New macOS XCSSET Variant Targets Firefox with Clipper and Persistence Module

Cybersecurity researchers have discovered an updated version of a known Apple macOS malware called XCSSET that has been observed in limited attacks. "This new variant of XCSSET brings key changes related to browser targeting, clipboard hijacking, and persistence mechanisms," the Microsoft Threat...

XCSSET evolves again: Analyzing the latest updates to XCSSET’s inventory

Microsoft Threat Intelligence has identified yet another XCSSET variant in the wild that introduces further updates and new modules beyond those detailed in our March 2025 blog post. The XCSSET malware is designed to infect Xcode projects, typically used by software developers, and run while an...

XCSSET evolves again: Analyzing the latest updates to XCSSET’s inventory

Microsoft Threat Intelligence has identified yet another XCSSET variant in the wild that introduces further updates and new modules beyond those detailed in our March 2025 blog post. The XCSSET malware is designed to infect Xcode projects, typically used by software developers, and run while an...