What is the Fake CAPTCHA Scam?
The fake CAPTCHA scam lures victims through phishing links, malvertising, or compromised websites. Once on the fake page, users are prompted to complete a CAPTCHA to prove they're human. But instead of a legitimate test, this CAPTCHA has a hidden agenda: it injects malicious code onto the user's clipboard.
How the Scam Operates
- The Setup: You’re taken to a phishing or compromised site where a pop-up prompts you to "verify" you’re human with a CAPTCHA.
- The Hidden Script: When you click to start the CAPTCHA, a script containing malicious commands is automatically copied to your clipboard.
- The Instructions: The CAPTCHA then instructs you to open the "Run" window (by pressing
Windows + R), paste the content from your clipboard, and execute it. - The Malware Download: By running this command, you unknowingly initiate the download of malware, compromising your device.
This scam relies heavily on manipulating the user into actively executing the malware. By placing the malicious code onto the clipboard and tricking users into pasting and running it themselves, the attackers effectively bypass traditional security measures.
Why This Scam is Dangerous
- Social Engineering Twist: The fake CAPTCHA scam taps into the user's trust in CAPTCHAs as a common internet security feature.
- High Impact: In just one month, Avast Threat Labs reports having protected over 2.1 million users from this scam.
- Global Reach: Countries like Italy, Argentina, Spain, and the Philippines have been heavily affected, but this scam could target users anywhere.
Protecting Yourself Against CAPTCHA Scams
With scams becoming more sophisticated, here are some tips to keep yourself safe:
- Stay Skeptical: If something feels off, it probably is. Legitimate CAPTCHAs don’t require you to open the Run command or paste anything.
- Verify the Site: Always double-check the URL to ensure you’re on a legitimate website.
- Use Trusted Security Software: Antivirus programs can help block malicious sites before they can trick you into engaging with fake CAPTCHAs.
- Be Cautious of Clipboard Activity: If a website automatically copies something to your clipboard, be on alert—especially if it asks you to paste and run commands.
Conclusion
As threats like the fake CAPTCHA scam emerge, it’s a reminder that staying safe online requires vigilance and a healthy dose of skepticism. Cybercriminals often rely on ignorance, but by staying informed, we can thwart these attempts. So, the next time you’re asked to prove you’re human online, take a moment to consider if it might be a trap. Staying alert and aware is your best defense against these kinds of scams.
