Microsoft Fends Off Record-Breaking 3.47Tbps DDoS Attack

Microsoft's Azure DDoS Protection team said that in November, it fended off what industry experts say is likely the biggest distributed denial-of-service attack ever: a torrent of junk data with a throughput of 3.47 terabits per second. Ars Technica reports: The record DDoS came from more than 10,000 sources located in at least 10 countries around the world. The DDoS targeted an unidentified Azure customer in Asia and lasted for about two minutes. The following month, Microsoft said, Azure warded off two other monster DDoSes. Weighing in at 3.25Tbps, the first one came in four bursts and lasted about 15 minutes. The second December DDoS reached a peak of 2.54Tbps and lasted about five minutes.

The record beats a 2.5Tbps attack that Microsoft mitigated in the first half of 2021. Previously, one of the biggest attacks was 2.37Tbps in size, a 35 percent increase over a record set in 2018. A separate DDoS in 2020 generated 809 million packets per second, which was also a record at the time. Packet-per-second DDoSes work by exhausting the computing resources of a server. More traditional volumetric attacks, by contrast, consume available bandwidth either inside the targeted network or service or get between the target and the rest of the Internet. The 3.7Tbps attack delivered roughly 340 million packets per second.

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