The Zscaler ThreatLabz 2023 Enterprise IoT and OT Threat Report says the increasing frequency of malware attacks targeting IoT devices is a significant concern for OT security, as the mobility of malware can facilitate movement across different networks, potentially endangering critical OT infrastructure.
“Weak enforcement of security standards for IoT device manufacturers coupled with the proliferation of shadow IoT devices at the enterprise level poses a significant threat to global organisations. Often, threat actors target ‘unmanaged and unpatched’ devices to gain an initial foothold into the environment,” said Deepen Desai, global CISO and head of security research at Zscaler.
He encourages organisations to enforce zero trust principles when securing IoT and OT devices - never trust, always verify, and assume breach. “Organisations can eliminate lateral movement risk by utilizing continuous discovery and monitoring processes to segment these devices,” he continued.
Consistent growth in attacks
With the steady adoption of IoT and personal connected devices, the report found an increase of over 400% in IoT malware attacks year-over-year. The growth in cyber threats demonstrates cyber criminals’ persistence and ability to adapt to evolving conditions in launching IoT malware attacks.
Additionally, research indicates that cybercriminals are targeting legacy vulnerabilities, with 34 of the 39 most popular IoT exploits specifically directed at vulnerabilities that have existed for over three years.
The Mirai and Gafgyt malware families continue to account for 66% of attack payloads, creating botnets from infected IoT devices that are then used to launch denial-of-service (DDoS) attacks against lucrative businesses.
Botnet-driven distributed DDoS attacks are responsible for billions of dollars in financial losses across industries around the globe. In addition, DDoS attacks pose a risk to OT by potentially disrupting critical industrial processes and even endangering human lives.
Industries favoured by attackers
Manufacturing and retail accounted for nearly 52% of IoT device traffic, with 3D printers, geolocation trackers, industrial control devices, automotive multimedia systems, data collection terminals, and payment terminals sending the majority of signals over digital networks.
However, the quantity of device traffic has created opportunities for cybercriminals, and the manufacturing sector now sees an average of 6,000 IoT malware attacks every week.
Moreover, these substantial IoT malware attacks can disrupt critical OT processes, which are integral in many industrial manufacturing plants like automotive, heavy manufacturing, and plastic & rubber.
This creates long-term challenges for security teams at manufacturing businesses but also demonstrates that industrial IoT holds a substantial lead in adopting unique IoT devices (nearly three times more than other sectors). This increase is critical as manufacturing organisations continue adopting IoT tools for automation and digitization of legacy infrastructure.
Education is another sector that suffered from outsized attention from cybercriminals in 2023, with the propagation of unsecured as well as shadow IoT devices within school networks providing attackers with easier access points.
The wealth of personal data stored on their networks has made educational institutions particularly attractive targets, leaving students and administrations vulnerable. In fact, the report found IoT malware attacks in the education sector increased by nearly 1000%.
