
title: Path To Screensaver Binary Modified
author: Bartlomiej Czyz @bczyz1, oscd.community
date: 2020/10/11
description: Detects value modification of registry key containing path to binary
  used as screensaver.
detection:
  SELECTION_1:
    EventID: 12
  SELECTION_2:
    EventID: 13
  SELECTION_3:
    EventID: 14
  SELECTION_4:
    TargetObject: '*\Control Panel\Desktop\SCRNSAVE.EXE'
  SELECTION_5:
    Image:
    - '*\rundll32.exe'
    - '*\explorer.exe'
  condition: ((SELECTION_1 or SELECTION_2 or SELECTION_3) and SELECTION_4 and  not
    (SELECTION_5))
falsepositives:
- Legitimate modification of screensaver.
id: 67a6c006-3fbe-46a7-9074-2ba3b82c3000
level: medium
logsource:
  category: registry_event
  product: windows
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1546.002/T1546.002.md
- https://www.welivesecurity.com/wp-content/uploads/2017/08/eset-gazer.pdf
status: experimental
tags:
- attack.persistence
- attack.privilege_escalation
- attack.t1546.002
ruletype: SIGMA
