mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
ljstella
85 lines
3.4 KiB
YAML
85 lines
3.4 KiB
YAML
name: Linux AWK Privilege Escalation
|
|
id: 4510cae0-96a2-4840-9919-91d262db210a
|
|
version: 3
|
|
date: '2024-08-14'
|
|
author: Gowthamaraj Rajendran, Splunk
|
|
status: production
|
|
type: Anomaly
|
|
description: The following analytic detects the use of the AWK command with elevated
|
|
privileges to execute system commands. It leverages Endpoint Detection and Response
|
|
(EDR) telemetry, specifically monitoring processes that include "sudo," "awk," and
|
|
"BEGIN*system" in their command lines. This activity is significant because it indicates
|
|
a potential privilege escalation attempt, where a user could gain root access by
|
|
executing commands as the root user. If confirmed malicious, this could allow an
|
|
attacker to fully compromise the system, execute arbitrary commands, and maintain
|
|
persistent control over the affected endpoint.
|
|
data_source:
|
|
- Sysmon for Linux EventID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process="*sudo*" AND
|
|
Processes.process="*awk*" AND Processes.process="*BEGIN*system*" by Processes.dest
|
|
Processes.user Processes.parent_process_name Processes.process_name Processes.process
|
|
Processes.process_id Processes.parent_process_id Processes.process_guid | `drop_dm_object_name(Processes)`
|
|
| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`| `linux_awk_privilege_escalation_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 GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. 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://www.hacknos.com/awk-privilege-escalation/
|
|
tags:
|
|
analytic_story:
|
|
- Linux Privilege Escalation
|
|
- Linux Living Off The Land
|
|
asset_type: Endpoint
|
|
confidence: 50
|
|
impact: 60
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$
|
|
mitre_attack_id:
|
|
- T1548.003
|
|
- T1548
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: parent_process_name
|
|
type: Process
|
|
role:
|
|
- Attacker
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Attacker
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.parent_process_name
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_id
|
|
- Processes.parent_process_id
|
|
risk_score: 30
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548/awk/sysmon_linux.log
|
|
source: Syslog:Linux-Sysmon/Operational
|
|
sourcetype: sysmon:linux
|
|
update_timestamp: true
|