name: Uninstall App Using MsiExec
id: 1fca2b28-f922-11eb-b2dd-acde48001122
version: 1
date: '2021-08-09'
author: Teoderick Contreras, Splunk
status: production
type: TTP
description: This search is to detect a suspicious un-installation of application
  using msiexec. This technique was seen in conti leak tool and script where it tries
  to uninstall AV product using this commandline. This commandline to uninstall product
  is not a common practice in enterprise network.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    CommandLine: '* /qn *'
    Image|endswith: msiexec.exe
  selection2:
    CommandLine: '*/X*'
  selection3:
    CommandLine: '*REBOOT='
  condition: selection1 and selection2 and selection3
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 must have at least version 6.0.4 of the
  Sysmon TA.
known_false_positives: unknown.
references:
- https://threadreaderapp.com/thread/1423361119926816776.html
tags:
  analytic_story:
  - Ransomware
  asset_type: Endpoint
  confidence: 60
  impact: 50
  message: process $process_name$ with a cmdline $process$ in host $dest$
  mitre_attack_id:
  - T1218.007
  - T1218
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: process_name
    type: Process
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 30
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/conti_leak/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog