Key Points
What you'll learn in this notification
- Threat operations are implementing sophisticated anti-analysis measures within CAPTCHA pages to evade detection and prevent investigation.
- The malicious pages actively detect security tools and redirect to innocuous destinations when identified, avoiding scrutiny by automated systems.
- CAPTCHA verification creates a false sense of security for users while preventing security teams from examining the hidden credential-harvesting content.
Obfuscation Techniques
Rikesh Vekaria and Mimecast threat researchers have recently identified that threat operators are evolving their phishing tactics by implementing anti-analysis measures within CAPTCHA pages to evade detection and prevent investigation by security professionals. This builds on research from security researchers at Juniper Labs who identified two primary CAPTCHA-based phishing approaches being utilized. The first involves compromising legitimate domains with actual CAPTCHA implementations, while the second involves creating fake CAPTCHA pages that convincingly mimic legitimate Cloudflare turnstile interfaces. Both methods serve as an effective gateway to credential harvesting pages.
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Dimakatso Makinta
