Log4Shell Exploited To Infect VMware Horizon Servers With Backdoors, Crypto Miners

An anonymous reader quotes a report from ZDNet: The Log4Shell vulnerability is being actively exploited to deliver backdoors and cryptocurrency miners to vulnerable VMware Horizon servers. On Tuesday, Sophos cybersecurity researchers said the attacks were first detected in mid-January and are ongoing. Not only are backdoors and cryptocurrency miners being deployed, but in addition, scripts are used to gather and steal device information. Log4Shell is a critical vulnerability in Apache Log4J Java logging library. The unauthenticated remote code execution (RCE) vulnerability was made public in December 2021 and is tracked as CVE-2021-44228 with a CVSS score of 10.0. According to Sophos, the latest Log4Shell attacks target unpatched VMware Horizon servers with three different backdoors and four cryptocurrency miners. The attackers behind the campaign are leveraging the bug to obtain access to vulnerable servers. Once they have infiltrated the system, Atera agent or Splashtop Streamer, two legitimate remote monitoring software packages, may be installed, with their purpose twisted into becoming backdoor surveillance tools. The other backdoor detected by Sophos is Silver, an open source offensive security implant released for use by pen testers and red teams. Sophos says that four miners are linked to this wave of attacks: z0Miner, JavaX miner, Jin, and Mimu, which mine for Monero (XMR). Previously, Trend Micro found z0Miner operators were exploiting the Atlassian Confluence RCE (CVE-2021-26084) for cryptojacking attacks. A PowerShell URL connected to this both campaigns suggests there may also be a link, although that is uncertain. [...] In addition, the researchers uncovered evidence of reverse shell deployment designed to collect device and backup information.

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