Listen to this Post
Introduction:
A recent investigation by Hunt Intelligence uncovered a large-scale SEO poisoning campaign exploiting over 630,000 Brazilian government (gov.br) subdomains. Attackers used hijacked infrastructure, cloaking, and templated content to redirect users to scam and betting sites while deceiving search engines with fake government pages. This sophisticated attack highlights the growing threat of SEO poisoning in cybercrime.
Learning Objectives:
- Understand how SEO poisoning attacks manipulate search rankings.
- Learn how attackers abuse subdomains for malicious redirection.
- Discover tools and techniques to detect and mitigate such threats.
You Should Know:
1. How Attackers Abuse Subdomains for SEO Poisoning
Attackers exploited .gov.br subdomains by injecting malicious JavaScript redirects. Below is a sample of the redirection script:
// Malicious redirect script
if (document.referrer.indexOf("google.com") > -1) {
window.location.href = "https://scam-site.com";
} else {
// Show fake government page
document.write("
<h1>Official Gov Portal</h1>
");
}
How It Works:
- Search engines index the fake government page.
- Real users are redirected to malicious sites.
- Attackers profit from ad fraud or scams.
2. Detecting Cloaking with cURL
Cloaking hides malicious content from search engines. Use cURL to check for discrepancies:
curl -A "Googlebot" https://target.gov.br/subpage curl -A "Mozilla/5.0" https://target.gov.br/subpage
Analysis:
- If responses differ, cloaking is likely in use.
- Googlebot sees a benign page, while users get redirected.
3. Identifying Malicious Subdomains with Dig
Check DNS records for suspicious subdomains:
dig +short A random123.gov.br
What to Look For:
- Unusual IP addresses (e.g., non-government hosting).
- Multiple subdomains pointing to the same IP.
4. Analyzing Traffic with Wireshark
Capture HTTP traffic to detect redirections:
tshark -i eth0 -Y "http.response.code == 301 || http.response.code == 302"
Key Indicators:
- Unexpected 301/302 redirects.
- Traffic going to known scam domains.
5. Mitigating SEO Poisoning via .htaccess
Block malicious bots with Apache rules:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} (bot|scraper|spider) [bash]
RewriteRule ^ - [bash]
Effect:
- Prevents automated indexing of fake pages.
- Legitimate users still access the real site.
6. Automating Detection with Python
Scan for compromised subdomains:
import requests
def check_redirect(url):
res = requests.get(url, headers={"User-Agent": "Googlebot"})
return res.url != url
if check_redirect("https://example.gov.br"):
print("Malicious redirect detected!")
Use Case:
- Batch-check subdomains for redirection attacks.
7. Reporting Abuse to Google
Submit poisoned URLs for removal:
curl -X POST "https://searchconsole.google.com/api/reporting/security-issues"
Why It Matters:
- Helps deindex malicious pages faster.
- Protects users from scams.
What Undercode Say:
- Key Takeaway 1: SEO poisoning is evolving, leveraging trusted domains for credibility.
- Key Takeaway 2: Automated tools like Hunt.io’s AttackCapture are critical for tracing such attacks.
Analysis:
This attack demonstrates how cybercriminals exploit trusted TLDs (.gov, .edu) to bypass security filters. Organizations must monitor subdomains, implement strict access controls, and use real-time traffic analysis to detect anomalies.
Prediction:
As SEO manipulation tools become more accessible, we’ll see more large-scale poisoning campaigns targeting government and financial sectors. Proactive detection and takedown strategies will be essential in mitigating future threats.
IT/Security Reporter URL:
Reported By: Mthomasson 630k – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
