W32.Prolin.Worm

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Discovered: November 30, 2000
Updated: February 13, 2007 11:47:43 AM
Also Known As: TROJ_SHOCKWAVE.A, CREATIVE, TROJ_PROLIN.A
Type: Worm


W32.Prolin.Worm uses Microsoft Outlook to email a copy of itself to everyone in the Outlook address book. The worm moves all .mp3, .jpg, and .zip files to the root folder. It renames each of these files and appends the following text to the extension of each file:

change atleast now to LINUX

Antivirus Protection Dates

  • Initial Rapid Release version November 30, 2000
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version November 30, 2000
  • 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: Cary Ng

Discovered: November 30, 2000
Updated: February 13, 2007 11:47:43 AM
Also Known As: TROJ_SHOCKWAVE.A, CREATIVE, TROJ_PROLIN.A
Type: Worm


W32.Prolin.Worm does the following:

  1. It uses Microsoft Outlook to email a copy of itself to everyone in the Outlook address book.
    • The attachment is named Creative.exe.
    • The subject of the infected message is

      A great Shockwave flash movie.
    • The body of the infected message is

      Check out this new flash movie that I downloaded just now ... It's Great Bye
  2. It sends a message to a Yahoo email account.
    • The subject of the message is

      Job complete
    • The body of the message

      Got yet another idiot
  3. The worm creates a copy of itself with the name Creative.exe in the C:\Windows\Start Menu\Programs\Startup folder. This will run the worm each time you start Windows.

    NOTE: It will be able to do this only if C:\Windows is your default Windows folder.
  4. The worm then moves all .mp3, .jpg, and .zip files to the root folder. It renames each of these files and appends the following text to the extension of each file:

    change atleast now to LINUX
  5. The worm copies the Messageforu.txt file to the root of drive C. The file contains the text

    Hi, guess you have got the message. I have kept a list of files that I have infected under this. If you are smart enough just reverse back the process. i could have done far better damage, i could have even completely wiped your harddisk. Remember this is a warning & get it sound and clear... - The Penguin


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: November 30, 2000
Updated: February 13, 2007 11:47:43 AM
Also Known As: TROJ_SHOCKWAVE.A, CREATIVE, TROJ_PROLIN.A
Type: Worm


To remove W32.Prolin.Worm:

  1. Find and delete all copies of the Creative.exe file.
  2. Open an MS-DOS window and rename the files that were renamed by the worm back to their original extensions.
  3. Move the files back to their original locations.

NOTE: If you have not already done so, do not restart the computer. As part of its routine when W32.Prolin.Worm is run, it searches the hard disk for files that have the .mp3, .jpg, and .zip file extensions. It then moves (not copies) these files to the root of drive C. It then renames each of these files and appends the text change atleast now to LINUX to the extension of each file. For example, if you had a file named Company picnic.jpg in the C:\Documents and Settings\Administrator\My Documents folder, the file name would be changed to Company picnic.jpgchange atleast now to LINUX, and it would be in the root of drive C.

The worm also creates the C:\Messageforu.txt file. If you subsequently restart the computer, the Messageforu.txt file is deleted. This file contains a list of the .jpg and .zip files that were moved to the root of drive C. It also contains the original locations of the moved files. If you have restarted the computer and this file no longer exists, then it is still possible to recover the files, but it will be more difficult to return them to their original locations.

To find and delete the Creative.exe files:
  1. Click Start, point to Find or Search, and click Files or Folders.
  2. Make sure that "Look in" is set to (C:) and that Include subfolders is checked.
  3. In the "Named" or "Search for..." box, type--or copy and paste--the following file name:

    creative.exe
  4. Click Find Now or Search Now.
  5. Delete the files that appear in the list.

To rename the files:
  1. Click Start, point to Programs, and click MS-DOS Prompt or Command Prompt.
  2. Type each of the following, and press Enter after each one. Note that there is a space between the second and the third asterisks.

    CD\
    ren *.jpg* *.jpg
    ren *.zip* *.zip
    ren *.mp3* *.mp3
  3. Close the DOS window.

To move the files back to their original locations:
  1. Start Windows Explorer.
  2. In the left pane select drive C.
  3. In the right pane look for the file C:\Messageforu.txt.
    • If it does not exist, skip to step 4.
    • If it does exist:
      1. Double-click the file to open it in Notepad. The file is a list of all files that were moved and renamed, including their original locations.
      2. Use the file as a guide to move the .jpg, and .zip files from the root of drive C to their original locations. To do this, go on to step 4.
  4. In the right pane select one of the files that has been moved to the root of drive C, either as indicated by the C:\Messageforu.txt file, or simply because it is a file with the .mp3, .jpg, or .zip extension. Such files should not be stored in the root of drive C.
  5. Click Edit, and click Cut.
  6. In the left pane, browse to and select the folder to which you want to move the file. This could be the original location as listed in the C:\Messageforu.txt file or a different location of your choice.
  7. Click Edit, and click Paste. This moves the file to the new (or original) location.
  8. Repeat steps 1 through 7 for all files that must be moved.


Writeup By: Cary Ng