Microsoft has confirmed that Microsoft Azure successfully stopped the largest cloud-based DDoS attack ever recorded. The attack occurred on October 24, 2025.
Azure systems detected a multi-vector assault that peaked at 15.72 Tbps and almost 3.64 billion packets per second. The attack targeted a single public endpoint in Australia, but Microsoft Azure’s global filtering network kept services online without disruption.
According to Microsoft, the attack was launched by the Aisuru botnet, a Turbo Mirai-class network composed of compromised home routers and internet-connected cameras. The botnet generated massive UDP floods from over 500,000 IP addresses. It used random source ports and minimal spoofing, which helped Microsoft trace the source effectively.
Security researchers highlighted that the attack demonstrates how quickly DDoS threats are growing. The increasing availability of high-speed home fiber internet and more powerful IoT devices gives attackers more bandwidth and stronger tools. This trend has resulted in larger and more complex DDoS attacks each year.
Microsoft warned that the upcoming holiday season may see more frequent DDoS attacks. The company urged organizations to review their defenses and ensure all internet-facing systems are protected against large-scale attacks.
The incident underscores the importance of cloud-based security. Microsoft Azure’s advanced filtering system successfully mitigated the attack and maintained uninterrupted service. The company’s cloud infrastructure demonstrated resilience against one of the most powerful cyberattacks in history.
Experts say organizations should take proactive steps to protect critical systems. Microsoft recommends implementing DDoS protection, monitoring traffic patterns, and preparing response plans for potential attacks.
In other related news also read Critical Alert: Microsoft WSUS Flaw Actively Targeted by Hackers
This record-breaking event highlights both the growing threat of DDoS attacks and the critical role of cloud services like Microsoft Azure in safeguarding digital infrastructure worldwide.
