CloudZ Malware Exploits Microsoft Phone Link to Steal SMS and OTPs
In May 2026, cybersecurity researchers identified a new variant of the CloudZ remote access tool (RAT) that employs a malicious plugin named Pheno to exploit Microsoft's Phone Link application. This malware monitors active Phone Link sessions on Windows 10 and 11 systems, accessing the application's local SQLite database to intercept SMS messages and one-time passwords (OTPs) without compromising the associated mobile device. The attack chain begins with a fake ScreenConnect update, leading to the deployment of a Rust-based loader, followed by a .NET loader that installs CloudZ RAT and establishes persistence via a scheduled task. The .NET loader includes anti-analysis checks to evade detection. ([bleepingcomputer.com](https://www.bleepingcomputer.com/news/security/cloudz-malware-abuses-microsoft-phone-link-to-steal-sms-and-otps/?utm_source=openai)) This incident underscores the evolving tactics of threat actors who are increasingly targeting desktop applications that bridge connections to mobile devices. By compromising the Phone Link application, attackers can bypass traditional mobile security measures and directly access sensitive authentication codes, highlighting the need for enhanced security protocols in cross-device applications. ([csoonline.com](https://www.csoonline.com/article/4167092/stealthy-malware-abuses-microsoft-phone-link-to-siphon-sms-otps-from-enterprise-pcs.html?utm_source=openai))
Kill Chain
