Detection rules › Sigma
Potential Rcdll.DLL Sideloading
Detects potential DLL sideloading of rcdll.dll
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
title: Potential Rcdll.DLL Sideloading
id: 6e78b74f-c762-4800-82ad-f66787f10c8a
status: test
description: Detects potential DLL sideloading of rcdll.dll
references:
- https://www.trendmicro.com/en_us/research/23/c/iron-tiger-sysupdate-adds-linux-targeting.html
author: X__Junior (Nextron Systems)
date: 2023-03-13
modified: 2023-03-15
tags:
- attack.persistence
- attack.privilege-escalation
- attack.execution
- attack.stealth
- attack.t1574.001
logsource:
category: image_load
product: windows
detection:
selection:
ImageLoaded|endswith: '\rcdll.dll'
filter:
ImageLoaded|startswith:
- 'C:\Program Files (x86)\Microsoft Visual Studio\'
- 'C:\Program Files (x86)\Windows Kits\'
condition: selection and not filter
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
selection and not filterStage 1: selection
selection:
ImageLoaded|endswith: '\rcdll.dll'
Stage 2: not filter
filter:
ImageLoaded|startswith:
- 'C:\Program Files (x86)\Microsoft Visual Studio\'
- 'C:\Program Files (x86)\Windows Kits\'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
ImageLoaded | starts_with | C:\Program Files (x86)\Microsoft Visual Studio\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files (x86)\Microsoft Visual Studio\" |
ImageLoaded | starts_with | C:\Program Files (x86)\Windows Kits\ | excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files (x86)\Windows Kits\" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ImageLoaded | ends_with |
| field:"ImageLoaded" kind:ends_with value:"\rcdll.dll" |