Insights, news, education and announcements from PolySwarm | MacOS malware

New MacOS.ZuRu Variant Discovered

Jul 22, 2025 3:05:50 PM / by The Hivemind posted in Threat Bulletin, Evolving Threat, Malware Analysis, Cybersecurity Threat, MacOS malware, ZuRu malware, Termius trojan, macOS security, backdoor threat, SSH client attack, Khepri C2, developer security

Verticals Targeted: IT, software development
Regions Targeted: None specified
Related Families: None

Executive Summary

A new variant of the macOS.ZuRu malware, first identified in 2021, was discovered, leveraging a trojanized Termius application to deploy a modified Khepri C2 beacon, targeting developers and IT professionals. This sophisticated backdoor employs advanced techniques to evade detection and establish persistent remote access.

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NimDoor MacOS Malware

Jul 14, 2025 2:34:09 PM / by The Hivemind posted in Threat Bulletin, North Korea, Stealer, Infostealer, Cryptocurrency, social engineering, Stardust Chollima, NimDoor, AppleScript, MacOS malware, Web3, Nim, Zoom phishing

Verticals Targeted: Cryptocurrency
Regions Targeted: Not Specified
Related Families: None

Executive Summary

NimDoor is a sophisticated MacOS malware deployed by North Korea-linked threat actors, likely Stardust Chollima, targeting Web3 and cryptocurrency organizations. Utilizing Nim and C++ binaries, AppleScript, and social engineering via fake Zoom updates, NimDoor employs process injection, WebSocket communications, and signal-based persistence to steal sensitive data.

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