The United States has successfully taken down four major botnets, including Aisuru and Kimwolf, which were behind some of the largest distributed denial-of-service (DDoS) attacks ever recorded. These botnets controlled more than 3 million hacked devices, with Aisuru alone infecting over a million devices across various internet-of-things gadgets like DVRs and smart TVs.

According to DDoS defense firm Cloudflare, in November, the combined attack from Aisuru and Kimwolf reached an unprecedented 31.4 terabits per second—the largest such cyberattack ever seen. This volume of traffic was comparable to the simultaneous typing of a website address by the combined populations of the UK, Germany, and Spain.

The botnets were variants of Mirai, which first appeared in 2016 and became notorious for its ability to disrupt critical infrastructure. While these botnets have been dismantled, cybersecurity experts predict that new generations will emerge, as evidenced by innovative techniques used by the operators to avoid detection, such as using Ethereum blockchain for command-and-control servers.

The operation was a collaboration between US law enforcement and international authorities, targeting not just the DDoS attacks but also the individuals who operated these botnets. The Justice Department stated: 'The United States is committed to safeguarding critical internet infrastructure.'

Despite the takedown, principal security researcher Chad Seaman warns that the fight against such cyberattacks is ongoing. 'You catch one mouse, and 10 others scurry under the refrigerator,' he said, emphasizing that while these botnets have been dismantled, new ones will surely emerge.