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Windows 7: How to Identify the PID Making a DNS Query

17 Aug 2011   #1

Windows 7 Professional x64
How to Identify the PID Making a DNS Query

Something on my W7 Pro x64 computer is making hundreds of DNS requests to every day. I want to learn the identity of 'something'.

My computer is definitely not infected, not even by a rootkit, and my wireless network is definitely not hacked. My Hosts file is unchanged from the default.

About eight months ago I did install LogMeIn, but a few days later I uninstalled it. I'm quite sure it uninstalled completely.

A capture application like Wireshark can see and analyze the DNS requests, but it doesn't tell me which PID is making the request. A network monitor like TCPview knows the PID but doesn't tell me what traffic is a DNS request.

I am nobody's idea of a network expert, but I understand this much: The problem with identifying which PID is making a DNS request is difficult because processes don't (usually) make DNS queries directly. They ask the OS resolver for hostname resolution, and the resolver in turn makes the DNS query.

I suppose I could open Wireshark and then end processes one by one until the DNS requests stop (or my computer crashes. ) But isn't there some other way to find out which PID is making the original DNS request?

My System SpecsSystem Spec
17 Aug 2011   #2

Windows 7 Professional x64

I can add some additional information to my original post, courtesy of Wireshark:

1- The DNS queries are definitely coming from my computer.
2- The source port is different every time, but always in the upper range of port numbers (50000 and up). For instance, the source ports are 58620, 62544, 56138, 54596, 52952, 57794, etc. This might be an attempt to prevent me from stopping this activity by setting a firewall rule. I would have to block every port from 50000 and up.

I still haven't identified the process that's doing this, nor can I understand why something or someone would be making literally thousands of DNS queries a day for and
My System SpecsSystem Spec
19 Aug 2011   #3

Windows 10 Pro X64

My System SpecsSystem Spec

19 Aug 2011   #4

Windows 7 Professional x64

No solution thus far. For now, I just added the domains in question to my Hosts file, so the DNS queries have stopped. I may never find out what's really going on.
My System SpecsSystem Spec

 How to Identify the PID Making a DNS Query

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