A botnet (short for “robot network”) is a collection of internet-connected computers or devices that have been infected with malicious software and are remotely controlled by a single attacker, often referred to as a bot-herder. Each compromised device within this network is known as a bot. Once infected, these devices become part of a larger system that can be controlled collectively without the knowledge or consent of their owners.
Botnets are commonly used to carry out a range of harmful and illegal activities. These include sending large volumes of spam emails, distributing additional malware, stealing data, or launching coordinated cyberattacks such as Distributed Denial-of-Service (DDoS) attacks, which overwhelm websites or online services and cause them to crash. Because a botnet can consist of thousands or even millions of devices, it provides attackers with significant computing power, making these attacks more effective and difficult to stop.
How do Botnets Work?
Botnets operate by infecting as many devices as possible rather than targeting specific individuals or organisations. The malware used to create a botnet is typically spread through methods such as email attachments, file sharing platforms, malicious downloads, or links shared via social media. In some cases, already infected devices may be used to spread the malware further. When a user unknowingly opens or installs malicious content, their device becomes infected with code that allows it to communicate with the bot-herder.
To avoid detection, botnet malware usually runs quietly in the background and uses only a small portion of the device’s resources. This makes it difficult for users to notice any unusual activity. Once a device is part of the botnet, the bot-herder can send commands remotely, instructing it to perform specific tasks as part of the larger network. This coordinated control is what makes botnets especially dangerous in modern cybersecurity.
Featured image credit Cliff Hang from Pixabay
