Difference between revisions of "How to Detect and Block UltraSurf program traffic"

From MikroTik Wiki
Jump to: navigation, search
m (UltraSurf)
 
m (UltraSurf)
Line 22: Line 22:
  
 
  UltraSurf can discover its proxy servers by the following ways  
 
  UltraSurf can discover its proxy servers by the following ways  
 +
 
1-A cache file of proxy server IPs stored in the user’s local temp directory from a  
 
1-A cache file of proxy server IPs stored in the user’s local temp directory from a  
 
previous execution
 
previous execution
Line 31: Line 32:
 
5-Once Ultrasurf discovers a proxy server in its network, it can retrieve IP addresses of  
 
5-Once Ultrasurf discovers a proxy server in its network, it can retrieve IP addresses of  
 
other proxy servers directly from that server  """ copied  
 
other proxy servers directly from that server  """ copied  
 +
 +
 
by using the last link i tried to capture packet coming from UltraSurf using wireshark on port 443
 
by using the last link i tried to capture packet coming from UltraSurf using wireshark on port 443
 
to see which server they are connecting to on port 443
 
to see which server they are connecting to on port 443
Line 37: Line 40:
 
so i made an address-list and added these address to them  
 
so i made an address-list and added these address to them  
  
/ip firewall address-list
+
firewall address-list rules
add address=65.49.0.0/17 comment="" disabled=no list=UltraSurfServers
+
 
add address=72.0.0.0/8 comment="" disabled=no list=UltraSurfServers
+
    ip firewall address-list
add address=204.107.140.0/24 comment="" disabled=no list=UltraSurfServers
+
    add address=65.49.0.0/17 comment="" disabled=no list=UltraSurfServers
 +
    add address=72.0.0.0/8 comment="" disabled=no list=UltraSurfServers
 +
    add address=204.107.140.0/24 comment="" disabled=no list=UltraSurfServers

Revision as of 02:49, 10 July 2011

hi you know after my successful experiment to block Hotspot Shield , we have tried other different types of programs to bypass network policy and one of the most fastest program is UltraSurf [www.ultrareach.com] you know it is more faster than Hotspot Shield and it does not need to be installed and you can download it in EXE file , you just need double click on it and run it but it is more sophisticated in the way it operate and the way it get their proxy server ip addresses

""Ultrasurf sets up a local proxy on the user’s computer, and then configures Internet Explorer’s proxy settings to run all Internet requests through that local proxy. It works automatically with Internet Explorer; however, the user can also use Firefox or any other browser that supports a proxy configuration by manually changing the browser’s proxy settings. The default port is 9666

The user can then browse any Internet site normally using IE. All traffic funnels through the local Ultrasurf proxy. Since the traffic between Ultrasurf and IE is entirely on the localhost, it never goes to the network and can’t be blocked by a network device.

Ultrasurf then sets up an encrypted connection with a remote server in its network of proxy servers

The connection to the remote proxy server is made over port 443, which is the standard HTTPS port

UltraSurf can discover its proxy servers by the following ways 

1-A cache file of proxy server IPs stored in the user’s local temp directory from a previous execution 2-DNS requests to external DNS servers, which return encoded IPs of proxy servers. 3-A document on Google Docs containing a rapidly updated, signed and encrypted list of active proxy servers 4- static list of proxy server IPs built into the program 5-Once Ultrasurf discovers a proxy server in its network, it can retrieve IP addresses of other proxy servers directly from that server """ copied


by using the last link i tried to capture packet coming from UltraSurf using wireshark on port 443 to see which server they are connecting to on port 443 i found three major servers with the following range 204.107.140.0/24 , 65.49.0.0/17, 72.0.0.0/8 so i made an address-list and added these address to them

firewall address-list rules

   ip firewall address-list
   add address=65.49.0.0/17 comment="" disabled=no list=UltraSurfServers
   add address=72.0.0.0/8 comment="" disabled=no list=UltraSurfServers
   add address=204.107.140.0/24 comment="" disabled=no list=UltraSurfServers