W32.Datom.Worm exists as three files:
Msvxd.exe
Msvxd16.dll
Msvxd32.dll
These files are located in the %Windir% folder.
NOTE: %Windir% is a variable. The worm locates the Windows main installation folder (by default this is C:\Windows or C:\Winnt) and copies itself to that location.
The tasks in each file have likely been separated in an attempt to avoid heuristic detection:
Msvxd.exe simply runs Msvxd16.dll.
Msvxd16.dll adds a reference to Msvxd.exe to the registry and then runs Msvxd32.dll.
Msvxd32.dll enumerates network shares and copies all three files to those shares into the %Windir% folder and adds a reference to Msvxd.exe in the Run= line in Win.ini.
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.
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.
NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
1. Update the virus definitions.
2. Restart in Safe mode.
3. Delete the value
MSVXD
from the registry key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run
4. Delete the Run= line in the Win.ini file if it refers to Msvxd.exe
5. Run a full system scan, and delete all files that are detected as W32.Datom.Worm
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