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Analyzing a Full ClickFix Attack Chain - Part 1

· Published 23/04/2026 14:31 · Modified 27/04/2026 14:37

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Essential information

Published
23/04/2026 14:31
Modified
27/04/2026 14:37
Tags
2026-04-23 clickfix dropper fake captcha fileless execution persistence mechanism phishing powershell social engineering
Related entities
3 observables, 4 others

Description

A sophisticated campaign was detected in mid-March 2026, beginning with a malicious webpage impersonating Booking.com's visual identity with a . The attack leverages to trick victims into executing a command that downloads and runs a script directly in memory. The JavaScript code automatically copies malicious commands to the clipboard and intercepts copy events. Once executed, the performs system fingerprinting, downloads a ZIP payload from a remote server, deploys it to user directories, establishes persistence through registry keys and scheduled tasks, and executes the final payload. The campaign demonstrates well-structured code with fallback mechanisms and real-time telemetry via Telegram, suggesting the use of a ready-to-use attack kit.

External references