mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
patel-bhavin
76 lines
2.7 KiB
YAML
76 lines
2.7 KiB
YAML
name: Linux Cpulimit Privilege Escalation
|
|
id: d4e40b7e-aad3-4a7d-aac8-550ea5222be5
|
|
version: 1
|
|
date: '2022-08-11'
|
|
author: Gowthamaraj Rajendran, Splunk
|
|
type: Anomaly
|
|
datamodel:
|
|
- Endpoint
|
|
description: cpulimit is a simple program which attempts to limit the cpu usage of a process (expressed in percentage, not in cpu time). This is useful to control batch jobs, when you don't want them to eat too much cpu.
|
|
If sudo right is given to the program for the user, then the user can run system commands as root and possibly get a root shell.
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process="*cpulimit*" AND Processes.process="*-l*" AND Processes.process="*-f*" AND Processes.process="*sudo*" 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_cpulimit_privilege_escalation_filter`'
|
|
how_to_implement: To successfully implement this search, you need to be ingesting
|
|
logs with the process name, parent process, and command-line executions from your
|
|
endpoints into the Endpoint datamodel. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
|
|
Splunkbase.
|
|
known_false_positives: False positives may be present, filter as needed.
|
|
references:
|
|
- https://gtfobins.github.io/gtfobins/cpulimit/
|
|
- http://cpulimit.sourceforge.net/
|
|
tags:
|
|
analytic_story:
|
|
- Linux Privilege Escalation
|
|
- Linux Living Off The Land
|
|
asset_type: Endpoint
|
|
cis20:
|
|
- CIS 3
|
|
- CIS 5
|
|
- CIS 16
|
|
confidence: 50
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Privilege Escalation
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1548/cpulimit/sysmon_linux.log
|
|
impact: 40
|
|
kill_chain_phases:
|
|
- Exploitation
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$
|
|
mitre_attack_id:
|
|
- T1548.003
|
|
- T1548
|
|
nist:
|
|
- DE.CM
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: parent_process_name
|
|
type: Process
|
|
role:
|
|
- Parent Process
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Child Process
|
|
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: 20
|
|
security_domain: endpoint
|
|
|