Microsoft said on November 17, 2025 that its Azure DDOS Protection successfully mitigated the largest cloud DDOS attack ever recorded, at 15.72 Tbps (Tera bits per second) and 3.64 billion pps (packets per second). The attack involved extremely high-rate UDP floods targeting a specific public IP address, launched from over 500,000 source IPs across various regions. The sudden UDP bursts had minimal source spoofing and used random source ports.
The attack originated from Aisuru botnet. Aisuru is a Turbo Mirai-class IoT botnet that frequently causes record-breaking DDoS attacks by exploiting compromised home routers and cameras/DVRs, mainly in residential ISPs in the United States and other countries.
Read more about it here.