TCP Port 55555
About TCP Port 55555
Port 55555 is not assigned to any service in the IANA Service Names and Port Numbers Registry. This port falls within the dynamic/private port range, which IANA explicitly does not register; these ports are intended for ephemeral or temporary use. It is referenced in 2048 IDS rules and exhibits moderate malware activity indicators. Ports outside formal IANA assignment are commonly used by malware authors and security tooling.
IDS Rule References
2048 IDS / security rules reference TCP port 55555. Presence in IDS rules does not mean traffic on this port is malicious. These are patterns security tools monitor.
Rule categories (top 6): trojan-activity (730), web-application-activity (476), web-application-attack (344), attempted-recon (270), misc-activity (76), attempted-user (58).
Sample rule descriptions for TCP port 55555:
- SERVER-WEBAPP PCCS mysql database admin tool access
- SERVER-WEBAPP HyperSeek hsx.cgi directory traversal attempt
- SERVER-WEBAPP SWSoft ASPSeek Overflow attempt
- SERVER-WEBAPP Progress webspeed access
- SERVER-WEBAPP yabb directory traversal attempt
Malware Activity
A meaningful share of monitored traffic on this port involves malware indicators.
683 of 2048 IDS rules for TCP port 55555 involve malware activity.
Families observed (top 8): Bancos (20), Fareit (15), Zeus (15), DesertFalcon (11), Symmi (11), Zebrocy (11), Chopper (10), Locky (9), and 262 more families.
Data Sources
This information is compiled from: Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range), Snort Community Rules (GPLv2), and MITRE ATT&CK (Apache 2.0).