TCP Port 992 – telnets
About TCP Port 992
Port 992 carries the IANA assignment for telnets. The IANA description reads: ‘telnet protocol over TLS/SSL’. This port appears in 31 IDS rules and does not have notable malware activity indicators in our data.
IDS Rule References
31 IDS / security rules reference TCP port 992. 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 2): attempted-recon (26), bad-unknown (5).
Sample rule descriptions for TCP port 992:
- SERVER-OTHER OpenSSL SSLv3 heartbeat read overrun attempt
- SERVER-OTHER OpenSSL TLSv1 heartbeat read overrun attempt
- SERVER-OTHER OpenSSL TLSv1.1 heartbeat read overrun attempt
- SERVER-OTHER OpenSSL TLSv1.2 heartbeat read overrun attempt
- SERVER-OTHER OpenSSL SSLv3 large heartbeat response – possible ssl heartbleed attempt
Data Sources
This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry, Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range), and Snort Community Rules (GPLv2).