Mirai is best known for turning internet-connected devices into bots that attackers can control remotely. The malware became famous for building huge IoT botnets and using them for attacks such as distributed denial-of-service attacks. Click fraud enters the picture when that same kind of infected device is used to generate fake advertising activity.

Where Mirai Fits Into Click Fraud

Mirai itself was mainly designed around IoT botnet activity, particularly DDoS attacks. But the bigger idea behind Mirai is what matters here. Once attackers control thousands of devices, those devices become a pool of computing power that can be directed toward different jobs.

And that pool doesn’t have to stay focused on one type of abuse. An attacker could use compromised devices to create traffic that looks like normal users visiting websites or interacting with ads. If the activity is designed to produce advertising clicks, the result becomes click fraud.

The Botnet Advantage

A botnet makes fake traffic much harder to deal with than one computer repeatedly clicking an ad. The requests come from many infected devices, each sitting on a different network, which can make the activity look more like scattered human traffic.

• Thousands of infected devices, each quietly making requests from its own connection.

• Fake clicks can be spread out over time, which makes the traffic less obvious than a single machine hammering one ad.

• The device owner usually has no idea anything is happening in the background.

That’s the part people often miss. The victim isn’t necessarily trying to commit fraud. Their smart device is simply being used as someone else’s tool.

Why IoT Devices Are Useful

Many IoT devices stay connected for long periods. A camera might sit online all day. A router doesn’t exactly get switched off every evening. And people often pay less attention to what these devices are doing than they do with a laptop or phone.

Mirai took advantage of that environment by scanning for vulnerable devices and adding them to its botnet. Weak credentials were a major part of its original spread. Once compromised, a device could receive commands from the attacker.

Is Mirai Actually a Click Fraud Malware?

Not exactly. Calling Mirai a dedicated click-fraud tool would be misleading. Its original purpose was much more closely tied to building IoT botnets and launching DDoS attacks.

But Mirai demonstrated the infrastructure that makes this kind of abuse possible. Once attackers have control over a large collection of connected devices, they can potentially redirect that control toward other criminal activities, including fraudulent traffic generation.

And that’s why the connection matters. The real asset isn’t the click itself. It’s the compromised device network behind it.

Why Click Fraud Gets Expensive

Online advertising depends heavily on traffic that represents real people. Fraudulent clicks distort that system. An advertiser can end up paying for visits that have no genuine customer behind them, while publishers or fraud operators can benefit from the artificial activity.

Detection systems look for unusual patterns, but large botnets complicate the job because the traffic is distributed across many machines. Security teams therefore have to look beyond individual clicks and examine the behavior surrounding them.

Mirai’s legacy is bigger than one malware family. It showed how ordinary connected devices could be pulled into a massive criminal network. Once you see that, the link to click fraud becomes pretty clear. Your smart device doesn’t need to display an ad to become part of the fraud. It only needs to be under someone else’s control.