W32.Blebla.B.Worm - Removal

These instructions are for all the current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

1. Restart the computer in Safe mode.
2. Copy Regedit.exe to Regedit.com.
3. Edit the registry and undo the changes made by the worm.
4. Configure Windows to show all the files.
5. Find and delete the files saved to the hard drive by the worm.
6. Restart in Normal mode.
7. Update the virus definitions.
8. Run a full system scan and delete all the files detected as W32.Blebla.B.Worm.

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

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."

Copying Regedit.exe to Regedit.com
Because the worm modified the registry so that you cannot run the .exe files, first make a copy of the Registry Editor as a file with the .com extension, then run the file.

1. Do one of the following, depending on which version of Windows you are running:
   • Windows 95/98 users:
     1. Click Start.
     2. Point to Programs.
     3. Click the MS-DOS Prompt. (A DOS window opens at the C:\Windows prompt.) Proceed to step 2 of this section.
   • Windows Me users:
     1. Click Start.
     2. Point to Programs.
     3. Point to Accessories.
     4. Click the MS-DOS Prompt. (A DOS window opens at the C:\Windows prompt.) Proceed to step 2 of this section.
   • Windows NT/2000 users:
     1. Click Start, then click Run.
     2. Type command, then press Enter. (A DOS window opens.)
     3. Type cd \winnt, then press Enter.
     4. Go to step 2 of this section.
   • Windows XP users:
     1. Click Start, then click Run.
     2. Type command, then press Enter. (A DOS window opens.)
     3. Type the following:
        
        cd\
        cd \windows
        
        Then press Enter after typing each one.
        
     4. Proceed to step 2 of this section.
        
2. Type copy regedit.exe regedit.com, then press Enter.
   
3. Type start regedit.com, then press Enter. (The Registry Editor will open in front of the DOS window.)

Editing the registry

CAUTION: We strongly recommend that you back up the system registry before making any changes to it. Incorrect changes to the registry may result in permanent data loss or corrupted files. Be sure to modify the specified keys only. See the document, "How to back up the Windows registry," before proceeding.

1. Navigate to and open the following key:
   
   HKEY_CLASSES_ROOT\.exe
   
   CAUTION: Make sure that you go to the .exe subkey (note the period) and not the exefile subkey, which is farther down in the list.
   
2. In the right pane, double-click Default. (The Edit String dialog box appears.)
3. Delete the contents of the Value data box, then type: exefile.
   
4. Click OK. The key should now look like this:
   
   
   
   
5. Navigate to and select the following key: HKEY_CLASSES_ROOT\rnjfile.
   
   NOTE: In this case, there is no period before the first letter.
   
6. Press Delete, then click Yes to confirm.
7. Click the Edit menu and click Find.
8. In the Find what box, type rnjfile and press Enter
   
   
   You must change any resultant entries to the correct settings. Entries will be found in many keys. These key names begin with a period. You must edit the Default value for each key to change it back to the correct setting. Some of the keys that the worm can change, as well as their original values (when known) are shown in the following list. Repeat the search for rnjfile until more instances of the entry are not found in the registry. Press F3 to do so.
   
   NOTE: This list is provided for your convenience. The values on your system may differ from those listed. In some cases, you may need to re-install the software called by the damaged key.
   
   .arj (The Zip program you are using)
   .avi AVIFile
   .bmp Paint.Picture
   .doc (Double-click the .doc subkey and change the Default value to reflect the latest version of Word; for example, Word.Document.8.)
   .gif giffile
   .jpeg jpegfile
   .jpe
   .jpg jpegfile
   .lha
   .mp2 mpegfile
   .mp3 mp3file
   .mpeg mpegfile
   .mpg mpegfile
   .rar
   .reg regfile
   .vqf
   .wma
   .wmf
   .wmv
   .xls (Double-click the .doc subkey and change the Default value to reflect the latest version of Excel; for example, Excel.Sheet.8.)
   .zip (The Zip program you are using)
   
9. Exit the Registry Editor and close the remaining DOS window.
10. Restart the computer, then run LiveUpdate.

Configuring Windows to show all the files

1. Start Windows Explorer.
2. Click the View menu (Windows 95/98/NT) or the Tools menu (Windows Me/2000/XP), then click the Options or Folder options.
3. Click the View tab.
4. Uncheck "Hide file extensions for known file types."
5. Do one of the following:
   • Windows 95/NT: Click "Show all files."
   • Windows 98: In the Advanced settings box, under the "Hidden files" folder, click Show all files.
   • Windows Me/2000/XP: Uncheck "Hide protected operating system files," and under the "Hidden files" folder, click "Show hidden files and folders."
6. Click Apply, then click OK.

Finding the files and folder left by the worm

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 box, type, or copy and paste, the following text:
   
   sysrnj*.* xromeo*.* xjuliet*.* 001.txt 002.txt
   
4. Click Find Now. The results are displayed.
   
   NOTE: In the next step, you will be directed to delete the resultant files. In most cases, these files will include Xromeo.exe, Xjuliet.chm, and Sysrnj.exe. If you have a minor variant, or if the worm has run more than once, the files could have slightly different names, such as Xromeo.lgc, Xromeo(1).exe, Xjuliet(1).chm, and so on. In most cases, you should delete all these files. If you think that the file could be a legitimate program file, because the file name differs substantially, we suggest that you first record the location of the file, and then copy the file to a clearly marked floppy disk before you delete it.
   
5. Delete each file, clicking Yes to confirm its deletion.
6. Click New Search, then click OK to confirm.
7. In the Named box, type Hi, then click Find Now.
8. If a folder named Hi is found, delete it.
9. Close the Find Files window.
10. Right-click the Recycle bin icon on the Windows desktop and click Empty Recycle Bin.

Restarting in Normal mode
Restart the computer and allow it to start as you normally would.

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.

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.
   • For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
   • For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan All Files."
2. Run a full system scan.
3. If any files are detected as infected with W32.Blebla.B.Worm, click Delete.

Technical Details