![]() ![]() 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. The phishing page then prompts the victim to enter their credentials, which end up in the attacker’s database. ![]() After solving the puzzle, the page redirects the user to the actual phishing page resembling a Microsoft login screen. When a victim opens the document, it redirects them to a CAPTCHA page. They send phishing emails with a non-password-protected PDF purporting to be a faxed document. ![]()
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