UDP Port 135 – epmap
About UDP Port 135
Port 135 is registered with the Internet Assigned Numbers Authority (IANA) for epmap. The IANA description reads: ‘DCE endpoint resolution’. This port appears in 8 IDS rules and does not have notable malware activity indicators in our data.
IDS Rule References
8 IDS / security rules reference UDP port 135. 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-admin (6), protocol-command-decode (2).
Sample rule descriptions for UDP port 135:
- OS-WINDOWS DCERPC Messenger Service buffer overflow attempt
- OS-WINDOWS DCERPC NCADG-IP-UDP lsass DsRolerUpgradeDownlevelServer overflow attempt
- OS-WINDOWS DCERPC NCADG-IP-UDP ISystemActivator CoGetInstanceFromFile attempt
- OS-WINDOWS DCERPC NCADG-IP-UDP msqueue function 4 overflow attempt
- OS-WINDOWS Messenger message little endian overflow 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).