Potential Wazuh Security Platform DLL Sideloading — Sigma Rule

Rule metadata and linked tags

Author: X__Junior (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-03-13 / 2023-05-12.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 8f3e60b857db7d76e50256ad31309d7b0d5ccdfaa2f631bfac6bd54198c84231

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 Wazuh Security Platform DLL Sideloading
id: db77ce78-7e28-4188-9337-cf30e2b3ba9f
status: test
description: Detects potential DLL side loading of DLLs that are part of the Wazuh security platform
references:
    - https://www.trendmicro.com/en_us/research/23/c/iron-tiger-sysupdate-adds-linux-targeting.html
author: X__Junior (Nextron Systems)
date: 2023-03-13
modified: 2023-05-12
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith:
            - '\libwazuhshared.dll'
            - '\libwinpthread-1.dll'
    filter_main_generic:
        ImageLoaded|startswith:
            - 'C:\Program Files\'
            - 'C:\Program Files (x86)\'
    filter_optional_mingw64:
        # Note: Many third party apps installed in "AppData" or "ProgramData" and leverage "mingw64" make use of "libwinpthread-1.dll"
        # In production its best to make a list of these apps and replace this filter with a specific one.
        ImageLoaded|contains:
            - '\AppData\Local\'
            - '\ProgramData\'
        ImageLoaded|endswith: '\mingw64\bin\libwinpthread-1.dll'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Many legitimate applications leverage this DLL. (Visual Studio, JetBrains, Ruby, Anaconda, GithubDesktop, etc.)
level: medium

Original YAML and metadata in JSON

False positives

• Many legitimate applications leverage this DLL. (Visual Studio, JetBrains, Ruby, Anaconda, GithubDesktop, etc.)

Source references

• https://www.trendmicro.com/en_us/research/23/c/iron-tiger-sysupdate-adds-linux-targeting.html