Detectionmediumtest
ScreenSaver Registry Key Set
Detects registry key established after masqueraded .scr file execution using Rundll32 through desk.cpl
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Jose Luis Sanchez MartinezCreated Wed May 04Updated Thu Aug 1740b6e656-4e11-4c0c-8772-c1cc6dae34cewindows
Log Source
WindowsRegistry Set
ProductWindows← raw: windows
CategoryRegistry Set← raw: registry_set
Detection Logic
Detection Logic3 selectors
detection:
selection:
Image|endswith: '\rundll32.exe'
registry:
TargetObject|contains: '\Control Panel\Desktop\SCRNSAVE.EXE'
Details|endswith: '.scr'
filter:
Details|contains:
- 'C:\Windows\System32\'
- 'C:\Windows\SysWOW64\'
condition: selection and registry and not filterFalse Positives
Legitimate use of screen saver
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
40b6e656-4e11-4c0c-8772-c1cc6dae34ce
Status
test
Level
medium
Type
Detection
Created
Wed May 04
Modified
Thu Aug 17
Path
rules/windows/registry/registry_set/registry_set_scr_file_executed_by_rundll32.yml
Raw Tags
attack.defense-evasionattack.t1218.011