Infinity Stealer Malware – Targeting macOS via Nuitka

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Cybersecurity experts have identified a novel information-theft malware called Infinity Stealer that specifically targets Apple macOS devices through a Python-based payload wrapped as an executable using the open-source Nuitka compilation tool.

The malicious campaign employs ClickFix tactics, displaying a counterfeit CAPTCHA interface that imitates Cloudflare's verification system to deceive victims into running harmful commands on their machines.

According to security analysts at Malwarebytes, this represents the inaugural recorded instance of a macOS-focused operation that merges ClickFix distribution methods with a Python-constructed information stealer built through Nuitka compilation.

The use of Nuitka creates significant detection challenges since it transforms Python scripts into C programming language before generating a native executable file, substantially increasing resistance against static code examination.

Unlike PyInstaller's approach of packaging Python interpreters alongside bytecode, Nuitka's methodology proves more elusive by creating authentic native binaries without visible bytecode components, dramatically complicating reverse engineering efforts.

"This malicious software is developed in Python and processed through Nuitka compilation, resulting in a native macOS application file. This construction methodology significantly increases difficulty for both analysis and detection compared to conventional Python-based threats," Malwarebytes researchers explain.

The infection sequence initiates when users encounter a ClickFix deception hosted on the domain update-check[.]com, which masquerades as Cloudflare's human verification protocol and instructs targets to complete authentication by executing a base64-encoded curl command through the macOS Terminal application, effectively circumventing operating system security mechanisms.The script initiates by decoding a Bash command that places a secondary payload, known as the Nuitka loader, into the temporary directory. It then clears the quarantine attribute to ensure smooth execution and launches the loader using 'nohup' to run it in the background. To facilitate communication with its command-and-control server, the script sets environment variables with the C2 address and authentication token before finally removing itself from the system and closing the terminal session.

The Nuitka loader itself is an 8.6 MB Mach-O binary, which encapsulates a substantial 35 MB Zstandard-compressed archive. Inside this archive resides the third-stage payload, identified as 'updatehelper.bin,' which is the core component of the Infinity Stealer malware.Before executing its core data theft functions,

the malware first conducts checks to evade detection,

assessing if it's operating within a virtual or sandboxed setting.

Analysis reveals the payload, built with Python 3.11,

can capture screenshots and extract a range of sensitive information:

Credentials stored in Chromium‑based browsers and Firefox,

entries from the macOS keychain,

cryptocurrency wallet data,

and plaintext secrets from developer files like .env.

All harvested information is transmitted via HTTP POST commands

to a command‑and‑control server,

and the attackers receive a Telegram alert once the theft is complete.

This stealer’s emergence highlights a growing trend:

threats targeting macOS are becoming more sophisticated and deliberate.

A key piece of advice for users remains:

avoid pasting unfamiliar terminal commands found online,

as they may conceal harmful intent.

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