Massive growth of DDoS attacks
09 December 2025In the third quarter of 2025, Cloudflare again saw a sharp increase in the number of DDoS attacks. Especially the smart botnet Aisuru is causing problems worldwide. With an estimated 1 to 4 million infected devices and attacks peaking at 29.7 Tbps, it is clear that cybercriminals are scaling up significantly. We are happy to explain what the above message really means and what this has to do with your organization.
DDoS attacks
The latest figures on DDoS attacks are shocking. A DDoS attack (Distributed Denial of Service) is an attack in which a large amount of traffic is sent simultaneously to a server or website, with the aim of making it unreachable, usually to break into a system and steal information.
Infected devices
It is estimated that 1 to 4 million devices are infected, meaning that between 1 and 4 million devices (computers, routers, IoT devices) are compromised with malicious software (malware) and are likely part of a botnet.
Botnet
A botnet consists of devices that are unknowingly infected with malware and then remotely controlled by cybercriminals. The devices usually continue to function “normally.” Owners of the devices often notice nothing, while their devices are used to carry out cyberattacks or other malicious actions.
Tbps
Tbps stands for Terabits per second. A unit of measurement used to indicate high data transfer speeds. 1 terabit represents 1 trillion bits, and per second indicates the speed at which data is transmitted. When we talk about attacks peaking at 29.7 Tbps, it refers to enormous amounts of data traffic being sent to the target to take it down. For comparison: a normal home internet connection is often only a few hundred megabytes per second.
What is Cloudflare?
Cloudflare is a content delivery network (CDN) and a security platform used worldwide by millions of websites. Cloudflare offers services such as DDoS protection.
What is Aisuru?
Aisuru is a Turbo Mirai botnet built from hacked devices.
What is Mirai?
Mirai is malware that targets IoT devices such as IP cameras, routers, and other smart devices, turning them into “zombies.” Together they form a botnet, which is then used to carry out large-scale DDoS attacks.
Conclusion
For you as an entrepreneur or IT manager, it is important to stay informed and invest in good DDoS protection. The threat is only getting bigger and smarter! Have you realized what happens if your website becomes unreachable? Or if employees can no longer log in? And how do you help customers if the CRM system goes down?
Curious how Infracom ICT can help make your company resilient? Feel free to contact us for a free risk analysis and personal advice from our specialists.