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Discovered: November 28, 2001
Updated: February 13, 2007 11:37:51 AM
Also Known As: W32.Eira.57344@mm, I-Worm.Quamo
Type: Trojan Horse, Worm

W32.Eira.A@mm is an Internet worm that carries a payload that overwrites files. The file name of this worm suggests that it is a demo of the Quake4 game, but it is not.

Antivirus Protection Dates

  • Initial Rapid Release version November 29, 2001
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version November 29, 2001
  • Latest Daily Certified version September 28, 2010 revision 036

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

Writeup By: Patrick Nolan

Discovered: November 28, 2001
Updated: February 13, 2007 11:37:51 AM
Also Known As: W32.Eira.57344@mm, I-Worm.Quamo
Type: Trojan Horse, Worm

This Internet worm has an icon resembling an installation program:

When this worm is run, it displays the following Welcome box:

  • If you click Next, the worm does not do anything.
  • If you click Cancel, the worm is executed.

When the worm is executed, it does the following:

It copies itself to the \Windows folder as:
  • Quake4demo.exe
  • Honey.exe
  • Setup.exe

It creates a folder named C:\Eira and then it copies itself to that folder as the file Quake4demo.exe.

It copies itself to the root of drive F (if it exists) as Quake4demo.exe.

Next, it sends email to everyone in the Microsoft Outlook address book, using varying combinations of subject, message, and attachment file names, chosen at random from the following lists:

Possible subject lines:
  • Something very special
  • I know you will like this
  • Yes, something I can share with you
  • Wait till you see this!
  • A brand new game! I hope you enjoy it

Possible messages:
  • Is Internet that safe?
    Check it out
  • Hey you, take a look at the attached file. You won't believe your eyes when you open it!
  • You like games like Quake? You will enjoy this one.
  • Did you see the pictures of me and my battery operated boyfriend?
  • My best friend
    This is something you have to see!
    Till next time

Possible attachment file names:
  • Quake4demo.exe
  • Honey.exe
  • Setup.exe

Files with the .exe extension that are in the same folder as this worm may be overwritten with text that replaces the entire file. The new file size will be 199 bytes and it will contain the following text:

You've didn't protected your files well enough

Let this be a lesson! Never trust someone else

eiram 1999-2001

The registry is also modified to launch the worm at Windows startup.

If the worm is run, and you either log off of Windows or restart the computer, two splash screens as shown previously may be displayed. If you click Cancel, the worm runs again.


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.

Writeup By: Patrick Nolan

Discovered: November 28, 2001
Updated: February 13, 2007 11:37:51 AM
Also Known As: W32.Eira.57344@mm, I-Worm.Quamo
Type: Trojan Horse, Worm

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

  1. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
  2. Run a full system scan.
  3. Delete all files that are detected as W32.Eira.A@mm. Overwritten .exe files must be replaced from a clean backup or reinstalled.

Writeup By: Patrick Nolan