HackTool - CrackMapExec PowerShell Obfuscation

calendar Oct 18, 2023 · attack.execution attack.t1059.001 attack.defense_evasion attack.t1027.005  ·
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The CrachMapExec pentesting framework implements a PowerShell obfuscation with some static strings detected by this rule.

Sigma rule (View on GitHub)

 1title: HackTool - CrackMapExec PowerShell Obfuscation
 2id: 6f8b3439-a203-45dc-a88b-abf57ea15ccf
 3status: test
 4description: The CrachMapExec pentesting framework implements a PowerShell obfuscation with some static strings detected by this rule.
 5references:
 6    - https://github.com/byt3bl33d3r/CrackMapExec
 7    - https://github.com/byt3bl33d3r/CrackMapExec/blob/0a49f75347b625e81ee6aa8c33d3970b5515ea9e/cme/helpers/powershell.py#L242
 8author: Thomas Patzke
 9date: 2020/05/22
10modified: 2023/02/21
11tags:
12    - attack.execution
13    - attack.t1059.001
14    - attack.defense_evasion
15    - attack.t1027.005
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection_img:
21        - Image|endswith:
22              - '\powershell.exe'
23              - '\pwsh.exe'
24        - OriginalFileName:
25              - 'PowerShell.EXE'
26              - 'pwsh.dll'
27    selection_cli:
28        CommandLine|contains:
29            - 'join*split'
30            # Line 343ff
31            - '( $ShellId[1]+$ShellId[13]+''x'')'
32            - '( $PSHome[*]+$PSHOME[*]+'
33            - '( $env:Public[13]+$env:Public[5]+''x'')'
34            - '( $env:ComSpec[4,*,25]-Join'''')'
35            - '[1,3]+''x''-Join'''')'
36    condition: all of selection_*
37fields:
38    - ComputerName
39    - User
40    - CommandLine
41falsepositives:
42    - Unknown
43level: high

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