Detection rules › Sigma
Rundll32 InstallScreenSaver Execution
An attacker may execute an application as a SCR File using rundll32.exe desk.cpl,InstallScreenSaver
Known false positives
- Legitimate installation of a new screensaver
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
title: Rundll32 InstallScreenSaver Execution
id: 15bd98ea-55f4-4d37-b09a-e7caa0fa2221
status: test
description: An attacker may execute an application as a SCR File using rundll32.exe desk.cpl,InstallScreenSaver
references:
- https://lolbas-project.github.io/lolbas/Libraries/Desk/
- https://github.com/redcanaryco/atomic-red-team/blob/0f229c0e42bfe7ca736a14023836d65baa941ed2/atomics/T1218.011/T1218.011.md#atomic-test-13---rundll32-with-deskcpl
author: 'Christopher Peacock @securepeacock, SCYTHE @scythe_io, TactiKoolSec'
date: 2022-04-28
modified: 2023-02-09
tags:
- attack.stealth
- attack.t1218.011
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\rundll32.exe'
- OriginalFileName: 'RUNDLL32.EXE'
selection_cli:
CommandLine|contains: 'InstallScreenSaver'
condition: all of selection_*
falsepositives:
- Legitimate installation of a new screensaver
level: medium
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\rundll32.exe'
- OriginalFileName: 'RUNDLL32.EXE'
Stage 2: selection_cli
selection_cli:
CommandLine|contains: 'InstallScreenSaver'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match value:"InstallScreenSaver" |
Image | ends_with |
| field:"Image" kind:ends_with value:"\rundll32.exe" |
OriginalFileName | eq |
| field:"OriginalFileName" kind:eq value:"RUNDLL32.EXE" |