bot management – Research – Castle
bot management
Fingerprint harvesting in the bot ecosystem
Published April 22, 2026
Antoine Vastel
This report uncovers how bot ecosystems harvest and reuse real browser fingerprints, including signals from commercial anti-bot systems, to scale realistic impersonation. These fingerprints are becoming operational assets, enabling more efficient and harder-to-detect automation. The implication is clear: detection systems must assume replay and treat client-side signals as untrusted.
BotmasterLabs: Powering an Era of Spam
Published March 23, 2026
Antoine Vastel, Nicolas Sama, Naif Mehanna, Kurt Nistelberger
How XRumer and XEvil scaled forum spam by combining automation, CAPTCHA solving, and brittle fingerprinting.