Detection rules › Sigma
CLR DLL Loaded Via Office Applications
Detects CLR DLL being loaded by an Office Product
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
title: CLR DLL Loaded Via Office Applications
id: d13c43f0-f66b-4279-8b2c-5912077c1780
status: test
description: Detects CLR DLL being loaded by an Office Product
references:
- https://medium.com/threatpunter/detecting-adversary-tradecraft-with-image-load-event-logging-and-eql-8de93338c16
author: Antonlovesdnb
date: 2020-02-19
modified: 2023-03-29
tags:
- attack.execution
- attack.t1204.002
logsource:
category: image_load
product: windows
detection:
selection:
Image|endswith:
- '\excel.exe'
- '\mspub.exe'
- '\outlook.exe'
- '\onenote.exe'
- '\onenoteim.exe' # Just in case
- '\powerpnt.exe'
- '\winword.exe'
ImageLoaded|contains: '\clr.dll'
condition: selection
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
Image|endswith:
- '\excel.exe'
- '\mspub.exe'
- '\outlook.exe'
- '\onenote.exe'
- '\onenoteim.exe'
- '\powerpnt.exe'
- '\winword.exe'
ImageLoaded|contains: '\clr.dll'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Image | ends_with |
| field:"Image" kind:ends_with |
ImageLoaded | match |
| field:"ImageLoaded" kind:match value:"\clr.dll" |