Replace Desktop Wallpaper by Powershell

 1title: Replace Desktop Wallpaper by Powershell
 2id: c5ac6a1e-9407-45f5-a0ce-ca9a0806a287
 3status: test
 4description: |
 5    An adversary may deface systems internal to an organization in an attempt to intimidate or mislead users.
 6    This may take the form of modifications to internal websites, or directly to user systems with the replacement of the desktop wallpaper    
 7references:
 8    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1491.001/T1491.001.md
 9author: frack113
10date: 2021/12/26
11tags:
12    - attack.impact
13    - attack.t1491.001
14logsource:
15    product: windows
16    category: ps_script
17    definition: 'Requirements: Script Block Logging must be enabled'
18detection:
19    selection_1:
20        ScriptBlockText|contains|all:
21            - 'Get-ItemProperty'
22            - 'Registry::'
23            - 'HKEY_CURRENT_USER\Control Panel\Desktop\'
24            - 'WallPaper'
25    selection_2:
26        ScriptBlockText|contains: SystemParametersInfo(20,0,*,3)
27    condition: 1 of selection_*
28falsepositives:
29    - Unknown
30level: low