UDP Port 666 – doom

About UDP Port 666

Port 666 is registered with the Internet Assigned Numbers Authority (IANA) for doom. The IANA description reads: ‘doom Id Software’. This port is referenced in 1 IDS rule and exhibits low malware activity in monitored traffic.

IDS Rule References

1 IDS / security rule reference UDP port 666. 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 1): command-and-control (1).

Sample rule descriptions for UDP port 666:

• ET MALWARE Reptile Rootkit Default UDP Magic Packet Trigger

Malware Rule References

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

1 of the 1 IDS rule that reference UDP port 666 are malware related. That describes detection coverage across the whole internet, not anything about your machine or your network.

Families observed (top 1): Reptile_Rootkit (1).

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry, Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range), Snort Community Rules (GPLv2), and MITRE ATT&CK (Apache 2.0).