VBS.Legal.A is a Visual Basic Script worm that copies itself to several folders on the hard disk and to a floppy disk if one is inserted in the floppy disk drive. The worm overwrites files with .vbs and .vbe extensions if they are located in the C:\Windows or C:\Windows\Samples folders.
The worm also overwrites files that have .vbs and .vbe extensions if they are located in the C:\Windows or C:\Windows\Samples folders.
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.
To remove this worm, follow the instructions in the order shown.
Remove the worm
Run LiveUpdate to make sure that you have the most recent virus definitions.
Start Norton AntiVirus (NAV), and run a full system scan, making sure that NAV is set to scan all files.
If any files are found to be infected by VBS.Legal.A, write down the file name if it is located in C:\Windows\System or on a floppy disk, and then choose Delete.
NOTE: If .vbs or .vbe files existed in the C:\Windows or C:\Windows\Samples folders, you will have to restore them from a backup.
Edit the registry
CAUTION: We strongly recommend that you back up the system registry before making any changes. Incorrect changes to the registry could result in permanent data loss or corrupted files. Please make sure you modify only the keys specified. Please see the document How to back up the Windows registry before proceeding.
Click Start, and click Run. The Run dialog box appears.
Type regedit and then click OK. The Registry Editor opens.
