mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
tccontre
67 lines
2.5 KiB
YAML
67 lines
2.5 KiB
YAML
name: Linux Auditd Kernel Module Enumeration
|
|
id: d1b088de-c47a-4572-9339-bdcc26493b32
|
|
version: 1
|
|
date: '2024-08-09'
|
|
author: Teoderick Contreras, Splunk
|
|
status: production
|
|
type: Anomaly
|
|
description: The following analytic identifies the use of the 'kmod' process to list
|
|
kernel modules on a Linux system. This detection leverages data from Endpoint Detection
|
|
and Response (EDR) agents, focusing on process names and command-line executions.
|
|
While listing kernel modules is not inherently malicious, it can be a precursor
|
|
to loading unauthorized modules using 'insmod'. If confirmed malicious, this activity
|
|
could allow an attacker to load kernel modules, potentially leading to privilege
|
|
escalation, persistence, or other malicious actions within the system.
|
|
data_source:
|
|
- Linux Auditd Syscall
|
|
search: '`linux_auditd` type=SYSCALL comm=lsmod | stats count min(_time) as firstTime
|
|
max(_time) as lastTime by comm exe SYSCALL UID ppid pid success | `security_content_ctime(firstTime)`|
|
|
`security_content_ctime(lastTime)` | `linux_auditd_kernel_module_enumeration_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process complete command-line executions.
|
|
These logs must be processed using the appropriate Splunk Technology Add-ons that
|
|
are specific to the EDR product. Use the Splunk Common Information Model (CIM) to
|
|
normalize the field names and speed up the data modeling process.
|
|
known_false_positives: False positives are present based on automated tooling or system
|
|
administrative usage. Filter as needed.
|
|
references:
|
|
- https://man7.org/linux/man-pages/man8/kmod.8.html
|
|
tags:
|
|
analytic_story:
|
|
- Linux Rootkit
|
|
asset_type: Endpoint
|
|
confidence: 50
|
|
impact: 30
|
|
message: $comm$ was executed on host.
|
|
mitre_attack_id:
|
|
- T1082
|
|
- T1014
|
|
observable:
|
|
- name: comm
|
|
type: Other
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- comm
|
|
- exe
|
|
- SYSCALL
|
|
- UID
|
|
- ppid
|
|
- pid
|
|
risk_score: 15
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1082/linux_auditd_lsmod/linux_auditd_lsmod.log
|
|
source: /var/log/audit/audit.log
|
|
sourcetype: linux:audit
|
|
update_timestamp: true
|