Potential Wazuh Security Platform DLL Sideloading

Hunt Hypothesis

Detects potential DLL side loading of DLLs that are part of the Wazuh security platform

Detection Rule

Sigma (Original)

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

KQL (Microsoft 365 Defender)

DeviceImageLoadEvents
| where (FolderPath endswith "\\libwazuhshared.dll" or FolderPath endswith "\\libwinpthread-1.dll") and (not((FolderPath startswith "C:\\Program Files\\" or FolderPath startswith "C:\\Program Files (x86)\\"))) and (not(((FolderPath contains "\\AppData\\Local\\" or FolderPath contains "\\ProgramData\\") and FolderPath endswith "\\mingw64\\bin\\libwinpthread-1.dll")))

Required Data Sources

False Positive Guidance

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

MITRE ATT&CK Context

• Tactic: Persistence
• Tactic: Privilege Escalation
• Tactic: Execution
• Technique: T1574.001 — T1574.001

References

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