TCP Port 9856
About TCP Port 9856
Port 9856 is not assigned to any service in the IANA Service Names and Port Numbers Registry. Ports in this numerical range can be assigned by IANA but this specific port has no current registration. It is referenced in 2 IDS rules and exhibits low malware activity indicators. Ports outside formal IANA assignment are commonly used by malware authors and security tooling.
IDS Rule References
2 IDS / security rules reference TCP port 9856. 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 9856:
- 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 9856 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: Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).