name: Linux Service Restarted
id: 084275ba-61b8-11ec-8d64-acde48001122
version: 1
date: '2021-12-20'
author: Teoderick Contreras, Splunk
status: production
type: Anomaly
description: This analytic looks for restarted or re-enable services in linux platform.
  This technique can be executed or performed using systemctl or service tool application.
  Adversaries may create or modify Windows services to repeatedly execute malicious
  payloads as part of persistence. When Windows boots up, it starts programs or applications
  called services that perform background system functions. Administrator may also
  create a legitimated service for a specific tool or normal application as part of
  task or automation, in this scenario it is suggested to look for the service path
  of the actual script or executable that register as service and who created the
  service for further verification.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine:
    - '*systemctl *'
    - '*service *'
  selection2:
    Image|endswith:
    - systemctl
    - service
  selection3:
    CommandLine:
    - '*restart*'
    - '*reload*'
    - '*reenable*'
  condition: (selection1 or selection2) and selection3
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and commandline executions from your
  endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
  Splunkbase.
known_false_positives: Administrator or network operator can use this commandline
  for automation purposes. Please update the filter macros to remove false positives.
references:
- https://attack.mitre.org/techniques/T1543/003/
tags:
  analytic_story:
  - Linux Privilege Escalation
  - Linux Persistence Techniques
  - Linux Living Off The Land
  asset_type: Endpoint
  confidence: 50
  impact: 50
  message: A commandline $process$ that may create or start a service on $dest$
  mitre_attack_id:
  - T1053.006
  - T1053
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 25
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.006/service_systemd/sysmon_linux.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon:linux