Key Takeaways
- Dutch police and the National Cyber Security Center (NCSC) dismantled a massive botnet comprising at least 17 million infected devices, including computers, tablets, smartphones, and IoT gadgets.
- More than 200 servers hosted in the Netherlands served as the botnet’s backend infrastructure; a subset was seized from a hosting provider, which then took the service offline.
- The takedown is linked to Asocks, a residential‑proxy provider whose service was allegedly used to route malicious traffic via compromised devices.
- In April 2024, HUMAN’s Satori Threat Intelligence team identified the PROXYLIB campaign, which abused Android devices infected with proxyware from LumiApps and Asocks.
- Residential proxies offer legitimate benefits (e.g., accessing geo‑restricted content) but are frequently exploited by cybercriminals to conceal attack traffic.
- Devices become part of a botnet when attackers gain remote access, install malware, and conscript the hardware into a command‑and‑control network.
- Recommended defenses include keeping OSes patched, monitoring edge devices, using strong passwords and two‑factor authentication, installing apps only from trusted sources, changing default credentials, and securing Wi‑Fi with WPA2/WPA3.
Overview of the Botnet Takedown
Dutch authorities announced the successful disruption of a large‑scale botnet that had enslaved millions of consumer and industrial devices. The operation was carried out jointly by the Dutch Politie and the National Cyber Security Center (NCSC), marking one of the most significant botnet takedowns in recent European cyber‑crime history. Law‑enforcement agencies coordinated with ISPs, hosting providers, and international partners to locate and neutralize the malicious infrastructure. The action followed months of intelligence gathering that revealed the botnet’s role in facilitating a variety of cyber attacks, including credential stuffing, distributed denial‑of‑service (DDoS) assaults, and fraudulent advertising clicks. By dismantling the command‑and‑control (C2) nodes, officials aimed to halt ongoing malicious activity and prevent further victimization of both private users and enterprises.
Scale and Infrastructure of the Botnet
According to the NCSC statement, the botnet consisted of at least 17 million compromised devices spanning multiple categories: traditional PCs, laptops, tablets, smartphones, and a growing number of Internet‑of‑Things (IoT) appliances such as smart cameras, routers, and home automation hubs. The sheer size of the network gave attackers considerable bandwidth and geographic diversity, making detection and attribution challenging. Supporting this massive device fleet were more than 200 servers physically located in the Netherlands, which acted as the backbone for issuing commands, distributing malware updates, and aggregating stolen data. The concentration of servers in a single jurisdiction facilitated the subsequent law‑enforcement seizure, as Dutch authorities could obtain warrants and work directly with local hosting companies.
Law Enforcement Actions and Server Seizure
The NCSC reported that police officials seized a subset of these 200+ servers from a hosting provider that had been leasing the infrastructure to the botnet operators. Upon identification of the servers’ malicious use, the provider voluntarily took the affected services offline, effectively cutting off a critical portion of the botnet’s C2 capability. This collaborative approach—where the hosting provider acted responsibly after being notified—illustrates a growing trend of public‑private cooperation in combating cyber threats. The seizure also allowed forensic analysts to capture logs, malware samples, and configuration files, which are expected to aid in attributing the operation to specific threat actors and in building legal cases against them.
Connection to Asocks and Residential Proxy Services
Although the Dutch authorities did not formally name the botnet, local media outlet NL Times linked the takedown to Asocks, a company that markets residential, mobile, and corporate proxy services. Asocks’ website advertises proxy packages priced between $5 and $15 per month, with volume discounts of 5‑15 % for bundles ranging from 10 to 100 proxies. Residential proxies route traffic through IP addresses assigned to genuine residential internet connections, thereby masking the true origin of the user. While such services have legitimate applications—such as accessing geo‑restricted content, conducting market research, or preserving privacy—they are also attractive to cybercriminals who seek to blend malicious traffic with legitimate user activity to evade detection.
The PROXYLIB Campaign and Android Infections
In April 2024, HUMAN’s Satori Threat Intelligence team detailed a campaign dubbed PROXYLIB that abused Android devices infected with proxyware supplied by LumiApps and integrated with Asocks’ proxy network. The malware covertly turned compromised smartphones and tablets into relay nodes, routing attackers’ traffic through the devices’ residential IP connections. This technique allowed threat actors to conduct credential‑stuffing attacks, ad‑fraud schemes, and scraping operations while appearing to originate from ordinary household internet users. The PROXYLIB incident highlighted how mobile platforms, often overlooked in traditional botnet analyses, can become significant contributors to large‑scale proxy‑based abuse when infected with seemingly benign‑looking apps that request excessive permissions.
Business Model and Pricing of Asocks
Asocks operates on a subscription model, offering tiered plans based on the number of concurrent proxies a customer requires. Entry‑level plans start at roughly $5 per month for a single proxy, scaling up to $15 per month for higher‑tier packages, with discounts applied when purchasing bundles of 10‑100 proxies. The service emphasizes ease of use, providing API access, dashboard controls, and automatic IP rotation. While the pricing is attractive to legitimate users such as developers needing diverse geolocations for testing, the low cost and ease of acquisition also lower the barrier for malicious actors seeking large volumes of residential IPs for illicit purposes. The business model’s reliance on a vast pool of device‑resident IPs inadvertently creates a supply chain that can be exploited when those devices are compromised.
Legitimate Uses vs. Abuse of Residential Proxies
Residential proxies provide genuine advantages: they enable users to bypass regional content restrictions, conduct accurate localized SEO checks, and perform web scraping without triggering anti‑bot mechanisms that often block data‑center IPs. Journalists, researchers, and multinational corporations frequently rely on such services for legitimate intelligence gathering. However, the same attributes that make residential proxies valuable for privacy and accessibility also make them ideal for obfuscating malicious traffic. Attackers can launch credential‑stuffing campaigns, distribute malware, or execute fraudulent transactions while appearing to originate from ordinary residential internet connections, thereby reducing the likelihood of IP‑based blacklisting or rate‑limiting triggers.
How Devices Become Botnet Members
The NCSC explained that devices join a botnet when threat actors achieve remote code execution—typically through exploiting unpatched vulnerabilities, leveraging weak or default credentials, or tricking users into installing malicious applications. Once inside, attackers deploy malware that establishes a persistent backdoor, enabling the device to receive commands from a C2 server. The compromised hardware can then be instructed to perform a variety of tasks: sending spam, participating in DDoS floods, acting as a proxy for anonymized traffic, or harvesting sensitive data. In the case of the recent botnet, many of the enslaved devices were repurposed as residential‑proxy nodes, allowing attackers to route malicious requests through seemingly trustworthy IP addresses.
Mitigation Strategies Recommended by Authorities
To reduce the risk of device conscription, the NCSC and Dutch police issued a set of best‑practice recommendations for both individuals and organizations:
- Keep operating systems and firmware up to date to close known vulnerabilities.
- Maintain visibility of edge devices (routers, modems, IoT gateways) through network monitoring and inventory management.
- Use strong, unique passwords and change default credentials on all devices.
- Enable two‑factor authentication (2FA) wherever supported, especially for administrative interfaces.
- Install applications only from trusted sources (official app stores, verified vendors) and scrutinize requested permissions.
- Secure Wi‑Fi networks with WPA2 or preferably WPA3 encryption, and disable WPS and UPnP when not needed.
- Regularly audit and segment networks, isolating critical systems from guest or IoT segments to limit lateral movement.
Adopting these measures can significantly lower the likelihood that a device will be recruited into a botnet or used as a proxy node for cybercriminal activity.
Implications and Ongoing Threat Landscape
The takedown of this 17‑million‑device botnet underscores the evolving nature of cyber threats, where traditional malware‑driven botnets are increasingly intertwined with legitimate‑looking services such as residential proxies. As attackers continue to abuse proxy networks to conceal their actions, defenders must expand their focus beyond endpoint protection to include monitoring of anomalous outbound traffic, scrutiny of third‑party service usage, and collaboration with service providers to identify and suspend abusive accounts. The incident also serves as a reminder that the security of consumer‑grade IoT and mobile devices remains a weak link; until manufacturers and users prioritize hardened firmware, timely updates, and secure configurations, large‑scale botnets built from everyday gadgets will persist as a potent tool in the cybercriminal arsenal. Continued vigilance, public awareness, and cross‑sector cooperation will be essential to curb the proliferation of such threats moving forward.