Microsoft Mitigates Record 15.72 Tbps DDoS Attack Driven by AISURU Botnet
Nov 18, 2025
IoT Security / Botnet
Microsoft on Monday disclosed that it automatically detected and neutralized a distributed denial-of-service (DDoS) attack targeting a single endpoint in Australia that measured 15.72 terabits per second (Tbps) and nearly 3.64 billion packets per second (pps). The tech giant said it was the largest DDoS attack ever observed in the cloud, and that it originated from a TurboMirai-class Internet of Things (IoT) botnet known as AISURU . It's currently not known who was targeted by the attack. "The attack involved extremely high-rate UDP floods targeting a specific public IP address, launched from over 500,000 source IPs across various regions," Microsoft's Sean Whalen said . "These sudden UDP bursts had minimal source spoofing and used random source ports, which helped simplify traceback and facilitated provider enforcement." According to data from QiAnXin XLab, the AISURU botnet is powered by nearly 300,000 infected devices, most of which are routers, se...
