35,000+ Websites Hacked in Massive Cyberattack – Users Redirected to Chinese Gambling Sites!
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A massive cybersecurity breach has compromised over 35,000 websites, injecting malicious scripts that hijack users’ browser windows and redirect them to Chinese-language gambling platforms.
The attack, identified on February 20th, 2025, primarily targets regions where Mandarin is common, with the final landing pages promoting gambling content under the “Kaiyun” brand.
How the Attack Works
Security researchers at c/side discovered that attackers inject a simple one-line script tag into affected websites’ source code. This loads additional malicious code from external sources, initiating the browser hijacking process.
Malicious Script Injection
The initial infection begins with an injected script tag referencing malicious domains such as:
- zuizhongjs[.]com
- mlbetjs[.]com
- ptfafajs[.]com
Once loaded, this script generates another script element, fetching additional malicious payloads from domains like:
- deski.fastcloudcdn[.]com
The primary payload is designed to evade detection by employing:
âś” Device detection techniques
âś” Random delays between 500-1000 milliseconds
âś” Obfuscation methods to bypass automated security tools
Browser Hijacking – Full-Page Redirection
One of the most concerning aspects of this attack is the complete takeover of the browser window.
Security researchers at c/side noted that the malicious script:
🔹 Injects code that writes a full-screen iframe, completely replacing the original website’s content.
🔹 Redirects users to gambling platforms, making it impossible to return to the intended website.
🔹 Targets specific users based on device type, IP, and region.
For example, affected users may be redirected to:
➡ https://www.zuizhongjs[.]com/go/kaiyun1/ky.html
This technique ensures that the victim remains on the attacker-controlled page, giving hackers full control over the browsing experience.
The Infection Process – How It Works
The attack follows a multi-stage execution process:
1. Initial Script Injection
The attacker adds a JavaScript tag to the HTML source code of a vulnerable website.
2. Device Detection
The script analyzes the victim’s device, checking whether it is:
- Mobile or desktop
- Running iOS or Android
- Using specific browsers
3. Content Modification & Redirects
The malicious script:
âś” Creates a meta viewport tag to make the attack fullscreen
âś” Uses document.write() to inject a hidden div covering the entire page
âś” Loads an iframe that replaces legitimate content
Some versions of this attack also include region-based filtering, displaying different content based on IP address.
For example:
- Users from specific regions may be shown a fake access-blocked message with instructions to contact a support team (which is controlled by the attackers).
- This limits exposure to security researchers and helps attackers avoid detection.
Possible Connections to Megalayer Exploit
Security experts believe this campaign may be linked to the Megalayer exploit, a notorious malware responsible for distributing Chinese-language cyber threats.
How to Protect Your Website from This Attack
Website owners and security teams are advised to take the following precautions:
âś… 1. Audit Your Source Code
Check your website’s source code for unauthorized script tags.
âś… 2. Block Malicious Domains
Use firewall rules to block traffic from known malicious domains, including:
- zuizhongjs[.]com
- mlbetjs[.]com
- deski.fastcloudcdn[.]com
âś… 3. Monitor Unauthorized File Modifications
Regularly scan your website files for suspicious changes or new script injections.
âś… 4. Implement a Strong Content Security Policy (CSP)
A proper CSP setup can prevent unauthorized scripts from running on your website.
âś… 5. Use Website Security Scanners
Tools like:
- PublicWWW
- URLScan
Can help detect malicious injections and other security vulnerabilities.
âś… 6. Keep Software & Plugins Updated
Ensure that your CMS, plugins, and security patches are always up to date.
How Can Technijian Help?
At Technijian, we specialize in cybersecurity solutions to help protect your business from online threats. Our expert security teams can:
🔹 Conduct comprehensive website audits to detect vulnerabilities.
🔹 Implement advanced firewall protections to block malicious domains.
🔹 Monitor and remove malware infections before they cause damage.
🔹 Provide 24/7 cybersecurity support for businesses of all sizes.
If your website has been compromised or you need preventative security measures, Technijian can help.
đź’ˇ Get in touch today and safeguard your website from cyber threats!
FAQs
1. What is the impact of this attack on website owners?
Website owners may lose traffic, reputation, and revenue as their sites are hijacked to redirect users to gambling platforms. This can also lead to blacklisting by search engines.
2. How can I check if my website is affected?
You can use tools like PublicWWW or URLScan to scan your website for malicious script injections. Manually inspecting your source code can also help.
3. Can website visitors get infected from this attack?
While this attack primarily redirects users, some variations could distribute malware or phishing scams, leading to further security risks.
4. Is this attack preventable?
Yes! Regular security audits, strong firewalls, and Content Security Policies (CSPs) can prevent these script injections from compromising your website.
5. What should I do if my site is already hacked?
âś” Immediately remove unauthorized scripts
âś” Restore from a clean backup
âś” Update all website software
âś” Seek professional cybersecurity assistance (Technijian can help!)
6. Why are Chinese gambling websites the target destination?
These websites are likely affiliated with organized cybercriminal groups, using these hijacks to drive traffic and generate revenue through forced redirections.
Final Thoughts
This large-scale cyber attack highlights the growing risks of malicious script injections. Website owners must stay vigilant, monitor for suspicious activity, and implement strong security measures to protect their digital assets.
🚀 Stay secure, stay updated, and take cybersecurity seriously!
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