- The Aisuru botnet launched a record 31.4 Tbps DDoS attack on the telecommunications sector
- Cloudflare mitigated the “Night before Christmas” campaign without major disruption
- The botnet uses compromised consumer devices with weak credentials or outdated firmware
In late December 2025, an unnamed company in the telecommunications sector was hit by the largest Distributed Denial of Service (DDoS) attack ever.
Cloudflare recently released its 2025 Q4 DDoS Threat Report, in which it said it successfully mitigated an attack by the Aisuru botnet. For those unfamiliar with Aisuru, it is currently one of the largest botnets in existence, numbering hundreds of thousands of devices and regularly credited with the largest DDoS attacks.
On December 19, Aisuru targeted several companies, mostly in the telecommunications industry, with a distributed Denial of Service attack that at one point peaked at 31.4 Tbps and 200 million requests per second. This made it the largest DDoS attack ever recorded, breaking the previous record also held by Aisuru, which hit 29.7 Tbps.
An unprecedented bombardment
Cloudflare described it as “unprecedented bombardment” of the telecommunications and IT industry, calling the campaign “The Night Before Christmas”:
“The campaign targeted Cloudflare customers as well as Cloudflare’s dashboard and infrastructure with hypervolumetric HTTP DDoS attacks that exceeded speeds of 200 million requests per second (rps) along with Layer 4 DDoS attacks that peaked at 31.4 Terabits per second, making it the largest attack ever published,” Cloudflare explained.
The majority of Aisuru attacks usually last between one and two minutes and peak between 1-5 Tbps. The majority (94%) varied between 1-5 billion packets per second.
Aisuru is currently one of the largest and most dangerous botnets out there, targeting hundreds of thousands of home routers, smart cameras, DVR systems and other consumer equipment. The attackers usually target outdated firmware or weak credentials to gain access to the devices and install malware that allows them to send traffic where and when they want.
Via Bleeping Computer
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