🔹 Fake Zoom meeting invites and update links deceive Web3 teams

🔹 New NimDoor malware infiltrates macOS with advanced evasion techniques

🔹 Attackers steal browser data, passwords, and Telegram chats

Web3 and Crypto Companies Under Siege by NimDoor Malware

Security experts at SentinelLabs have uncovered a sophisticated malware campaign targeting Web3 startups and cryptocurrency firms. The attacks, linked to North Korean groups, use a combination of social engineering and technical stealth to deploy NimDoor malware, written in the rarely used Nim programming language to bypass antivirus detection.

The Setup: Fake Zoom Meetings Through Telegram

Hackers initiate contact via Telegram, posing as known contacts. They invite victims to schedule meetings via Calendly, then send them links to what appear to be Zoom software updates. These links lead to fake domains like support.us05web-zoom.cloud, mimicking Zoom's legitimate URLs and hosting malicious installation files.

These files contain thousands of lines of whitespace, making them appear "legitimately large." Hidden within are only three crucial lines of code, which download and execute the real attack payload.

NimDoor Malware: Spyware Specifically Targeting macOS

Once executed, the NimDoor malware operates in two main phases:

🔹 Data extraction – stealing saved passwords, browsing histories, and login credentials from popular browsers like Chrome, Firefox, Brave, Edge, and Arc.

🔹 System persistence – maintaining long-term access through stealth background processes and disguised system files.

A key component specifically targets Telegram, stealing encrypted chat databases and decryption keys, giving attackers access to private conversations offline.

Built to Survive: Evasion and Reinstallation Techniques

NimDoor employs a range of advanced persistence mechanisms:

🔹 Automatically reinstalls itself if users try to terminate or delete it

🔹 Creates hidden files and folders that look like legitimate macOS system components

🔹 Connects to the attacker’s server every 30 seconds for instructions, disguised as normal internet traffic

🔹 Delays execution for 10 minutes to avoid early detection by security software

Difficult to Remove Without Professional Tools

Because of these techniques, NimDoor is extremely hard to remove with standard tools. Specialized security software or professional intervention is often required to clean infected systems completely.

Conclusion: Modern Cyberattacks Now Look Like Calendar Invites

Attacks like NimDoor prove how cleverly North Korean groups mimic daily workflows to penetrate even cautious targets. Fake Zoom links and innocent-looking updates can lead to full system compromise.

Users should never download updates from unofficial sources, always verify domain names, and stay vigilant against unexpected software prompts or invitations.


#CyberSecurity , #NorthKoreaHackers , #Web3Security , #CryptoNews , #Hack

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