A macOS ClickFix operation spanning more than 250 front-end domains now fingerprints visitors before deciding whether to show them a malware lure, a change Microsoft Threat Intelligence tracked on infrastructure it had been watching for weeks.

The server-side gate hides the malicious page from crawlers and sandboxes while presenting selected Mac users with a fake software download. Microsoft said the wider cluster distributed MacSync and Atomic Stealer (AMOS); the chain it analyzed through the gate ended in AMOS.

The attack still requires the user to copy and run an obfuscated command in Terminal. That command retrieves scripts and launches an infostealer targeting credentials, browser data, authentication stores, cryptocurrency wallets, and sensitive files. Microsoft has not disclosed victim numbers, targeted sectors, or the identity of the operators.

A new macOS information-stealing malware dubbed ClickLock terminates all visible processes to force users into entering their system login password.

The malware is designed to steal cryptocurrency assets, login credentials, password-manager data, browser information, and macOS authentication data, and it can also install a persistent backdoor for ongoing remote access to infected systems.

Researchers at Group-IB analyzed the ClickLock shell script after discovering the malware on VirusTotal, where it was first submitted on June 9. At the time of the report, it remained undetected by all security vendors available on the platform.