Potential CCleanerDU.DLL Sideloading — Sigma Rule

Rule metadata and linked tags

Author: X__Junior (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-07-13 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b141eca6e4e19347f147735e786053ef49121025d50513708b2adafc00c74ae0

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 CCleanerDU.DLL Sideloading
id: 1fbc0671-5596-4e17-8682-f020a0b995dc
status: test
description: Detects potential DLL sideloading of "CCleanerDU.dll"
references:
    - https://lab52.io/blog/2344-2/
author: X__Junior (Nextron Systems)
date: 2023-07-13
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith: '\CCleanerDU.dll'
    filter_main_path:
        Image|startswith:
            - 'C:\Program Files\CCleaner\'
            - 'C:\Program Files (x86)\CCleaner\'
        Image|endswith:
            - '\CCleaner.exe'
            - '\CCleaner64.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - False positives could occur from other custom installation paths. Apply additional filters accordingly.
level: medium

Original YAML and metadata in JSON

False positives

• False positives could occur from other custom installation paths. Apply additional filters accordingly.

Source references

• https://lab52.io/blog/2344-2/