W32.Fami.worm

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Discovered: March 16, 2001
Updated: February 13, 2007 11:35:48 AM
Type: Worm


W32.Fami.worm is a mass-mailing worm that sends messages to addresses in the Microsoft Outlook address book.

Antivirus Protection Dates

  • Initial Rapid Release version March 16, 2001
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version March 16, 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.

Writeup By: Cary Ng

Discovered: March 16, 2001
Updated: February 13, 2007 11:35:48 AM
Type: Worm


W32.Fami.worm spreads as a 104-KB executable file. The attached file may have the file name Family.exe or Family1.exe.

When executed, W32.Fami.worm creates a copy of itself in the \Windows\System folder as Win32dll.exe and in the \Windows folder as Family.exe. W32.Fami.worm also adds the value

Windows Resource Manager     C:\WINDOWS\SYSTEM\WIN32DLL.EXE

to the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\RunOnce

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run

NOTE: The path to \WIN32DLL.EXE will differ if you have Windows installed to a different location.

Subject line
The email sent by the worm may contain one of the following subject lines:

  • Find you perfect match, whether you are married or not...
  • Check your IQ... IQ Calculator attached...
  • New Microsoft Messesnger, Advanced Version of MSN Messenger attached.
  • See the Family Photo, Bill Clinton on a donkey

Message text
The email sent by the worm may contain one of the following message bodies:
  • How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway check the family photo which i have send as attachment. It's real funny.
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to send your opinions about the family photo to me.
  • How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway find your perfect match for your life. It is in the  file attached. It doesn't matter if you are married or not. It's worth having a look. It's real funny.
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to send your opinions about the Perfect Match to me.
  • How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway check the new New released Microsoft Messenger. It is in the file attached. It doesn't matter if you are using another messenger right now. It's worth having a look. Please include me in your contact list. I am in ahuryy now. I am sure you will excuse me for now. We can chat later through the new messenger. It has advanced options like voice chat, multiple telephonic conversations etc.
    with lots of love
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to include me in Microsoft Messenger. I am sending you this file as attachment so that you can avoid downloading it from Microsoft's slow Server. Bye for now...
  • How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway Calculate your IQ now. It is program which helps you determine your IQ.It is in the file attached. It doesn't matter if you are child or grown-up. It's worth having a look. It's really helpful to know your potential and your problems.
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to send your opinions about the IQ Calculator to me.
  • How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway check this funny game which i have send as attachment. It's real funny.
    Mail me back for any more files. I am sure you will ask me. I have a lot of funny files like these.
    Nothing more for the time being,
    with luv
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to send your opinions about the game to me.
    NOTE: The actual message may be somewhat different. The worm has the ability to use a paragraph from one of the messages shown with a second paragraph from a second message. For example:

    How are you ? I am Fine. I don't know why you did not mail me back for my mails. Anyway Calculate your IQ now. It is program which helps you determine your IQ.It is in the file attached. It doesn't matter if you are child or grown-up. It's worth having a look. It's really helpful to know your potential and your problems.
    Mail me back for any more files. I am sure you will ask me. I have a lot of funny files like these.
    Nothing more for the time being,
    with luv
    Hey, i will write a detailed letter later... Now i am little busy. Do not forget to send your opinions about the IQ Calculator to me.
Depending on the system's current environment, the worm may cause the system to display the text

FAYSAN CORPORATION, INTELLEGENT PROGRAMMER

on the title bar of any program that you open. The program is then closed.

Recommendations

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: Cary Ng

Discovered: March 16, 2001
Updated: February 13, 2007 11:35:48 AM
Type: Worm


To remove this worm, remove the values that it added to the registry, and then scan with Norton AntiVirus to delete any files detected as W32.Fami.worm.

To 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.

  1. Click Start, and click Run. The Run dialog box appears.
  2. Type regedit and then click OK. The Registry Editor opens.
  3. Navigate to the following key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\RunOnce
  4. In the right pane, delete the following value:

    Windows Resource Manager     C:\WINDOWS\SYSTEM\WIN32DLL.EXE
  5. Navigate to the following key:

    HKEY_LOCAL_MACHINE\Software\Microsoft\
    Windows\CurrentVersion\Run
  6. In the right pane, delete the following value:

    Windows Resource Manager     C:\WINDOWS\SYSTEM\WIN32DLL.EXE
  7. Click Registry, and click Exit to save the changes.

To delete the worm:
  1. Run LiveUpdate to make sure that you have the most recent virus definitions.
  2. Start Norton AntiVirus (NAV), and run a full system scan, making sure that NAV is set to scan all files.
  3. Delete any files detected as W32.Fami.worm.


Writeup By: Cary Ng