ClickFix Browser Attacks: How Fake Captchas Deliver Malware Without Downloads

The ClickFix Browser Threat

• 💡 The "ClickFix" threat, also known as CAPTCHAgeddon, is a browser-based attack that tricks users into executing malicious code without requiring any downloads.
• 🎯 Attackers leverage the common user behavior of solving CAPTCHAs to lure victims into pasting and executing PowerShell or shell commands.
• 🔑 This attack bypasses traditional download-based malware detection by exploiting user trust in familiar CAPTCHA interfaces.

Evolution of Attack Vectors

• 🚀 Initially, ClickFix attacks were propagated through malvertising on websites in the gray area, like streaming or download sites.
• 📈 Later, attackers shifted to compromising legitimate, high-traffic websites, particularly WordPress sites, to inject their malicious scripts.
• 🌐 This evolution allowed attackers to leverage the trust associated with well-known websites and even brand fake CAPTCHAs with the compromised site's logo.

Social Engineering and Trust

• 💬 CAPTCHAs are a familiar and often ignored nuisance, making users less defensive when encountering them.
• 🎭 Attackers exploit this by presenting fake CAPTCHAs that, when