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As people probably know by now, some hackers released a trojan "HiddenWasp" into the Linux world.

Article from Intezer:
https://www.intezer.com/blog-hiddenwasp-malware-targeting-linux-systems/

So far I have not seen what the initial cause of getting infected is and how to prevent it, but I've read something about looking for a user "sftp" which is created by the trojan script, and then looking inside /etc/rc.local since it is supposed to only have "exit 0". The script appends some code to that file apparently.

There is also a hint to look for "ld.so" files that don't have string "/etc/ld.so.preload"

They mention that prevention can be done by blocking Command-and-Control IP addresses detailed on the article site.

How do i block off specific IP-addresses?

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You would configure iptables (see your specific distro documentation) to block connections to the IP-addresses in that article, however it is likely these Command-and-Control addresses would frequently change.

There are also options such as configuring AppArmour for the specific distro you are using, or security focused desktop distros such as Qubes OS that run browsers and other programs in their own container, or other sandboxing programs such as nsjail to possibly prevent infection however since the article indicates the attack vector is not yet known it's not immediately clear the best way to defend against HiddenWasp.

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