TCP Port 9951 – apc-9951

About TCP Port 9951

Port 9951 is registered with the Internet Assigned Numbers Authority (IANA) for apc-9951. The IANA description reads: ‘APC 9951’. 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 9951. 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 9951:

• 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 9951 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).