W32.Erkez.B@mm is a mass-mailing worm that sends itself to the email addresses found on an infected computer. It also copies itself to the folders that are likely to be shared on file-sharing networks.
When this worm infects a computer, it attempts to overwrite .exe files. The files that it targets are usually executables that belong to security products, including Symantec products. However, in some cases, the worm may overwrite .exe files that belong to other programs.
If the worm does overwrite .exe files, some programs or operating system functions may no longer work correctly.
This threat is compressed with FSG.
The worm does not have a static MD5 value.
Antivirus Protection Dates
Initial Rapid Release version June 11, 2004
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version June 11, 2004
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date June 13, 2004
Click for a more detailed description of Rapid Release and Daily Certified virus definitions.
Wild Level: Medium
Number of Infections: 50 - 999
Number of Sites: More than 10
Geographical Distribution: Low
Threat Containment: Easy
REMOVALRemoval using the W32.Erkez.B@mm Removal Tool
Use the W32.Erkez.B@mm removal tool
first, as it is the easiest way to remove this threat.
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
- Disable System Restore (Windows Me/XP).
- Update the virus definitions.
- Restart the computer in Safe mode or VGA mode.
- Run a full system scan and delete all the files detected as W32.Erkez.B@mm.
- Reverse the changes made to the registry.
For specific details on each of these steps, read the following instructions.
Alternate steps if the worm has already run.
If the worm has already run, it may have overwritten files that Symantec AntiVirus and Norton AntiVirus products require. If you cannot start your Norton or Symantec antivirus product in steps 2 or 4, follow this alternate procedure:
1. To disable System Restore (Windows Me/XP)
- Restart in Safe mode or VGA mode (step 3.).
- Edit the registry (step 5).
- Restart in Normal mode.
- Re-install Symantec AntiVirus or Norton AntiVirus.
- Follow steps 1 through 5.
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.
Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.
Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.
For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable System Restore by following the instructions in the aforementioned documents.
For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder," Article ID: Q263455.
2. To update 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:
3. To restart the computer in Safe mode or VGA mode
- Running LiveUpdate, which is the easiest way to obtain 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).
- 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).
The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
4. To scan for and delete the infected files
- For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
- For Windows NT 4 users, restart the computer in VGA mode.
5. To reverse the changes made to the registry
- Start your Symantec antivirus program and make sure that it is configured to scan all the files.
- Run a full system scan.
- If any files are detected as infected with W32.Erkez.B@mm, click Delete.
Symantec strongly recommends that you back up the registry before making 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.
- Click Start > Run. (The Run dialog box appears.)
- Type regedit
Then click OK. (The Registry Editor opens.)
- Navigate to the key:
- In the right pane, delete the value that refers to the worm file.
- Navigate to the key and delete it:
- Exit the Registry Editor.
- Restart the computer in Normal mode. For instructions, read the section on returning to Normal mode in the document, "How to start the computer in Safe Mode."