TCP Port 3333 – dec-notes

About TCP Port 3333

Port 3333 is registered with the Internet Assigned Numbers Authority (IANA) for dec-notes. The IANA description reads: ‘DEC Notes’. This port appears in 2 IDS rules and does not have notable malware activity indicators in our data.

IDS Rule References

2 IDS / security rules reference TCP port 3333. 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): attempted-user (2).

Sample rule descriptions for TCP port 3333:

• ET EXPLOIT Nanopool Claymore Dual Miner Remote Code Execution Linux
• ET EXPLOIT Nanopool Claymore Dual Miner Remote Code Execution Windows

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).