The perfctl malware has been targeting vulnerabilities and misconfigurations in millions of Linux systems, likely infecting thousands.

Thousands of machines running Linux have been infected by a malware strain that’s notable for its stealth, the number of misconfigurations it can exploit, and the breadth of malicious activities it can perform, researchers reported Thursday.

Exploiting a catalog of 20,000 misconfigurations to infect Linux servers, the cryptomining malware has gone largely undetected through use of process masquerading but appears capable of more.

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Linux systems are being targeted by a dangerous new malware that can serve as a loader, a proxy, and a cryptocurrency miner. Called Perfctl, the malware was recently spotted by cybersecurity researchers from Aqua Security,