'Largest-ever' cloud DDoS attack pummels Azure with 3.64B packets per second

Azure was hit by the "largest-ever" cloud-based distributed denial of service (DDoS) attack, originating from the Aisuru botnet and measuring 15.72 terabits per second (Tbps), according to Microsoft.

On October 24, the Windows giant's cloud DDoS protection service auto-detected and mitigated the traffic tsunami - nearly 3.64 billion packets per second - so no customer workloads experienced any service interruptions, Microsoft's Sean Whalen said in a Monday blog.

More than 500,000 source IPs from various regions flooded a single endpoint with User Datagram Protocol (UDP) packets during the DDoS event, he added.

"This was the largest DDoS attack ever observed in the cloud and it targeted a single endpoint in Australia," Whalen wrote, noting that the Aisuru botnet was behind the network flood.

Aisuru is a new-ish Mirai-based IoT botnet that has been causing record-breaking DDoS attacks since it emerged in August 2024. This includes one in ...