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A new and sophisticated malware campaign, named PolarEdge, has been discovered targeting edge devices from major manufacturers like Cisco, ASUS, QNAP, and Synology. The malware seeks to integrate vulnerable devices into a botnet, exploiting security weaknesses to perform malicious actions. Discovered at the end of 2023, this threat is notable for its ability to infect a wide variety of edge devices and its use of previously undocumented exploits.
Summary:
The PolarEdge botnet has been actively targeting several popular networking devices from Cisco, ASUS, QNAP, and Synology since late 2023. This botnet uses CVE-2023-20118, a critical vulnerability in Cisco routers, to gain unauthorized access to devices. The vulnerability affects routers that have reached their end-of-life (EoL) status and remain unpatched. The attackers exploit this flaw to deploy a TLS backdoor implant, which allows them to remotely control the device.
The malware, which operates through a shell script, enables the attacker to perform a variety of actions such as logging cleanup, process termination, and the downloading of malicious payloads. The backdoor is persistent, modifying system files to ensure it runs continuously. The botnet, which has already infected over 2,000 devices globally, likely serves as a tool for larger-scale cyberattacks, with its purpose still unclear.
Similar payloads have been found targeting devices from other manufacturers, and the malware’s distribution is traced to Huawei Cloud infrastructure. This threat is sophisticated, involving multiple vulnerabilities and payloads across different devices. The scale of the botnet’s activities suggests that it is the work of skilled operators and poses a substantial cyber threat.
What Undercode Say:
The PolarEdge botnet’s deployment highlights the evolving nature of cyber threats targeting edge devices, which have become increasingly common in today’s interconnected world. These devices are often overlooked in terms of security, as many still run outdated firmware or remain unpatched after reaching end-of-life status. In this case, Cisco routers that are no longer supported by the manufacturer remain prime targets, underscoring a critical issue in device lifecycle management and cybersecurity.
The CVE-2023-20118 vulnerability, which allows attackers to execute arbitrary commands on the affected routers, is a perfect example of how unpatched devices can be exploited by malicious actors. Even when Cisco recommended mitigations like disabling remote management and blocking certain ports, these efforts were not enough to stop the attackers, demonstrating the need for proactive measures beyond mere recommendations.
The sophistication of the malware itself—its ability to perform multiple tasks like deleting logs, terminating processes, and ensuring persistence by modifying key system files—points to a highly organized and well-funded threat group. This level of complexity indicates that the operators behind the PolarEdge botnet are likely to be professional cybercriminals or state-sponsored actors with the resources to target a variety of devices and adapt their methods to bypass security defenses.
PolarEdge’s ability to spread across different types of devices—affecting Cisco, ASUS, QNAP, and Synology hardware—also speaks to the botnet’s versatility. By exploiting a wide range of vulnerabilities, the attackers can ensure their botnet’s growth, making it harder to shut down. This modular approach could allow them to carry out various cybercrime activities, from launching denial-of-service (DoS) attacks to infiltrating sensitive networks for data exfiltration or espionage.
The PolarEdge botnet’s persistence and its ability to evade detection through sophisticated methods, like using a TLS backdoor and FTP for payload distribution, further reinforce the need for better monitoring of edge devices. Even seemingly benign activities, like FTP file retrieval or client connection attempts, may indicate a larger cyberattack in the making. Security teams must take a more comprehensive approach to device security by integrating behavior analytics, anomaly detection, and continuous patching to defend against such threats.
Given the global scope of the infections—spanning regions such as the United States, Taiwan, Russia, India, and others—it’s clear that PolarEdge is a widespread threat with potentially serious geopolitical implications. If the malware’s end goal is to create a network of compromised devices that can be used for cyberattacks, it could have a significant impact on critical infrastructure or private enterprises.
In conclusion, PolarEdge represents a concerning evolution in botnet tactics, showing that even highly specific, previously undocumented vulnerabilities can be exploited to create substantial threats. The scale and sophistication of this botnet illustrate that attackers are increasingly targeting a wide range of devices, using multiple tactics to build a powerful, long-lasting cyber weapon.
Fact Checker Results
- Vulnerability Identification: The CVE-2023-20118 vulnerability does exist and has a CVSS score of 6.5. Cisco’s advisory did suggest mitigations, but these were not enough to stop exploitation.
- Botnet Scope: The PolarEdge botnet is confirmed to have infected over 2,000 devices globally. The information on IP addresses and geographic distribution is accurate.
- Payload Details: The backdoor implant, known as “cipher_log,” is indeed designed to ensure persistence and remote control of infected devices.
References:
Reported By: https://thehackernews.com/2025/02/polaredge-botnet-exploits-cisco-and.html
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