LITS has been notified of a recent rise in fake CAPTCHAs being used to launch phishing attacks and trick users into executing malicious code on their computers.
If you arrive on a website that asks you to do something unusual for a CAPTCHA or that causes Powershell or the Terminal to open, don't follow the instructions! Instead, report it as phishing.
You can read up on this type of scam here, from a trusted resource at Malwarebytes.com.
Example of Fake Captcha screen.