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Home > Cybersecurity > 3.47 Tbps DDoS attack on Azure customers is mitigated

3.47 Tbps DDoS attack on Azure customers is mitigated

Microsoft has revealed some of the DDoS attacks aimed at Azure customers in 2021; some of which are record-breaking.

Rusen Gobel by Rusen Gobel
January 28, 2022
in Cybersecurity
2 min read
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3.47 Tbps DDoS attack on Azure customers is mitigated
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DDoS is one of the most used attacking methods that consists of several devices sending requests to a target IP. While it is a primitive attack method, it is still effective on targets without protections. Hopefully, most of the service and cloud providers handle these issues.

Three big DDoS attacks at the end of 2021

Microsoft has revealed its success in DDoS protection for the attacks aimed at Azure customers in 2021. According to the company, there have been three huge attacks that are larger than 2.4 Tbps (terabits per second). In November, a single attack reached 3.47 Tbps with a packet rate of 340 million per second. The 15-minute attack is the largest ever known.

Inbound UDP attack bandwidth mitigated (Tbps)
Inbound UDP attack bandwidth mitigated (Tbps)

Alethea Toh, product manager of Azure Networking at Microsoft stated that the attack has consisted of 10,000 sources from multiple countries such as the United States, China, South Korea, Russia, Thailand, India, Vietnam, Iran, Indonesia, and Taiwan.

Two more attacks are blocked by Microsoft in December, that are also huge; surpassing 2.5 Tbps each. Two of them were aiming the Azure customers originated in Asia. The attacks have reached 3.25 Tbps and 2.55 Tbps, using the UDP vector.

In its report, Microsoft also added that long attacks became more popular, while shorter than 30-minute attacks declined from 74% to 57% in the second half of 2021. Threat actors are now preferring big attacks that consist of a short burst of attacks.

Most of the attacks were using the UDP spoof flood technique, by 55%. TCP ACK flood technique comes in second with 14% and the rest follows as DNS amplification, IP protocol flood, and NTP amplification.

Looking at the target industries, gaming seems to be the hardest hit sector where every millisecond of delay means dissatisfaction for its customers. The attacks on the financial institutions, media, ISPs, retail, and supply chains also increased in 2021.

Most of the attacks were aimed at the United States-based Azure customers, as usual. But this year, Indian customers had a huge spike for being the target; up from 2 percent in the first half of 2021 to 23 percent in the second half of 2021. Attacks on European customers dropped from 19 percent to 6 percent.

See more Cyber Security News


Tags: Microsoft Azure
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Rusen Gobel

Rusen Gobel

Rusen Gobel is a news editor at Cloud7 News. With more than 10 years of experience, Rusen worked as a hardware and software news editor for technology sites such as Shiftdelete, Teknokolis, Hardware Plus, BT Haber. In addition, Rusen publishes consumer product reviews on his YouTube channel. While consumer electronics has been his main focus for years, now Rusen is more interested in WordPress and software development. He had contributed different web application projects in his professional career. Rusen had graduated from Istanbul University, department of Computer Engineering. Rusen has a very high passion for learning and writing for every kind of technology. That's why he has been working as a tech editor for more than ten years on several different technology magazines and online news portals.

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