Botnet
A network of infected devices ("bots") remotely controlled by attackers – typically for DDoS, spam, or crypto-mining.
A botnet is a network of infected devices ("bots" or "zombies") remotely controlled by attackers via a command-and-control server. Common uses: DDoS attacks, spam delivery, crypto-mining, click fraud.
Infected devices are usually not obviously impacted – antivirus with behavioural analysis spots the unusual network connections.
Why this matters in 2026
The Mirai botnet and its successors (TheMoon, Mozi) primarily exploit poorly secured IoT devices in 2026: routers with default passwords, IP cameras, smart plugs. An infected Swiss home-network device can quietly participate in a global DDoS attack – with no visible damage to the owner.
How to protect yourself
When setting up IoT devices: change the default password immediately, update the firmware, check the vendor's update policy. Router: regular firmware updates, WPA3 instead of WPA2, a separate guest Wi-Fi for smart-home gear. Signs of botnet activity: unusually high traffic at night, sluggish internet despite fibre.