eCommerce servers are being targeted with remote access malware that hides on Nginx servers in a way that makes it virtually invisible to security solutions.
The threat received the name NginRAT, a combination of the application it targets and the remote access capabilities it provides and is being used in server-side attacks to steal payment card data from online stores.
NginRAT was found on eCommerce servers in North America and Europe that had been infected with CronRAT, a remote access trojan (RAT) that hides payloads in tasks scheduled to execute on an invalid day of the calendar.
NginRAT has infected servers in the U.S., Germany, and France where it injects into Nginx processes that are indistinguishable from legitimate ones, allowing it to remain undetected.
RATs enable server-side code modification
Researchers at security company Sansec explain that the new malware is delivered CronRAT, although both of them fulfill the same function: providing remote access to the compromised system.
Willem de Groot, director of threat research at Sansec, told BleepingComputer that while using very different techniques to maintain their stealth, the two RATs appear to have the same role, acting as a backup for preserving remote access.
Whoever is behind these strains of malware, is using them to modify server-side code that allowed them to record data submitted by users (POST requests).
Sansec was able to study NginRAT after creating a custom CronRAT and observing the exchanges with the command and control server (C2) located in China.
The researchers tricked the C2 into sending and executing a rogue shared library payload, as part of the normal malicious interaction, d ..
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