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 | T1204.002 User Execution: Malicious File |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 7 | Image loaded |
Rule body yaml
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
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
Image | ends_with |
|
ImageLoaded | match |
|