CloudZ RAT potentially steals OTP messages using Pheno plugin

Cisco Talos uncovered an intrusion active since January 2026 where attackers deployed CloudZ remote access tool and an undocumented plugin called Pheno to steal credentials and one-time passwords. The attack exploits Microsoft Phone Link application by intercepting synchronized mobile data including SMS and OTPs without requiring phone-level infection. CloudZ evades detection through dynamic memory execution and anti-analysis checks. The infection chain begins with a fake ScreenConnect update executable, leading to a Rust-compiled dropper that deploys a .NET loader, ultimately establishing the modular CloudZ RAT. The Pheno plugin monitors Phone Link processes and intercepts SQLite database files containing synchronized phone data. CloudZ employs ConfuserEx obfuscation, multiple configuration layers, and facilitates various commands including browser data exfiltration, shell execution, and plugin management while maintaining persistence through scheduled tasks.