Obfuscated PowerShell OneLiner Execution

calendar Sep 2, 2024 · 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.
 5author: '@Kostastsale, @TheDFIRReport'
 6references:
 7    - https://thedfirreport.com/2022/05/09/seo-poisoning-a-gootloader-story/
 8    - https://gist.github.com/mgeeky/3b11169ab77a7de354f4111aa2f0df38
 9date: 2022-05-09
10tags:
11    - attack.defense-evasion
12    - attack.execution
13    - attack.t1059.001
14    - attack.t1562.001
15logsource:
16    product: windows
17    category: process_creation
18detection:
19    selection:
20        Image|endswith: '\powershell.exe'
21        CommandLine|contains|all:
22            - 'http://127.0.0.1'
23            - '%{(IRM $_)}'
24            - '.SubString.ToString()[67,72,64]-Join'
25            - 'Import-Module'
26    condition: selection
27falsepositives:
28    - Unknown
29level: high

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