Hackers Target Apache HTTP Server Vulnerability to Deploy Linuxsys Cryptocurrency Miner
On July 17, 2025, cybersecurity experts reported a dangerous campaign exploiting a vulnerability in the Apache HTTP Server, enabling attackers to deploy a cryptocurrency miner known as Linuxsys. This specific flaw, identified as CVE-2021-41773, carries a high severity rating (CVSS score: 7.5) and affects Apache HTTP Server version 2.4.49. The path traversal vulnerability can lead to remote code execution, allowing malicious actors to execute commands on compromised systems.
The attack leverages compromised legitimate websites for malware distribution, a technique that enhances the stealthiness of the delivery method and aids in evading detection. Jacob Baines from VulnCheck highlighted this strategy in a recent report shared with The Hacker News. The observed infection sequence, traced back to an Indonesian IP address, specifically 103.193.177[.]152, indicates a coordinated effort to distribute the malicious payload.
Upon successful exploitation, the attackers use tools like curl or wget to fetch a next-stage payload from “repositorylinux[.]org.” This payload is essentially a shell script, which is programmed to download the Linuxsys cryptocurrency miner from several legitimate websites. This multifaceted approach suggests a mature level of organization and strategic planning behind the campaign.
Business owners must be acutely aware of the risks associated with such vulnerabilities. Compromised systems can not only lead to financial loss but can also erode consumer trust and damage brand credibility. The tactics employed in this attack align with several categories outlined in the MITRE ATT&CK framework. The methods used likely include initial access and execution, where attackers gain entry through exploiting the vulnerability and subsequently execute payloads to establish persistence within the affected environment.
In addition, tactics such as privilege escalation may have been utilized to gain enhanced access within the compromised machines, facilitating the deployment of the Linuxsys miner. The reliance on trusted web resources for malware delivery underscores the importance of comprehensive web security protocols for organizations.
As the cybersecurity landscape continues to evolve, it is essential for business owners to stay informed about emerging threats and vulnerabilities. Proactive measures, including regular software updates and vulnerability assessments, can be critical in safeguarding systems against such malicious campaigns. Awareness of potential tactics, as laid out in frameworks like MITRE ATT&CK, will enable organizations to bolster their defenses and mitigate risks effectively.
