http://localghost.org/posts/a-traffic-analysis-of-windows-10
A Traffic Analysis of Windows 10

Some Czech guy did a traffic analysis
<http://aeronet.cz/news/analyza-windows-10-ve-svem-principu-jde-o-pouhy-terminal-na-sber-informaci-o-uzivateli-jeho-prstech-ocich-a-hlasu/>
of data produced by Windows 10, and released his findings the other day.
His primary thesis was that Windows 10 acts more like a terminal than an
operating system -- because of the extent of the "cloud" integration, a
large portion of the OS functions are almost dependant on remote
(Microsoft's) servers. The amount of collected information, even with
strict privacy settings, is quite alarming.
Information transmitted

*All text typed on the keyboard* is stored in temporary files, and sent
(once per 30 mins) to:

oca.telemetry.microsoft.com.nsatc.net

pre.footprintpredict.com

reports.wes.df.telemetry.microsoft.com

There isn't a clear purpose for this, considering there there's no
autocorrect/prediction anywhere in the OS. The implications of this are
significant: because this is an OS-level keylogger, all the data you're
trying to transmit securely is now sitting on some MS server. This includes
passwords and encrypted chats. This also includes the on-screen keyboard,
so there is no way to authenticate to a website without MS also getting
your password.

*Telemetry* is sent once per 5 minutes, to:

vortex.data.microsoft.com

vortex-win.data.microsoft.com

telecommand.telemetry.microsoft.com

telecommand.telemetry.microsoft.com.nsatc.net

oca.telemetry.microsoft.com

oca.telemetry.microsoft.com.nsatc.net

sqm.telemetry.microsoft.com

sqm.telemetry.microsoft.com.nsatc.net

You might think that "telemetry" has to do with OS usage or similar...
turns out it's telemetry about the user. For example, typing a phone number
anywhere into the Edge browser transmits it to the servers above. In
another example, *typing the name of any popular movie* into your *local*
file search starts a telemetry process that indexes all media files on your
computer and transmits them to:

df.telemetry.microsoft.com

reports.wes.df.telemetry.microsoft.com

cs1.wpc.v0cdn.net

vortex-sandbox.data.microsoft.com

pre.footprintpredict.com

It's hard to imagine any purpose for this other than the obvious piracy
crackdown possiblities.

When a *webcam* is first enabled, ~35mb of data gets immediately
transmitted to:

oca.telemetry.microsoft.com

oca.telemetry.microsoft.com.nsatc.net

vortex-sandbox.data.microsoft.com

i1.services.social.microsoft.com

i1.services.social.microsoft.com.nsatc.net

*Everything that is said into an enabled microphone* is immediately
transmitted to:

oca.telemetry.microsoft.com

oca.telemetry.microsoft.com.nsatc.net

vortex-sandbox.data.microsoft.com

pre.footprintpredict.com

i1.services.social.microsoft.com

i1.services.social.microsoft.com.nsatc.net

telemetry.appex.bing.net

telemetry.urs.microsoft.com

cs1.wpc.v0cdn.net

statsfe1.ws.microsoft.com

If this weren't bad enough, *this behaviour still occurs after Cortana is
fully disabled/uninstalled*. It's speculated that the purpose of this
function to build up a massive voice database, then tie those voices to
identities, and eventually be able to identify anyone simply by picking up
their voice, whether it be a microphone in a public place or a wiretap on a
payphone.

Interestingly, if Cortana is enabled, the voice is first transcribed to
text, then the transcription is sent to:

pre.footprintpredict.com

reports.wes.df.telemetry.microsoft.com

df.telemetry.microsoft.com

If *Windows is left unattended* for ~15 mins, a large volume of traffic
starts being transmitted to various servers. This may be the raw audio
data, rather than just samples.
Other concerns

While the inital reflex may be to block all of the above servers via HOSTS,
it turns out this won't work: Microsoft has taken the care to hardcode
certain IPs, meaning that there is no DNS lookup and no HOSTS consultation.
However, if the above servers are blocked via HOSTS, Windows will pretend
to be crippled by continuously throwing errors, while still maintaining
data collection in the background. Other than an increase in errors, HOSTS
blocking did not affect the volume, frequency, or rate of data being
transmitted.

*Original article
<http://aeronet.cz/news/analyza-windows-10-ve-svem-principu-jde-o-pouhy-terminal-na-sber-informaci-o-uzivateli-jeho-prstech-ocich-a-hlasu/>,
credit AE News*



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