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How to block ultrasurf?

Hi experts,

Anybody out there know how to solidly block the software ultrasurf.
I am the administrator for my coporate firewall and we also have in place a bluecoat filtering system. Both are at my disposal to stop this little app from surfing un filtered etc.

Any help greatfully recevied...

-Jaggie

infernum

You can block it using Domain group policy, under software restrictions, hash rule.

JohnGerhardt

ASKER

Can you give me some more information on exactly what I need to do..
Thanks,
-Jaggie

infernum

Check these links

http://support.microsoft.com/kb/324036

http://technet.microsoft.com/en-us/library/bb457006.aspx

http://technet2.microsoft.com/windowsserver/en/library/ad3b6293-4a22-46a5-a95b-7c50ca1fd1fb1033.mspx

If you need a step by step procedure i can give that to you.

Do you have a domain? if so, is it windows based? 2000 or 2003?

JohnGerhardt

ASKER

W2k3 Domain, Shall have a look through your links and get back to you.
-Jaggie

infernum

Ok sure, take your time. If any more help needed i will be glad to help.

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JohnGerhardt

ASKER

Thanks, We got an SSL card for the Bluecoat and we can now block ultrasurf to our hearts content..! Nasty little app for admins!

solutiontracker

Hi,

Even if you don't have ssl card, you may only allow the allowed categories in BCWF and deny the rest. i.e. default deny policy.

This will work since you only need to block based on IPs which are configurable even without ssl interception.

best of luck..

NorthernTel & Telebec Managed Services

I have a script I created that blocks write access to a certain part of the user registry. Ultrasurf needs to be able set it's own address as a proxy in windows. My blog explains it in more detail http://www.chrisleblanc.org/block-ultrasurf-workstation-level-windows/