The recipients should also ask the sender if they sent the faxed document from home or office because “if working from home, odds are that they did not fax it.” Attackers exploit Google reCAPTCHA forms to sneak into users' inboxes because automated #emailsecurity scanners cannot solve CAPTCHAs to determine the destination #phishing URLs. ![]() The firm advised users to check the destination URLs before solving captcha puzzles to avoid unknowingly being redirected to phishing sites and falling for phishing attacks.Īdditionally, senders should ask recipients if the attached PDF documents should have been password protected. ![]() ![]() How to defend against phishing URLs bypassing email securityĪvanan presented various techniques to avoid being lured to phishing URLs by malicious emails that bypass email security features. However, the inability of automated email security features to solve the captcha and generate a preview forces users to download the attachment. Similarly, most email services provide attachment previews allowing users to determine the contents of the email. These conditions prevent email security scanners from detecting phishing URLs in attachments. In this case, an automated email security scanner must extract the destination URL from a PDF document and solve the CAPTCHA. The use of a password-protected document in addition to the use of a convincingly spoofed Microsoft OneDrive page adds to the illusion of security. The reCAPTCHA service makes connections to IP addresses that belong to Google and are already in most allow lists.”Īdditionally, the inability of email security tools to solve Google CAPTCHAs prevents them from determining the contents of the email. Google is inherently trusted by most security scanners since you can’t just block Google. “Perhaps the most popular CAPTCHA is Google’s reCAPTCHA. However, since reCAPTCHA forms connect to Google domains, email security tools fail to stop such attacks. ![]() In this case, the attackers used a compromised university website to send phishing emails.īy default, most email services detect and block phishing URLs embedded in emails. The attackers exploit the trust most users have for Google’s reCAPTCHA service, in addition to the phishing emails originating from a legitimate site.
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