Security News > 2020 > May > Surge in phishing attacks using legitimate reCAPTCHA walls

Cyber scammers are starting to use legitimate reCAPTCHA walls to disguise malicious content from email security systems, Barracuda Networks has observed.

The reCAPTCHA walls prevent email security systems from blocking phishing attacks and make the phishing site more believable in the eyes of the user.

ReCAPTCHA walls are typically used to verify human users before allowing access to web content, thus sophisticated scammers are starting to use the Google-owned service to prevent automated URL analysis systems from accessing the actual content of phishing pages.

Researchers observed that one email credential phishing campaign had sent out more than 128,000 emails to various organizations and employees using reCAPTCHA walls to conceal fake Microsoft login pages.

"Furthermore, whilst reCAPTCHA based scams make it harder for automated URL analysis to be conducted, sophisticated email security solutions can still detect these phishing attacks using AI-based email protection solutions. Ultimately no security solution will catch everything, and the ability of the users to spot suspicious emails and websites is key."

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