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While plenty of CAPTCHA and reCAPTCHA verification prompts are legitimate, anything that includes instructions—pressing a combination of keys or executing a Run command on your device—certainly is not. Trustworthy CAPTCHAs won't direct you to download software or extensions.
Be wary of CAPTCHA forms from sources and sites you don't know and trust, and never follow directions in these pop-ups without thinking. Attackers are exploiting "verification fatigue," which has users clicking through something as routine as CAPTCHA so quickly that they don't notice red flags. [more]
Re: Watch Out for Fake CAPTCHAs That Spread Malware
Can be tricky and annoying those captcha pictures. What is a 'crosswalk' anyway? .If the edge of a bikes handlebar clip a square do you click it ? Life and death decisions
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