Potential MsiExec Masquerading — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2019-11-14 / 2023-02-21.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ad392f27a214b730fad78cc75cebb1efcaba6fe5a073bdf99eaa8b28feb3ce93

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential MsiExec Masquerading
id: e22a6eb2-f8a5-44b5-8b44-a2dbd47b1144
status: test
description: Detects the execution of msiexec.exe from an uncommon directory
references:
    - https://twitter.com/200_okay_/status/1194765831911215104
author: Florian Roth (Nextron Systems)
date: 2019-11-14
modified: 2023-02-21
tags:
    - attack.stealth
    - attack.t1036.005
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\msiexec.exe'
        - OriginalFileName: '\msiexec.exe'
    filter:
        Image|startswith:
            - 'C:\Windows\System32\'
            - 'C:\Windows\SysWOW64\'
            - 'C:\Windows\WinSxS\'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/200_okay_/status/1194765831911215104