ZA: Alot of attacks at port 137 | Wilders Security Forums

Aug 02, 2003 Azure Advanced Threat Protection Network Name Resolution To resolve IP addresses to computer names, Azure ATP sensors look up the IP addresses using the following methods: NTLM over RPC (TCP Port 135) NetBIOS (UDP port 137) RDP (TCP port 3389) - only the first packet of Client hello; Queries the DNS server using reverse DNS lookup of the IP … Definition of TCP/IP port | PCMag See well-known port, port forwarding and opening a port. Source Ports Are the User Sessions The source port is a next-available number assigned by TCP/IP to the user's machine. IP Whois Lookup - Lookup an IP Address - DNS Checker

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Sygate Personal Firewall comes with a default rule set that blocks all udp requests, however if udp requests originates from source port 137 or 138 they are allowed, thus a malicious person could get access to all open udp ports on a target merely by sending all requests from source port 137 or 138. References: [SECUNIA-7930] SG: 138 : tcp,udp UDP 138 - Port Protocol Information and Warning! Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) but unlike TCP on Port 138, UDP Port 138 is connectionless and does not guarantee reliable communication; it’s up to the application that received the message on Port 138 to process any errors and verify correct delivery.

My firewall is showing outgoing connections on port 137 to a variety of external IP addresses (about 15 or so) - none that are familiar. This leads me to believe something rogue running, but I've done virus scan, spybot, adaware, defender, etc. and nothing is showing up.

UDP 138 - Port Protocol Information and Warning! Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) but unlike TCP on Port 138, UDP Port 138 is connectionless and does not guarantee reliable communication; it’s up to the application that received the message on Port 138 to process any errors and verify correct delivery. Instant IP Address Lookup Lookup IP Address Location. If you can find out the IPv4 or IPv6 address of an Internet user, you can get an idea what part of the country or world they're in by using our IP Lookup tool. What to do: Enter the IP address you're curious about in the box below, then click "Get IP …