter, attacks targeting Israeli websites decreased by 33% bringing it to the fourth place. The US takes the lead again as the most attacked country, followed by Canada and Singapore. If we normalize the data per country and region and divide the attack traffic by the total traffic, we get a different picture. Palestine jumps to the first place as the most attacked country. Almost 12% of all traffic to Palestinian websites were HTTP DDoS attacks. 

Ransom DDoS attacks 

Occasionally, DDoS attacks are carried out to extort ransom payments. Unlike Ransomware attacks, where victims typically fall prey to downloading a malicious file or clicking on a compromised email link which locks, deletes or leaks their files until a ransom is paid, Ransom DDoS attacks can be much simpler for threat actors to execute. Ransom DDoS attacks bypass the need for deceptive tactics such as luring victims into opening dubious emails or clicking on fraudulent links, and they don’t necessitate a breach into the network or access to corporate resources.  

Over the past quarter, reports of Ransom DDoS attacks decreased. One out of ten respondents reported being threatened or subject to Ransom DDoS attacks. 

Commenting on the report, Bashar Bashaireh, Managing Director & Head of Sales – Middle East and Türkiye at Cloudflare, “In recent months, there’s been an alarming escalation in the sophistication of DDoS attacks. And even the largest and most sophisticated attacks that we’ve seen may only last a few minutes or even seconds — which doesn’t give a human sufficient time to respond.”  

“Security is not one single product or a click of a button, but rather a process involving multiple layers of defense to reduce the risk of impact. Cloudflare’s automated DDoS defense systems consistently safeguard our clients from DDoS attacks, freeing them up to focus on their core business operations. These systems are complemented by the vast breadth of Cloudflare capabilities such as firewall, bot detection, API protection and even caching which can all contribute to reducing the risk of impact. The DDoS threat landscape is evolving and increasingly complex, demanding more than just quick fixes. Thankfully, with Cloudflare’s multi-layered defenses and automatic DDoS protections, our clients are equipped to navigate these challenges confidently. Our mission is to help build a better Internet, and so we continue to stand guard, ensuring a safer and more reliable digital realm for all.” 

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