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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Thousands of Linux systems infected by "perfctl" malware since 2021 (arstechnica.com)

submitted 1 month ago by [email protected] to c/[email protected]

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TLDR: perfctl is a crypto mining and proxy jacking malware that exploits about 20’000 common missconfigurations to install itself on Linux servers. Mostly using a 10/10 CVE on Apache RocketMQ.

It is very persistent and can reinstall itself even when you have deleted all the perfctl and perfcc files. It hides itself by removing logs, network packets, and stopping all activity once you login to the machine.

Monitoring cpu usage using tools (I use net data on my server) can help identify infections (100% cpu usage when « idle »).

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[–] [email protected] 17 points 1 month ago (2 children)

The malware also uses advanced evasion techniques, such as suspending its activity when it detects a new user in the btmp or utmp files and terminating any competing malware to maintain control over the infected system.

So, is it a fairly decent antivirus mixed in with all the malware?

[–] [email protected] 9 points 1 month ago (1 children)

There can only be one.

[–] [email protected] 1 points 1 month ago

There can only be... NONE!

[–] [email protected] 2 points 1 month ago

Sounds like Windows Defender