A Vulnerability Discovered in Windows, macOS, and Linux

Malware targeting multiple operating systems has become quite popular lately. A cybersecurity company, in December 2021 Windows, Mac and Linux discovered a new vulnerability that poses a threat to

A group of researchers from software security firm Intezer discovered malware on an educational institution’s Linux-based Web server. Researchers have fixed the Back Door error, which they call SysJoker. announced their discovery and gave information about the vulnerability.

May lead to espionage and ransomware attacks

The vulnerability, named SysJoker, which was first discovered during an attack on an educational institution’s Linux-based Web server, turned out to be seen in Mac and Windows versions with further research. A looks like a system update this software posed a serious threat to users.

The vulnerability created the control server domain by decoding a string retrieved from a text file in Google Drive. Vulnerability SysJoker written in C++ programming language; It was not detected in VirusTotal, the Linux, Windows, or Mindows malware search engine. During the researchers’ analysis, the server changed three times, this attacker’s is active and monitoring infected devices showed.

The first reason the discovery of this malware was significant is that this vulnerability works with a hybrid build and not for a specific operating system like the others. It threatened all platforms. Another reason was that this vulnerability was written from scratch using four separate command and control servers. This showed that the people who developed and used it invested significant resources.

As a result of monitoring targeted organizations and malware, researchers found SkyJoker’s espionage and ransomware attack stated that it could lead to