TCP Port 9594 – msgsys

About TCP Port 9594

Port 9594 is registered with the Internet Assigned Numbers Authority (IANA) for msgsys. The IANA description reads: ‘Message System’. This port is referenced in 2 IDS rules and exhibits low malware activity in monitored traffic.

IDS Rule References

2 IDS / security rules reference TCP port 9594. 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 (2).

Sample rule descriptions for TCP port 9594:

• ET MALWARE Win32/Recslurp.D C2 Request (no alert)
• ET MALWARE Win32/Recslurp.D C2 Response

Malware Rule References

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

2 of the 2 IDS rules that reference TCP port 9594 are malware related. That describes detection coverage across the whole internet, not anything about your machine or your network.

Families observed (top 1): Win32_Recslurp_D (2).

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).