Aisuru Botnet Launches 15.72 Tbps DDoS Attack on Microsoft Azure Network

Microsoft has reported that its Azure platform recently experienced one of the largest distributed denial-of-service attacks recorded to date, attributed to the fast-growing Aisuru botnet. According to the company, the attack reached a staggering peak of 15.72 terabits per second and originated from more than 500,000 distinct IP addresses across multiple regions. The traffic surge consisted primarily of high-volume UDP floods and was directed toward a single public-facing Azure IP address located in Australia. At its height, the attack generated nearly 3.64 billion packets per second. 

Microsoft said the activity was linked to Aisuru, a botnet categorized in the same threat class as the well-known Turbo Mirai malware family. Like Mirai, Aisuru spreads by compromising vulnerable Internet of Things (IoT) hardware, including home routers and cameras, particularly those operating on residential internet service providers in the United States and additional countries. Azure Security senior product marketing manager Sean Whalen noted that the attack displayed limited source spoofing and used randomized ports, which ultimately made network tracing and provider-level mitigation more manageable. 

The same botnet has been connected to other record-setting cyber incidents in recent months. Cloudflare previously associated Aisuru with an attack that measured 22.2 Tbps and generated over 10.6 billion packets per second in September 2025, one of the highest traffic bursts observed in a short-duration DDoS event

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