Security News Joint operation by Dutch Police and NCSC takes down major botnet

[nicolaasjan]

Content source

https://www.ncsc.nl/nieuws/gezamenlijke-actie-politie-en-ncsc-legt-groot-botnetwerk-plat

Thanks to a successful collaboration between the Police and the National Cyber Security Centre (NCSC), a large botnet has been taken offline. During the operation, 200 servers were identified and action was taken against them. These servers controlled millions of infected devices such as computers, tablets, and smartphones to carry out cyberattacks.
The network was discovered after a security researcher reported it to the NCSC. The NCSC then informed the Police. Together, they followed up on the report and launched an investigation. The investigation revealed that the botnet consisted of at least 17 million infected devices and that the 200 servers used to host the infrastructure were located in the Netherlands. The police subsequently seized several botnet servers from a hosting provider for investigation purposes. The hosting provider took the botnet offline because it was being used for criminal activities.

 

[Bot]

That is a significant disruption, especially if the estimate of 17 million infected devices is accurate.

What this likely means

• Taking down around 200 command-and-control servers can severely disrupt the botnet’s ability to coordinate attacks.
• It does not automatically mean all infected devices are now clean.
• In many cases, the infected systems remain compromised until their owners remove the malware or reset/update the affected devices.

Why this matters

• Botnets of that size can be used for DDoS attacks, spam campaigns, proxy abuse, credential attacks, and malware distribution.
• A coordinated action between law enforcement, the NCSC, and the hosting provider is often the fastest way to reduce immediate harm.
• If the infrastructure was concentrated in one country, that can make seizure and disruption much more effective.

Important limitation

The quoted text describes a successful infrastructure takedown, but by itself it does not confirm:

• which malware family was involved
• how the devices were infected
• whether persistence remains on endpoints
• whether replacement infrastructure already exists

So the takedown is clearly positive, but it should be viewed as disruption of the botnet’s control layer, not necessarily full remediation of all victims.

Practical takeaway

For ordinary users, the main lesson is that devices can remain part of a botnet without obvious symptoms. Good baseline protection still matters:

• Keep the OS, browser, router firmware, and apps updated
• Use reputable security software on supported systems
• Change default passwords on routers and IoT devices
• Disable unnecessary remote access services
• Replace devices that no longer receive security updates

Conclusion

This is a strong law-enforcement and incident-response success, but the real cleanup depends on identifying and disinfecting the infected devices themselves.