There has recently been a rise in the botnet activity created by the Chinese threat group Volt Typhoon, which leverages similar techniques and infrastructure as those previously created by the group. SecurityScorecard reports that the botnet has recently made a comeback and is now active again. It was only in May of 2023 that Microsoft discovered that the Volt Typhoon was stealing data from critical infrastructure organizations in Guam, which it linked to the Chinese government. This knowledge came as a result of a spy observing the threat actor stealing data from critical infrastructure organizations on US territory. 

Several Cisco and Netgear routers have been compromised by Chinese state-backed cyber espionage operation Volt Typhoon since September, to rebuild its KV-Botnet malware, which had previously been disrupted by the FBI and was unsuccessfully revived in January, reports said. A report by Lumen Technologies' Black Lotus Labs released in December 2023 revealed that outdated devices mostly powered Volt Typhoon's botnet from Cisco, Netgear, and Fortinet. 

The botnet was used to transfer covert data and communicate over unsecured networks. The US government recently announced that the Volt Typhoon botnet had been neutralized and would cease to operate. Leveraging the botnet's C&C mechanisms, the FBI remotely removed the malware from the routers and changed the router's IP address to a port that is not accessible to the botnet. 

Earlier this month, in response to a law enforcement operation aimed at disrupting the KV-Botnet malware botnet, Volt Typhoon, which is widely believed to be sponsored by the Chinese state, has begun to rebuild its malware botnet after law enforcement officials disrupted it in January. Among other networks around the world, Volt Typhoon is considered one of the most important cyberespionage threat groups and is believed to have infiltrated critical U.S. infrastructure at least for the past five years. 

To accomplish their objectives, they hack into SOHO routers and networking devices, such as Netgear ProSAFE firewalls, Cisco RV320s, DrayTek Vigor routers, and Axis IP cameras, and install proprietary malware that establishes covert communication channels and proxies, as well as maintain persistent access to targeted networks through persistent access. 

Volt Typhoon was a malicious botnet created by a large collection of Cisco and Netgear routers that were older than five years, and, therefore, were not receiving security updates as they were near the end of their life cycle as a result of having reached end-of-life (EOL) status. This attack was initiated by infecting devices with the KV Botnet malware and using them to hide the origin of follow-up attacks targeting critical national infrastructure (CNI) operations located in the US and abroad. 

There has been no significant change in Volt Typhoon's activity in the nine months since SecurityScorecard said they observed signs of it returning, which makes it seem that it is not only present again but also "more sophisticated and determined". Strike team members at SecurityScorecard have been poring over millions of data points collected from the organization's wider risk management infrastructure as part of its investigation into the debacle and have come to the conclusion that the organization is now adapting and digging in in a new way after licking its wounds in the wake of the attack. 

In their findings, the Strike Team highlighted the growing danger that the Volt Typhoon poses to the environment. To combat the spread of the botnet and its deepening tactics, governments and corporations are urgently needed to address weaknesses in legacy systems, public cloud infrastructures, and third-party networks, says Ryan Sherstobitoff, the senior vice president of SecurityScorecard's threat research and intelligence. "Volt Typhoon is not only a botnet that has resilience, but it also serves as a warning computer virus. 

In the absence of decisive action, this silent threat could trigger a critical infrastructure crisis driven by unresolved vulnerabilities, leading to a critical infrastructure disaster." It has been observed that Volt Typhoon has recently set up new command servers to evade the authorities through the use of hosting services such as Digital Ocean, Quadranet, and Vultr. Afresh SSL certificates have also been registered to evade the authorities as well. 

The group has escalated its attacks by exploiting legacy Cisco RV320/325 and Netgear ProSafe router vulnerabilities. According to Sherstobitoff, even in the short period that it took for the operation to be carried out, 30 per cent of the visible Cisco RV320/325 network equipment around the world was compromised. According to SecurityScorecard, which has been monitoring this matter for BleepingComputer, the reason behind this choice is likely to be based on geographical factors by the threat actors.

It would seem that the Volt Typhoon botnet will return to global operations soon; although the size of the botnet is nowhere near its previous size, it is unlikely that China's hackers will give up on their mission to eradicate the botnet. As a preventative measure, older routers should be replaced with more current models and placed behind firewalls. Remote access to admin panels should not be made open to the internet, and passwords for admin accounts should be changed to ensure that this threat is not created. 

To prevent exploitation of known vulnerabilities, it is highly recommended that you use SOHO routers that are not too old to install the latest firmware when it becomes available. Among the areas in which the security firm has found similarities between the previous Volt Typhoon campaigns and the new version of the botnet are its fundamental infrastructure and techniques. A vulnerability in the VPN of a remote access point located on the small Pacific island of New Caledonia was found by SecurityScorecard's analysis. As the network was previously shut down, researchers observed it being used once again to route traffic between the regions of Asia-Pacific and America, although the system had been taken down previously.