Trojan Malware Surge and Outdated Software Threaten Mac Security

Recent reports from Jamf indicate a dramatic rise in trojan malware, which now accounts for over 50% of all malware detections on Macs, with Atomic Stealer being the most prevalent variant. The malware's dominance increased from 16.61% in 2024 to 50.32% in 2025, with Atomic Stealer responsible for 77.08% of trojan activity. Additionally, over half of organizations are running outdated macOS and mobile operating systems, with 58% of Macs having outdated software. This situation is exacerbated by the fact that 95% of assessed mobile apps contain at least one medium-severity vulnerability. The increase in Mac shipments has coincided with a rise in malware samples, with 73% of Macs now having at least one vulnerable app. Attack methods are evolving, with zero-click and browser-based exploits becoming more common. Keeping software updated is critical to mitigating these vulnerabilities.

Key Points: • Trojan malware now constitutes over 50% of all detections on Macs, with Atomic Stealer leading. • 58% of organizations are using outdated macOS devices, increasing security risks. • 95% of mobile apps assessed contain at least one medium-severity vulnerability.