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E-commerce platforms in the U.S., Germany, and France have come under attack from a new form of malware that targets Nginx servers in an attempt to masquerade its presence and slip past detection by security solutions.

“This novel code injects itself into a host Nginx application and is nearly invisible,” Sansec Threat Research team said in a new report. “The parasite is used to steal data from eCommerce servers, also known as ‘server-side Magecart.'”

A free and open-source software, Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy, and HTTP cache. NginRAT, as the advanced malware is called, works by hijacking a host Nginx application to embed itself into the webserver process.

The remote access trojan itself is delivered via CronRAT, another piece of malware the Dutch cybersecurity firm disclosed last week as hiding its malicious payloads in cron jobs scheduled to execute on February 31st, a non-existent calendar day.

Both CronRAT and NginRAT are designed to provide a remote way into the compromised servers, and the goal of the intrusions is to make server-side modifications to the compromised e-commerce websites in a manner that enable the adversaries to exfiltrate data by skimming online payment forms.

images from Hacker News