Using Cloudflare Turnstile to Evade Phishing Sandboxes: A Red Team Field Guide
By
Zach Stein
Fresh out the oven, still warm. Top of the tray.
Summary
A red teamer recounts their experience with email phishing engagements and how modern email defenses (sandboxes, scanners) have made traditional phishing difficult. The article explores using Cloudflare Turnstile as a technical solution to conceal phishing pages from automated sandbox analysis, allowing the real phishing content to only be served to human targets. It provides technical implementation details, lessons learned from field testing, and practical advice for red team operations.
Key quotes
· 3 pulledI thought to myself, 'No problem! I have done phishing before relatively successfully.' Instead, I discovered that the landscape drastically changed from the last time I assisted with an assessment.
Phishing can be one of the most rewarding and most frustrating activities we
Sandboxes, scanners, oh my.
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