Kernel module directory modified
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Goal
Kernel modules can be used to automatically execute code when a host starts up. Attackers sometimes use kernel modules to gain persistence on a particular host, ensuring that their code is executed even after a system reboot. Kernel modules can also help attackers gain elevated permissions on a system.
Loading a malicious kernel module is a type of rootkit. Rootkits often create backdoor access and hide evidence of themselves. This includes process, file, and network activity.
Strategy
Kernel modules are loaded from the /lib/modules directory in Linux. This detection watches for all new files created under that directory.
Triage and response
- Check the name of the new kernel module created.
- Check which user or process created the module.
- If the new kernel module is not expected, contain the host or container and roll back to a known good configuration. Initiate the incident response process.
Requires Agent version 7.27 or greater
