TCP Port 818
About TCP Port 818
Port 818 sits outside of IANA’s formally registered assignments. While most ports below 1024 are assigned to canonical services, this specific port has no current IANA registration. 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 818. 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 818:
- 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 818 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).