The purpose of this trojan is to "hijack" browser use. When page requests are made, they are rerouted to specified Domain Name Servers. This allows a remote "administrator" to direct users to the pages of their choosing. For example, if an infected user attempted to navigate to
http://www.google.com, they would be routed to a different site.
System changes include:
* A file named HOSTS is created in the %WinDir%\Help directory redirecting popular search URLs (such as google.com, altavista.com, etc) to the IP address 207.44.220.30 [note: this is not the default path to the HOSTS file, the following registry key is created to change the HOSTS path]
o HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\
Tcpip\Parameters "DataBasePath" = %SystemRoot%\help
* Configuring DNS servers to use different IP addresses, such as:
o 69.57.146.14
o 69.57.147.175
* The creation of the following registry key:
* HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Tcpip\Parameters\Interfaces\windows "r0x" = your s0x
* A marker file is created in the Windows directory named winlog
* A temp directory is created and left behind by the trojan:
o c:\bdtmp\tmp