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Discovered: July 18, 2001
Updated: February 13, 2007 11:36:52 AM
Type: Virus

W32.HLLO.Videoinf is a virus that overwrites .ht* and .exe files in the folder that it is executed from. It sends information from the computer on which it is run to an email address. On certain dates, the virus will modify the C:\Autoexec.bat file so that the hard drive will be formatted when the computer is restarted.

Antivirus Protection Dates

  • Initial Rapid Release version July 18, 2001
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version July 18, 2001
  • Latest Daily Certified version August 20, 2008 revision 016

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

W32.HLLO.Videoinf is a virus written in a high-level language. The virus, when executed, does the following:

  1. It overwrites all .ht* files (for example, .htm and .html) in the same folder as the virus with a copy of itself.
  2. It extracts information from the registry and sends it to an email address. It is highly likely that this email address belongs to the author of the virus.
  3. It then overwrites all *.exe files in the in the same folder as the virus with a copy of itself.
  4. Next, it determines whether or not it should execute the payload routine.
  5. It then displays the message:

Details on sent information
The information that is extracted from the registry and sent as an email message is as follows:
  • Operating System
  • Operating System Version
  • RegisteredOwner
  • RegisteredOrganisation
  • ProductName
  • ProductKey
  • ProductID
  • HostName

After the email has been sent, the virus sets a registry key so that this action is not performed more than once.

The Payload will be executed on the following dates of each month.
  • 3rd
  • 4th
  • 10th
  • 20th

The payload consists of modifying the C:\Autoexec.bat file so that the C drive is formatted when you restart the computer.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • 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.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a 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.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. 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.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.


Run LiveUpdate to make sure that you have the most recent virus definitions.

  1. Start Norton AntiVirus (NAV), and run a full system scan, making sure that NAV is set to scan all files.
  2. Delete any files detected as W32.HLLO.Videoinf. If necessary, replace them from a clean backup.
  3. If the payload has run, and you have not yet restarted the computer, follow these steps before doing so:

    NOTE: (For Windows Me users only) Due to the file protection process in Windows Me, there may be a backup copy of the file you are about to edit in the C:\Windows\Recent folder. We recommend that you delete this file before you continue with the steps in this section. To do so using Windows Explorer, go to C:\Windows\Recent, and, in the right pane, select the Autoexec.bat file and delete it. It will be regenerated as a copy of the file that you are about to edit when you save your changes to that file.
    1. Click Start, and then click Run.
    2. Type the following, and then click OK.

      edit c:\autoexec.bat

      The MS-DOS Editor opens.
    3. Remove any lines that contain the command format, such as format c:
    4. Click the File menu, and then click Save.
    5. Click the File menu, and then click Exit.

Writeup By: Neal Hindocha