linux_rootkit.md

title	Linux Rootkit
last_modified_at	2022-07-27
toc	true
toc_label
tags	Splunk Enterprise Splunk Enterprise Security Splunk Cloud Endpoint Exploitation Reconnaissance

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Description

Adversaries may use rootkits to hide the presence of programs, files, network connections, services, drivers, and other system components. Rootkits are programs that hide the existence of malware by intercepting/hooking and modifying operating system API calls that supply system information.

• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Endpoint
• Last Updated: 2022-07-27
• Author: Michael Haag, Splunk
• ID: e30f4054-ac08-4999-b8bc-5cc46886c18d

Narrative

Rootkits or rootkit enabling functionality may reside at the user or kernel level in the operating system or lower, to include a hypervisor, Master Boot Record, or System Firmware. Rootkits have been seen for Windows, Linux, and Mac OS X systems. Linux rootkits may not standout as much as a Windows rootkit, therefore understanding what kernel modules are installed today and monitoring for new is important. As with any rootkit, it may blend in using a common kernel name or variation of legitimate names.

Detections

Name	Technique	Type
Linux File Created In Kernel Driver Directory	Kernel Modules and Extensions, Boot or Logon Autostart Execution	Anomaly
Linux Insert Kernel Module Using Insmod Utility	Kernel Modules and Extensions, Boot or Logon Autostart Execution	Anomaly
Linux Install Kernel Module Using Modprobe Utility	Kernel Modules and Extensions, Boot or Logon Autostart Execution	Anomaly
Linux Kernel Module Enumeration	System Information Discovery, Rootkit	Anomaly

Reference

• https://attack.mitre.org/techniques/T1014/
• https://content.fireeye.com/apt-41/rpt-apt41
• https://medium.com/chronicle-blog/winnti-more-than-just-windows-and-gates-e4f03436031a

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