Azure weathers record 15.7 Tbps cloud DDoS attack

Microsoft says Azure was struck by the largest cloud-based DDoS attack ever, a 15.72 Tbps, 3.64 billion pps assault from the Aisuru botnet, which Azure successfully mitigated.
azure, microsoft, ddos, cloud ddos, aisuru botnet, iot botnet, packets per second, terabits per second, azure ddos protection, cyber threat

According to Microsoft, Azure was hit on 24 October 2025 by a massive multi-vector DDoS attack that peaked at 15.72 terabits per second and unleashed 3.64 billion packets per second on a single endpoint.

The attack was traced to the Aisuru botnet, a Mirai-derived IoT botnet. More than 500,000 unique IP addresses, mostly residential devices, participated in the assault. UDP floods with random ports made the attack particularly potent and harder to spoof.

Azure’s automated DDoS Protection infrastructure handled the traffic surge, filtering out malicious packets in real time and keeping customer workloads online.

From a security-policy viewpoint, this incident underscores how IoT devices continue to fuel some of the biggest cyber threats, and how major cloud platforms must scale defences rapidly to cope.

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