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Attackers can leverage malicious kernel modules to gain persistence on a system, ensuring their malicious code is executed even after a system reboot. Kernel modules can also help attackers gain elevated permissions and cover their tracks through the use of a rootkit.
Loading a malicious kernel module can be a type of rootkit. Rootkits often create backdoor access and hide evidence of themselves. This includes process, file, and network activity.
Kernel modules are loaded from the /lib/modules
directory in Linux by default, however attackers may attempt to load kernel modules from other locations as well. This detection detects all kernel module loads.
This rule uses the New Value detection method. Datadog will learn the historical behavior of a specified field in agent logs and then create a signal when unfamiliar values appear.