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
LVL 17
JohnGerhardtAsked:
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infernumCommented:
You can block it using Domain group policy, under software restrictions, hash rule.
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JohnGerhardtAuthor Commented:
Can you give me some more information on exactly what I need to do..
Thanks,
-Jaggie
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infernumCommented:
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?
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Managing Security Policy in a Changing Environment

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JohnGerhardtAuthor Commented:
W2k3 Domain, Shall have a look through your links and get back to you.
-Jaggie
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infernumCommented:
Ok sure, take your time. If any more help needed i will be glad to help.
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gbw48Commented:
Jaggie,
Are you using SSL intercept on Bluecoat. If you are then you should be able to block all SSL traffic that is non categorized which ultra surf's servers are.
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JohnGerhardtAuthor Commented:
Thanks, We got an SSL card for the Bluecoat and we can now block ultrasurf to our hearts content..! Nasty little app for admins!
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solutiontrackerCommented:
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..
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NorthernTel & Telebec Managed ServicesManaged I.T. SupportCommented:
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/
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