Shells Modifying Files in Known Linux Kernel Modules Directories

 1title: Shells Modifying Files in Known Linux Kernel Modules Directories
 2id: 173fa93c-88ce-4d3f-89de-cfc849a94821
 3status: experimental
 4description: |
 5    Detects configuration files being written to specific directories that are searched when 
 6    looking for loadable Linux Kernel Modules (LKM). Part of the RedCanary 2024 Threat Detection 
 7    Report.    
 8references:
 9    - https://redcanary.com/threat-detection-report/techniques/kernel-modules-and-extensions/
10author: RedCanary, Sigma formatting by Micah Babinski
11date: 2024/03/21
12tags:
13    - attack.persistence
14    - attack.privilege_escalation
15    - attack.t1547
16    - attack.t1547.006
17logsource:
18    product: linux
19    category: file_event
20detection:
21    selection:
22        Image|endswith:
23            - '/bash'
24            - '/sh'
25            - '/dash'
26            - '/zsh'
27        TargetFilename|contains:
28            - '/lib/modules/*/'
29            - '/etc/modules-load.d/'
30            - '/lib/modules-load.d/'
31            - '/usr/lib/modules-load.d/'
32            - '/usr/local/lib/modules-load.d/'
33    condition: selection
34falsepositives:
35    - Unknown
36level: low```