This PowerShell command performs the following actions: 1. **Initial Setup**: ...

This PowerShell command performs the following actions:

1. Initial Setup:

   • powershell.exe -ExecutionPolicy AllSigned -NoProfile -NonInteractive -Command: Configures the execution of a PowerShell script with specific options:
     • -ExecutionPolicy AllSigned: Only scripts signed by a trusted publisher are allowed to execute.
     • -NoProfile: Prevents loading PowerShell profile files, ensuring a clean execution environment.
     • -NonInteractive: Suppresses prompts, running the script without user interaction.

2. Configure Output Encoding:

   • $OutputEncoding = [Console]::OutputEncoding = [System.Text.Encoding]::UTF8: Ensures the console output and script provide UTF-8 encoding.

3. Open the Target Script File:

   • C:\ProgramData\Microsoft\Windows Defender Advanced Threat Protection\DataCollection\<file-path>\<file-name>.ps1: The script attempts to open (with read-only access) a PowerShell script located at a specific directory on the filesystem.

4. Calculate File Hash:

   • Microsoft.PowerShell.Utility\Get-FileHash ... -Algorithm SHA256: Computes the SHA256 hash of the specified PowerShell script file (a391f42c-7e1a-4611-8494-1817d2420e09.ps1).

5. Compare Hash Against Expected Value:

   • if (!($calculatedHash.Hash -eq 'ce8965fe4a64873d383b6269ebf182c0d7fbe8eeea42c5a3d50d8886d2c0b56d')) { exit 323; }: The script verifies the computed SHA256 hash of the file against the expected hash value (ce8965fe4a64873d383b6269ebf182c0d7fbe8eeea42c5a3d50d8886d2c0b56d).
     • If the hashes do not match, the command exits with a specific exit code 323.
     • This prevents execution of an altered or unauthorized version of the script.

6. Execute the Target Script:

   • . 'C:\ProgramData\Microsoft\Windows Defender Advanced Threat Protection\DataCollection\<file-path>\<file-name>.ps1': If the hash matches the expected value, it executes the target PowerShell script file (a391f42c-7e1a-4611-8494-1817d2420e09.ps1).

Summary:

This command ensures the integrity of a PowerShell script file before executing it. It does so by calculating its SHA256 hash, comparing it to a predefined hash value, and halting execution if a mismatch occurs. If the script passes validation, it is executed in a restricted and non-interactive environment.