The attack method is designed to appear as a legitimate interaction. Victims are contacted via Telegram, where the attacker impersonates a known associate or business contact. They are then sent a meeting invite using Calendly, a widely-used scheduling platform. The Calendly message includes a link that falsely claims to be a “Zoom SDK update script.” Instead, this link downloads malware specifically designed to infiltrate macOS systems.
The malware uses a combination of AppleScript, C++, and the Nim programming language to evade detection. This mix is relatively novel, especially the use of Nim in macOS attacks. Once installed, the malware gathers a broad range of data from the infected device. This includes system information, browser activity, and chat logs from Telegram. It also attempts to extract login credentials, macOS Keychain passwords, and data stored in browsers like Arc, Brave, Firefox, Chrome, and Microsoft Edge. Interestingly, Safari does not appear to be among the targeted applications.
While the campaign focuses primarily on a niche audience—Mac users engaged in crypto-related work who use Calendly and Telegram—SentinelLabs warns that the tactics employed could signal broader threats on the horizon. The use of obscure programming combinations to bypass security measures is a red flag for potential future campaigns targeting a wider user base.
To safeguard against such malware, users are advised to avoid downloading software from public code repositories or unofficial websites. While the Mac App Store is considered the safest source for macOS applications, software downloaded directly from reputable developers’ websites is generally secure. Users who rely on pirated or cracked applications remain at significantly higher risk of infection.
Cyber hygiene remains essential. Never click on suspicious links received via email, text, or social platforms, especially from unknown or unverified sources. Always verify URLs by copying and pasting them into a text editor to see their true destination before visiting. It’s also crucial to install macOS security updates promptly, as these patches address known vulnerabilities.
For additional protection, consider using trusted antivirus software. Guides from Macworld suggest that while macOS has built-in security, third-party tools like Intego can offer enhanced protection. As malware campaigns evolve in complexity and scope, staying vigilant is the best defense.
