1. Symantec/
  2. Security Response/
  3. W32.Cone.D@mm


Risk Level 2: Low

March 10, 2004
February 13, 2007 12:18:54 PM
Systems Affected:

When W32.Cone.D@mm runs, it does the following:
  1. Copies itself to the following files:
    • %Windir%\tasks\svchost.exe
    • %System%\01enel.dll
    • %Temp%\svchost.exe
    • %Temp%\an27XXX.exe

    • %Windir% is a variable: The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.
    • %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
    • %Temp% is a variable. The worm locates the temporary folder and copies itself to that location. By default, this is C:\Windows\TEMP (Windows 95/98/Me), or C:\WINNT\Temp (Windows NT/2000), or C:\Document and Settings\<UserName>\Local Settings\Temp (Windows XP).

  2. Copies itself as WebCheck.pif into the current user's startup folder and the All Users startup folders.

    On Windows NT/2000/XP computers, these folders are:
    • C:\Documents and Settings\All Users\Start Menu\Programs\Startup
    • C:\Documents and Settings\<current user>\Start Menu\Programs\Startup

      On Windows 95/98/Me computers these folders are:
    • C:\WINDOWS\All Users\Start Menu\Programs\StartUp
    • C:\WINDOWS\Start Menu\Programs\StartUp

  3. Creates the file, %Temp%\Doc, and opens it with Notepad.exe. %Temp%\Doc contains some garbage data. The worm deletes this file after it is displayed.

  4. Adds a value:

    "Task Monitoring Service"="%Windir%\tasks\svchost.exe"

    to the registry keys:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

      so that the worm runs when you start Windows.

  5. Creates the following files:
    • %Temp%\n27xxx.dip (A zip archive of the worm)
    • %Temp%file.dll (A MIME-64-encoded zip archive of the worm)
    • %Windir%\Cyclone.v0.0002.htm (This file, which is 877 bytes, is not viral by itself.)
    • %Temp%01http.dll
    • %System%\01check.dll
    • %System%\01eml.dll
    • %System%\01seml.dll
    • %System%\01url.dll
    • %System%\01vis.dll

  6. Creates the mutex "<the infected computer name>!This is the first real version :"

    This mutex allows only one instance of the worm to execute.

  7. Retrieves email addresses from files with the following extensions:
    • .mbx
    • .wab
    • .html
    • .eml
    • .htm
    • .asp
    • .shtml
    • .txt
    • .dbx

  8. Uses its own SMTP engine to send itself to the email addresses found above.

    The email has the following characteristics:
    From: <spoofed>
    Subject: (One of the following)
    • RE: the attachment is in the SKY [weN]
    • How cute is your credit card number!! :))
    • E-mail account disabling warning for %s
    • the attachment is in the SKY [weN]
    • Hi
    • i have your password :)
    • RE: Thank You!
    • RE: details (%s)
    • Password Reset For %s
    • Undelivered Mail Returned to Sender (%s)
    • about you
    • Your account (%s) will be closed
    • Your IP has been logged
    • Mail Delivery System (%s)
    • Mail Transaction Failed (%s)
    • IMPORTANT %s!
    • Confidential user information!

      where %s is the recipient name.

      Message: (One of the following)
    • Hi lucky,
      The attachment is a virus do not open it.
      I write it to say : we don't want islamic republic in IRAN!
      I'm realy sorry, I'm damaging some computers that I don't want to damage!!!!
    • Dear user of <recipient name>,
      We warn you about some attacks on your e-mail account. Your computer may contain viruses, in order to keep your computer and e-mail account safe,
      please, follow the instructions.
      The Management,
           The <recipient's domain> team                       http: //www.<recipient's domain>
    • take it easy
    • I have your password :)
    • The zip archive attached.<br>extract it and then read the text file!
    • i zip your password (and some other info) :))
      I have it too!
      you can change it, but...!
    • Warning!!!
      This message contains (attached) users personal info and you may not use it for personal use,
      remember that you accept the agreement,
      and you are responsible for any kind of misuse of the users personal info.
    • i zip it for you.
    • i can't find anything usefull in your attachment.
    • See the attached file for details
    • your credit card information attached :))
    • do you can imagine?
      a <random letters> in a zip file!
    • The message contains Unicode (Chinese) characters and has been sent as an attachment (in binary).
    • Details Attached.

      Attachment: The attachment file name is <eight random letters or digits>.exe. The worm may send a .zip file containing this executable.


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
Summary| Technical Details| Removal

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
  • Twitter
  • Facebook
  • LinkedIn
  • Google+
  • YouTube