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Attackers using Log4Shell vulnerability to deliver backdoors

By Shannon Williams
Fri 1 Apr 2022

Attackers are using the Log4Shell vulnerability to deliver backdoors and profiling scripts to unpatched VMware Horizon servers, paving the way for persistent access and future ransomware attacks, according to new research from Sophos.

A new technical paper, Horde of Miner Bots and Backdoors Leveraged Log4J to Attack VMware Horizon Servers, details the tools and techniques used to compromise the servers and deliver three different backdoors and four Cryptominers. The backdoors are possibly delivered by Initial Access Brokers.

Log4Shell is a remote code execution vulnerability in the Java logging component, Apache Log4J, which is embedded in hundreds of software products. It was reported and patched in December 2021. 

"Widely used applications such as VMware Horizon that are exposed to the internet and need to be manually updated, are particularly vulnerable to exploitation at scale," says Sean Gallagher, senior security researcher at Sophos.

"Sophos detections reveal waves of attacks targeting Horizon servers, starting in January, and delivering a range of backdoors and cryptominers to unpatched servers, as well as scripts to collect some device information," he explains. 

"Sophos believes that some of the backdoors may be delivered by Initial Access Brokers looking to secure persistent remote access to a high value target that they can sell on to other attackers, such as ransomware operators," Gallagher adds.

The multiple attack payloads Sophos detected using Log4Shell to target vulnerable Horizon servers include:

  • Two legitimate remote monitoring and management tools, Atera agent and Splashtop Streamer, likely intended for malicious use as backdoors
  • The malicious Sliver backdoor 
  • The cryptominers z0Miner, JavaX miner, Jin and Mimu
  • Several PowerShell-based reverse shells that collect device and backup information
  • Sophos analysis revealed that Sliver is sometimes delivered together with Atera and PowerShell profiling scripts and is used to deliver the Jin and Mimu variants of the XMrig Monero miner botnet

According to Sophos, the attackers are using several different approaches to infect targets. While some of the earlier attacks used Cobalt Strike to stage and execute the cryptominer payloads, the largest wave of attacks that began in mid-January 2022, executed the cryptominer installer script directly from the Apache Tomcat component of the VMware Horizon server. This wave of attacks is ongoing.

"Sophos findings suggest that multiple adversaries are implementing these attacks, so the most important protective step is to upgrade all devices and applications that include Log4J with the patched version of the software," says Gallagher. 

"This includes patched versions of VMware Horizon if organisations use the application in their network. Log4J is installed in hundreds of software products and many organisations may be unaware of the vulnerability lurking within their infrastructure, particularly in commercial, open source or custom software that doesn't have regular security support. 

"And while patching is vital, it wont be enough if attackers have already been able to install a web shell or backdoor in the network. Defense in depth and acting upon any detection of miners and other anomalous activity is critical to avoid falling victim to such attacks," he says.

Sophos has closely monitored attack activity related to the Log4Shell vulnerability and has published a number of in depth technical and advisory reports, including  Log4Shell Hell Anatomy of an Exploit Outbreak, Log4Shell Response and Mitigation Recommendations, Inside the Code: How the Log4Shell Exploit Works, and Log4Shell: No Mass Abuse, But No Respite, What Happened?

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