TCP Port 2323 – 3d-nfsd

About TCP Port 2323

The Internet Assigned Numbers Authority (IANA) registers port 2323 for 3d-nfsd. The IANA description reads: ‘3d-nfsd’. This port is referenced in 30 IDS rules and exhibits high malware activity in monitored traffic.

IDS Rule References

30 IDS / security rules reference TCP port 2323. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.

Rule categories (top 2): attempted-admin (29), trojan-activity (1).

Sample rule descriptions for TCP port 2323:

• ET TELNET busybox MIRAI hackers – Possible Brute Force Attack
• ET TELNET busybox ECCHI hackers – Possible Brute Force Attack
• ET MALWARE Linux.Mirai Login Attempt (xc3511)
• ET MALWARE Possible Linux.Mirai Login Attempt (1111111)
• ET MALWARE Possible Linux.Mirai Login Attempt (54321)

Malware Rule References

A large share of the IDS rules that reference this port are malware related.

27 of the 30 IDS rules that reference TCP port 2323 are malware related. That describes detection coverage across the whole internet, not anything about your machine or your network.

Families observed (top 1): Mirai (26).

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).