Suspicious Get-Variable.exe Creation

calendar Oct 17, 2023 · attack.persistence attack.t1546 attack.defense_evasion attack.t1027  ·
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Get-Variable is a valid PowerShell cmdlet WindowsApps is by default in the path where PowerShell is executed. So when the Get-Variable command is issued on PowerShell execution, the system first looks for the Get-Variable executable in the path and executes the malicious binary instead of looking for the PowerShell cmdlet.

Sigma rule (View on GitHub)

 1title: Suspicious Get-Variable.exe Creation
 2id: 0c3fac91-5627-46e8-a6a8-a0d7b9b8ae1b
 3status: test
 4description: |
 5    Get-Variable is a valid PowerShell cmdlet
 6    WindowsApps is by default in the path where PowerShell is executed.
 7    So when the Get-Variable command is issued on PowerShell execution, the system first looks for the Get-Variable executable in the path and executes the malicious binary instead of looking for the PowerShell cmdlet.    
 8references:
 9    - https://blog.malwarebytes.com/threat-intelligence/2022/04/colibri-loader-combines-task-scheduler-and-powershell-in-clever-persistence-technique/
10    - https://www.joesandbox.com/analysis/465533/0/html
11author: frack113
12date: 2022/04/23
13tags:
14    - attack.persistence
15    - attack.t1546
16    - attack.defense_evasion
17    - attack.t1027
18logsource:
19    product: windows
20    category: file_event
21detection:
22    selection:
23        TargetFilename|endswith: 'Local\Microsoft\WindowsApps\Get-Variable.exe'
24    condition: selection
25falsepositives:
26    - Unknown
27level: high

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