W32.Campurf@mm

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Discovered: January 02, 2003
Updated: February 13, 2007 11:52:30 AM
Type: Worm
Systems Affected: Windows


W32.Campurf@mm is a mass-mailing worm that uses Microsoft Outlook to send itself to all the contacts in the Outlook Address Book. The worm terminates some antivirus and firewall processes and attempts to delete files associated with the registry. The email has the following characteristics:

Subject:   Some One Looking for you!
Message:   How to get a money in one days bussiness? The answer is inside the attachment.
Attachment: Fc.exe

The threat is written the Microsoft Visual Basic programming language and is compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version January 03, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version January 03, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date January 04, 2003

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

Writeup By: Yana Liu

Discovered: January 02, 2003
Updated: February 13, 2007 11:52:30 AM
Type: Worm
Systems Affected: Windows


When W32.Campurf@mm runs, it does the following:

  1. Locates the current user's Application Data folder and Startup folder by looking in the registry key

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
    Explorer\Shell Folders
  2. Copies itself as:
    • <The current user's Application Data folder>\Runfc.exe. The attributes of the files are set to Hidden and System.
    • <The current user's Startup folder>\FatCat.exe.

      The locations of these folders will vary with the operating system. For example, on Windows 2000, the locations may be at C:\Documents and Settings\<user name>\Application Data and C:\Documents and Settings\<user name>\Start Menu\Program\Startup. On Windows 98, they may be at C:\Windows\Local Settings\Application Data and C:\Windows\Start Menu\Program\Startup.
  3. Adds the value

    fc <The current user's Application Data folder>\runfc.exe

    to the registry key

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs when you restart Windows.
  4. May copy itself to the Windows installation folder as Fc.exe.
  5. Retrieves the location of the Internet Explorer download folder from

    KEY_CURRENT_USER\Software\Microsoft\Internet Explorer
  6. May copy itself to the aforementioned folder using many different file names carried by the worm. For example:
    • Ghostreacon.avi
    • Happynewyear.jpg
    • Run in the sky.mov
    • Rice and curry.mp3
    • Bugbear solution.mpg
    • What and who.gif
    • Flash animation.swf
    • Estimate.mp4
    • Hackers description.doc
    • HOW TO BLOCK AN EMAIL THAT CONTAIN A VIRUS.txt
  7. May set the value data of the Start Page of the value name in the registry key,

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

    to http:\ \vx.netlux.org\~melhacker\fc.exe.
  8. May delete these files:
    • C:\Windows\System.dat
    • C:\Windows\User.dat
    • C:\Windows\System.da0
    • C:\Windows\User.da0
  9. Terminates some antivirus and firewall processes. The worm inventories the active processes, and if the name of the process is one of the following, it terminates the process:
    • VControl.EXE
    • Zonealarm.exe
    • Wfindv32.exe
    • Webscanx.exe
    • Vsstat.exe
    • Vshwin32.exe
    • Vsecomr.exe
    • Vscan40.exe
    • Vettray.exe
    • Vet95.exe
    • Tds2-Nt.exe
    • Tds2-98.exe
    • Tca.exe
    • Tbscan.exe
    • Sweep95.exe
    • Sphinx.exe
    • Smc.exe
    • Serv95.exe
    • Scrscan.exe
    • Scanpm.exe
    • Scan95.exe
    • Scan32.exe
    • Safeweb.exe
    • Rescue.exe
    • Rav7win.exe
    • Rav7.exe
    • Persfw.exe
    • Pcfwallicon.exe
    • Pccwin98.exe
    • Pavw.exe
    • Pavsched.exe
    • Pavcl.exe
    • Padmin.exe
    • Avnt.exe
    • Outpost.exe
    • Nvc95.exe
    • Nupgrade.exe
    • Normist.exe
    • Nmain.exe
    • Nisum.exe
    • Navwnt.exe
    • Navw32.exe
    • Navnt.exe
    • Navlu32.exe
    • Navapw32.exe
    • N32scanw.exe
    • Mpftray.exe
    • Moolive.exe
    • Luall.exe
    • Lookout.exe
    • Lockdown2000.exe
    • Jedi.exe
    • Iomon98.exe
    • Iface.exe
    • Icsuppnt.exe
    • Icsupp95.exe
    • Icmon.exe
    • Icloadnt.exe
    • Icload95.exe
    • Ibmavsp.exe
    • Ibmasn.exe
    • Iamserv.exe
    • Iamapp.exe
    • Frw.exe
    • Fprot.exe
    • Avp.exe
    • Fp-Win.exe
    • Findviru.exe
    • f-Stopw.exe
    • f-Prot95.exe
    • f-Prot.exe
    • f-Agnt95.exe
    • Espwatch.exe
    • Esafe.exe
    • Ecengine.exe
    • Dvp95_0.exe
    • Dvp95.exe
    • Cleaner3.exe
    • Cleaner.exe
    • Claw95cf.exe
    • Claw95.exe
    • Cfinet32.exe
    • Cfinet.exe
    • Cfiaudit.exe
    • Cfiadmin.exe
    • Blackice.exe
    • Blackd.exe
    • Avwupd32.exe
    • Avwin95.exe
    • Avsched32.exe
    • Avpupd.exe
    • Avptc32.exe
    • Avpm.exe
    • Avpdos32.exe
    • Avpcc.exe
    • Avp32.exe
    • Avkserv.exe
    • Avgctrl.exe
    • Ave32.exe
    • Avconsol.exe
    • Autodown.exe
    • Apvxdwin.exe
    • Anti -Trojan.exe
    • Ackwin32.exe
    • _Avpm.exe
    • _Avpcc.exe
    • _Avp32.exe

  10. Uses Microsoft Outlook to send itself to all the contacts in the Outlook Address Book. The email has the following characteristics:

Subject:   Some One Looking for you!
Message:   How to get a money in one days bussiness? The answer is inside the attachment.
Attachment: Fc.exe

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: Yana Liu

Discovered: January 02, 2003
Updated: February 13, 2007 11:52:30 AM
Type: Worm
Systems Affected: Windows


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. Run a full system scan, and delete all files that are detected as W32.Campurf@mm.
  4. Delete the value

    fc <current user's application data folder>\runfc.exe

    from the following registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  5. Reset your Internet Explorer Home page.


For details on how to do this, read the following instructions.

Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain the virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate), in the "Protection" section, at the top of this writeup.
  • Downloading the definitions using the Intelligent Updater. The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater), in the "Protection" section, at the top of this writeup.

    The Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

Restarting the computer in Safe mode
All Windows 32-bit operating systems, except Windows NT, can be restarted in Safe mode. For instructions on how to do this, read the document, "How to start the computer in Safe Mode ."

Scanning for and deleting the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Campurf@mm, click Delete.

Editing the registry

CAUTION : Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, then click Run. (The Run dialog box appears.)
  2. Type regedit, then click OK. (The Registry Editor opens.)
  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    in the right pane, and delete this value:

    fc <current user's application data folder>\runfc.exe
  4. Exit the Registry Editor.

Reseting the Internet Explorer home page
  1. Start Microsoft Internet Explorer.
  2. Connect to the Internet and go to the page you want to set as your Home page.
  3. Click Tools, then click Internet Options.
  4. In the Home page section of the General tab, click Use Current, and then click OK.


Writeup By: Yana Liu