Detection rules › Sigma
Path To Screensaver Binary Modified
Detects value modification of registry key containing path to binary used as screensaver.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1546.002 Event Triggered Execution: Screensaver |
| Privilege Escalation | T1546.002 Event Triggered Execution: Screensaver |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 12 | RegistryEvent (Object create and delete) |
| Sysmon | Event ID 13 | RegistryEvent (Value Set) |
| Sysmon | Event ID 14 | RegistryEvent (Key and Value Rename) |
Rule body yaml
title: Path To Screensaver Binary Modified
id: 67a6c006-3fbe-46a7-9074-2ba3b82c3000
status: test
description: Detects value modification of registry key containing path to binary used as screensaver.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.002/T1546.002.md
- https://www.welivesecurity.com/wp-content/uploads/2017/08/eset-gazer.pdf
author: Bartlomiej Czyz @bczyz1, oscd.community
date: 2020-10-11
modified: 2021-11-27
tags:
- attack.persistence
- attack.privilege-escalation
- attack.t1546.002
logsource:
category: registry_event
product: windows
detection:
selection:
TargetObject|endswith: '\Control Panel\Desktop\SCRNSAVE.EXE' # HKEY_CURRENT_USER\Control Panel\Desktop\SCRNSAVE.EXE
filter:
Image|endswith:
- '\rundll32.exe'
- '\explorer.exe'
condition: selection and not filter
falsepositives:
- Legitimate modification of screensaver
level: medium
Stages and Predicates
Stage 0: condition
selection and not filterStage 1: selection
selection:
TargetObject|endswith: '\Control Panel\Desktop\SCRNSAVE.EXE'
Stage 2: not filter
filter:
Image|endswith:
- '\rundll32.exe'
- '\explorer.exe'
Exclusions
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Image | ends_with | \explorer.exe |
Image | ends_with | \rundll32.exe |
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 |
|---|---|---|
TargetObject | ends_with |
|