1.DownloadGoogle recommend safer browser Web browser, For more safe , Stay Secure on the Web and stay far away virus,Download URL http://www.oral8.net/firefox/firefox.htm
2. Temporarily Disable System Restore (Windows Me/XP).
3. Update the virus definitions. Reboot computer in SafeMode
4. Run a full system scan and clean/delete all Backdoor.Wnetpols infected files and Delete/Modify any values added to the registry.
Navigate to the subkey and delete the valuesas following:
When the Trojan is executed, it drops a copy of itself to the following location: %System%\wnpms.exe
It also drops the following files, which are DLL libraries:
%Windir%\Temp\wnpms_[RANDOM NUMBERS].tmp
%Windir%\Temp\wnp[RANDOM NUMBERS].tmp
It injects the above libraries into the following processes:
winlogon.exe
explorer.exe
iexplore.exe
The program creates the following registry entries so that it executes whenever Windows starts:
Next, it creates a new service with the following characteristics: Service name: wnpms Display name: Windows Network Policy Manager Service ImagePath: %System%\wnpms.exe Description: Manages network policies deployed defaultly by system services and 3rd party applications. This service can not be stopped
It creates the following registry subkey for the above service: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wnpms
It creates a thread, which creates the above service in a loop so that the threat is recreated if it is deleted.
Next, the Trojan creates the following registry entries in order to bypass the Windows firewall:
The Trojan creates the following mutexes so that only one instance of the threat is running on the computer:
_win32__wnpms_um__
__win32__wnpms_sdm__
It may also create the following event: {8D7F0C62-670A-498D-88A7-2090D29A11F4}
The Trojan monitors its own process in case it is ended. If the process is ended, the Trojan may restart itself.
Next, the Trojan connects to the following remote host and waits for commands from an attacker: dep.mvl0an7.com:19801
The remote attacker may perform some of the following actions on the compromised computer:
UPGRADE
IPLIST
BYE
The Trojan then creates the following file mapping: {6EA9B038-C801-4F76-805F-E41ACF9ED165}
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
5. Exit registry editor .
6.delete the IE temp files or you may download ATF temp files cleaner to run a full cleaning.and restart the computer.
8. Now you may remove Backdoor.Wnetpols successfully.
