Windows services run within host processes. Observing the traffic using Windows 8's Resource Monitor, I see traffic generated by
svchost.exe (netsvcs). It appears to be directed towards an IP address controlled by a major Croatian ISP.
The address is 18.104.22.168.
Traffic generated by
svchost.exe (NetworkService) is directed toward a (very similar) 22.214.171.124. Sniffing with Wireshark reveals that HTTP requests toward 126.96.36.199 include
/msdownload/... in the URL.
GET /msdownload/update/v3/static/trustedr/en/authrootstl.cab?edc2fcdacea5cc1a HTTP/1.1 Connection: Keep-Alive Accept: */* User-Agent: Microsoft-CryptoAPI/6.3 Host: ctldl.windowsupdate.com HTTP/1.1 200 OK Cache-Control: max-age=604800 Content-Type: application/octet-stream Last-Modified: Fri, 04 Oct 2013 00:14:07 GMT Accept-Ranges: bytes ETag: "80f18a496c0ce1:0" Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET Content-Length: 54009 Date: Tue, 22 Oct 2013 12:44:14 GMT Connection: keep-alive
This leads me to conclude these are both members of a Microsoft CDN in Croatia.
I have attempted to disable Windows Update service, but the download from .215 continued. This is troublesome; during summer, I had over 200mb downloaded over 3G within 10 minutes before I noticed what was happening. This was only minutes after I paid for 1gb of traffic to my provider. I really don't like Microsoft wasting my money after being explicitly told NOT to download any updates in the background.
Today I noticed this again. While I am not connecting via cellphone at this point, I'd love to know the solution to the issue once and for all.
Since I don't feel like disabling services at random hoping I'll hit the one that generates traffic, I'd highly prefer identifying which service is creating traffic.
How do I identify which background service initiated the download? How do I identify which background services are generating network traffic?