Abusable DLL Potential Sideloading From Suspicious Location — Sigma Rule

Rule metadata and linked tags

Author: X__Junior (Nextron Systems). Source status: test; severity: high. Source dates: 2023-07-11 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 903acc81c3f4caa74ca8286969dce62e3313aa195b8f7584c73ec3f8b89f95b0

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: Abusable DLL Potential Sideloading From Suspicious Location
id: 799a5f48-0ac1-4e0f-9152-71d137d48c2a
status: test
description: Detects potential DLL sideloading of DLLs that are known to be abused from suspicious locations
references:
    - https://www.trendmicro.com/en_us/research/23/f/behind-the-scenes-unveiling-the-hidden-workings-of-earth-preta.html
    - https://research.checkpoint.com/2023/beyond-the-horizon-traveling-the-world-on-camaro-dragons-usb-flash-drives/
author: X__Junior (Nextron Systems)
date: 2023-07-11
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: image_load
    product: windows
detection:
    selection_dll:
        ImageLoaded|endswith:
            # Note: Add more generic DLLs that cannot be pin-pointed to a single application
            - '\coreclr.dll'
            - '\facesdk.dll'
            - '\HPCustPartUI.dll'
            - '\libcef.dll'
            - '\ZIPDLL.dll'
    selection_folders_1:
        ImageLoaded|contains:
            - ':\Perflogs\'
            - ':\Users\Public\'
            - '\Temporary Internet'
            - '\Windows\Temp\'
    selection_folders_2:
        - ImageLoaded|contains|all:
              - ':\Users\'
              - '\Favorites\'
        - ImageLoaded|contains|all:
              - ':\Users\'
              - '\Favourites\'
        - ImageLoaded|contains|all:
              - ':\Users\'
              - '\Contacts\'
        - ImageLoaded|contains|all:
              - ':\Users\'
              - '\Pictures\'
    condition: selection_dll and 1 of selection_folders_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.trendmicro.com/en_us/research/23/f/behind-the-scenes-unveiling-the-hidden-workings-of-earth-preta.html
• https://research.checkpoint.com/2023/beyond-the-horizon-traveling-the-world-on-camaro-dragons-usb-flash-drives/