name: Linux Deletion Of Services
id: b509bbd3-0331-4aaa-8e4a-d2affe100af6
version: 1
date: '2022-04-12'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This analytic is to detect a deletion of services in a linux machine.
  attacker may delete or modify services to impair some security features or act as
  defense evasion in a compromised linux machine. This TTP can be also a good indicator
  of a malware trying to wipe or delete several files in a compromised host as part
  of its destructive payload like what acidrain malware does in linux or router machines.
  This detection can be a good pivot to check what process and user tries to delete
  this type of files which is not so common and need further investigation.
data_source:
- Sysmon Event ID 11
search:
  selection1:
    TargetFilename:
    - /etc/systemd/*
    - /usr/lib/systemd/*
    Filesystem.action: deleted
  selection2:
    TargetFilename: '*.service'
  condition: selection1 and selection2
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. If you are using Sysmon, you can use the Add-on for Linux Sysmon from
  Splunkbase.
known_false_positives: Administrator or network operator can execute this command.
  Please update the filter macros to remove false positives.
references:
- https://www.sentinelone.com/labs/acidrain-a-modem-wiper-rains-down-on-europe/
tags:
  analytic_story:
  - AcidRain
  asset_type: endpoint
  confidence: 80
  impact: 80
  message: a $process_name$ deleting a services in $dest$
  mitre_attack_id:
  - T1485
  - T1070.004
  - T1070
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 64
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/acidrain/sysmon_linux.log
    source: Syslog:Linux-Sysmon/Operational
    sourcetype: sysmon:linux