Suspicious Service Binary Directory — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2021-03-09 / 2022-10-09.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 05a5c378f5a33a3e3b4ab69a279482a6e7dd9b37401d8474477ed0dab1d5e52e

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: Suspicious Service Binary Directory
id: 883faa95-175a-4e22-8181-e5761aeb373c
status: test
description: Detects a service binary running in a suspicious directory
references:
    - https://blog.truesec.com/2021/03/07/exchange-zero-day-proxylogon-and-hafnium/
author: Florian Roth (Nextron Systems)
date: 2021-03-09
modified: 2022-10-09
tags:
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|contains:
            - '\Users\Public\'
            - '\$Recycle.bin'
            - '\Users\All Users\'
            - '\Users\Default\'
            - '\Users\Contacts\'
            - '\Users\Searches\'
            - 'C:\Perflogs\'
            - '\config\systemprofile\'
            - '\Windows\Fonts\'
            - '\Windows\IME\'
            - '\Windows\addins\'
        ParentImage|endswith:
            - '\services.exe'
            - '\svchost.exe'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://blog.truesec.com/2021/03/07/exchange-zero-day-proxylogon-and-hafnium/