Detection rules › Sigma
Potential CCleanerReactivator.DLL Sideloading
Detects potential DLL sideloading of "CCleanerReactivator.dll"
Known false positives
- False positives could occur from other custom installation paths. Apply additional filters accordingly.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
title: Potential CCleanerReactivator.DLL Sideloading
id: 3735d5ac-d770-4da0-99ff-156b180bc600
status: test
description: Detects potential DLL sideloading of "CCleanerReactivator.dll"
references:
- https://lab52.io/blog/2344-2/
author: X__Junior
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: '\CCleanerReactivator.dll'
filter_main_path:
Image|startswith:
- 'C:\Program Files\CCleaner\'
- 'C:\Program Files (x86)\CCleaner\'
Image|endswith: '\CCleanerReactivator.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
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_main_*Stage 1: selection
selection:
ImageLoaded|endswith: '\CCleanerReactivator.dll'
Stage 2: not filter_main_path
filter_main_path:
Image|startswith:
- 'C:\Program Files\CCleaner\'
- 'C:\Program Files (x86)\CCleaner\'
Image|endswith: '\CCleanerReactivator.exe'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
Image | starts_with | C:\Program Files (x86)\CCleaner\ | excludes:Image field:"Image" value:"C:\Program Files (x86)\CCleaner\" |
Image | starts_with | C:\Program Files\CCleaner\ | excludes:Image field:"Image" value:"C:\Program Files\CCleaner\" |
Image | ends_with | \CCleanerReactivator.exe | excludes:Image field:"Image" value:"\CCleanerReactivator.exe" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ImageLoaded | ends_with |
| field:"ImageLoaded" kind:ends_with value:"\CCleanerReactivator.dll" |