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Cybercriminals are now exploiting fake CAPTCHA verifications to inject malicious code into clipboard data. When users paste the content (e.g., Ctrl+V), they unknowingly execute harmful scripts.
How the Attack Works
- Attackers disguise malware as harmless text (e.g., āIām not a robot ā reCAPTCHA Verification ID: 8253ā).
- The clipboard is hijacked, replacing copied content with malicious commands.
- Pasting executes hidden scripts, leading to malware infections like infostealers.
Source: https://lnkd.in/e4RbtTwM
You Should Know: How to Protect Yourself
1. Disable Automatic Clipboard Execution
- Windows:
Set-ItemProperty -Path "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System" -Name "DisableCMD" -Value 1 -Type DWord
- Linux:
gsettings set org.gnome.desktop.interface clipboard-synchronization false
2. Use Sandboxed Browsers
- Sandboxie (Windows):
winget install SandboxiePlus.SandboxiePlus
- Firejail (Linux):
sudo apt install firejail firejail --private firefox
3. Monitor Clipboard Activity
- Linux (xclip monitoring):
while true; do xclip -o -selection clipboard | grep -q "reCAPTCHA" && notify-send "Malicious CAPTCHA detected!"; sleep 1; done
- Windows (Clipboard Logger Check):
tasklist | findstr /i "clip"
4. Disable JavaScript for Suspicious Sites
- Browser Console (Chrome/Edge):
chrome://settings/content/javascript
- Terminal (Linux):
sudo ufw deny out 443,80 && sudo ufw enable
5. Use Virtual Machines for Sensitive Tasks
- QEMU/KVM (Linux):
sudo apt install qemu-kvm && virt-manager
- Hyper-V (Windows):
Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All
What Undercode Say
Clipboard hijacking is a stealthy but devastating attack. Always:
– Verify copied content before pasting.
– Use isolated environments (sandboxes/VMs).
– Disable unnecessary scripts in browsers.
– Monitor system processes for clipboard-related anomalies.
Expected Output: Secure, malware-free clipboard usage with proactive defenses.
Related Links:
References:
Reported By: Der Bode – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ā
