Sunday, June 26, 2022

Discovering CAPTCHA Protected Phishing Campaigns

Executive Summary

Unit 42 researchers have been observing various malicious campaigns abusing either legitimate challenge and response services (such as Google’s reCAPTCHA) or deploying customized fake CAPTCHA-like validation. Recent security blogs on phishing campaigns and cybercriminals using reCAPTCHA and research papers like PhishTime and CrawlPhish show an increasing trend of CAPTCHA-protected phishing pages. Hiding phishing content behind CAPTCHAs prevents security crawlers from detecting…

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