ICQ

TCP

Messaging Low Risk

ICQ instant messaging — legacy chat protocol

🔍 How to Scan Port 4000

nmap -sV -p 4000 target

nmap -sV -sC --script=banner -p 4000 target

nc -zv target 4000

Scan port 4000 with nmap -sV to identify the exact service and version
If ICQ is not needed, close or firewall this port immediately
Check for default credentials if a management interface runs on this port
Use searchsploit icq to find known exploits
Monitor traffic on port 4000 with Wireshark or tcpdump for anomalies
Ensure the service is patched to the latest version to prevent known CVE exploitation

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