Microsoft repels the largest DDoS attack in history with a capacity of 15.7 Tb/s

Microsoft says that on October 24, 2025, a 15.7 Tbps DDoS attack was launched on the Azure cloud platform. It was launched by the Aisuru botnet using 500,000 IP addresses, Security Affairs reports.

Azure DDoS Protection detected and mitigated a massive multi-vector attack with a peak throughput of 15.72 Tbps and 3.64 billion indexes per second, making it the largest cloud-based DDoS attack in history targeting a single Australian node.

"Attackers are scaling with the internet itself. As fiber-to-the-home speeds rise and IoT devices get more powerful, the baseline for attack size keeps climbing," Microsoft said in a statement. "As we approach the upcoming holiday season, it is essential to confirm that all internet-facing applications and workloads are adequately protected against DDOS attacks."

The attack was carried out by Aisuru, a Turbo Mirai-class IoT botnet that uses compromised home routers and cameras. It avoids government and military targets. However, ISPs have been hit hard by attacks with speeds of over 1.5 Tbps originating from infected user devices.

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