Telegram Phishing Exploit Hijacks Authentication for Full User Session Access

A recent surge in sophisticated phishing campaigns targeting Telegram users has raised significant security concerns. Unlike traditional methods that often clone login pages, this new tactic utilizes Telegram’s legitimate authentication processes to compromise accounts without detection.

How the Phishing Exploit Works

This method allows attackers to hijack user sessions. By closely mimicking Telegram’s official login workflows, they effectively bypass standard security measures. Victims interact with fraudulent interfaces designed to look authentic, both for QR-code scanning and manual phone number entry.

Ephemeral Domains and Deceptive Interfaces

• Fraudulent login pages are hosted on temporary domains.
• The design closely resembles Telegram’s branding.
• Interacting with these pages does not send data to hackers; it instead triggers a legitimate login request initiated by the attacker.

CYFIRMA analysts revealed that this sophisticated approach frames these authorization prompts as routine security checks. By doing so, it significantly boosts the likelihood of user compliance while minimizing any detectable anomalies. Once the user accepts the login request, believing they are confirming their identity, attackers gain immediate access to accounts.

Dynamic Infrastructure and API Abuse

The technical complexity of this exploit showcases attackers’ ability to evade detection effectively. Instead of embedding phishing logic directly into web pages, the malicious site retrieves instructions from a central server using cross-origin API calls. This approach allows rapid rotation of domains while keeping a consistent attack structure.

Misleading System Messages

Phishing pages often display deceptive messages, prompting users to click “Yes” on notifications claiming to verify their accounts. By shifting critical actions to the familiar Telegram app interface, the malicious session binding process appears legitimate.

Prevention Tips for Users

To protect against these phishing attempts, users should follow these precautions:

• Never approve login requests unless you initiated them.
• Avoid scanning QR codes from unknown platforms.
• Regularly review active sessions in Telegram’s “Devices” settings.
• Enable Two-Step Verification to provide an additional layer of security.

This extra layer requires a secondary password, which can help prevent unauthorized access, even if a user mistakenly approves an initial prompt. Staying vigilant and informed is essential in combating these advanced phishing scams targeting Telegram users.

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