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How to detect what is starting malicious processes on my server?

id flag

I recently noticed an exceptionally high outbound bandwidth from my Ubuntu 22.04 server. I saw a process with a random name (something like sdfgardfh) with a high CPU usage, and suspected that it caused the bandwidth overage. I killed the process, but immediately afterwards, a new similar process started, with a different random name (something like ktsdfyhr). I rebooted the server, but immediately after the reboot, I saw a third process with a different random name (something like fkjytedb). I suspect some malicious code is running on my server. How can I debug this?

Gmck avatar
tr flag
Have you scanned with clamav or chkrootkit? [https://www.chkrootkit.org]
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