W32.Jonbarr.D@mm

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Discovered: September 05, 2003
Updated: February 13, 2007 12:07:01 PM
Also Known As: W32/Pepex@MM [McAfee]
Type: Worm
Systems Affected: Windows



W32.Jonbarr.D@mm, which is a variant of the W32.Jonbarr@mm worm, is a mass-mailing worm that uses its own SMTP engine to send itself to all the email addresses it finds in the .htm files and in temporary Internet files. Additionally, the worm attempts to terminate the processes of various antivirus programs.

The email has the following characteristics:

Subject:
Microsoft Windows Patch
or
Re:hya
From:  "Microsoft" <support@microsoft.com>
Reply-To:  "Microsoft" <microsoft@microsoft.com>
Message:  Please open the attachment if want to get supprise!
Attachment: install.exe

When the attachment is opened, W32.Jonbarr.D@mm displays the message:

Happy Birthday My!

Merdeka!

W32.Jonbarr.D@mm is written in the Microsoft C++ programming language and is compressed with UPX.

Antivirus Protection Dates

  • Initial Rapid Release version September 05, 2003
  • Latest Rapid Release version October 26, 2017 revision 038
  • Initial Daily Certified version September 05, 2003
  • Latest Daily Certified version October 27, 2017 revision 003
  • Initial Weekly Certified release date September 10, 2003

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

Writeup By: Yuhui Huang

Discovered: September 05, 2003
Updated: February 13, 2007 12:07:01 PM
Also Known As: W32/Pepex@MM [McAfee]
Type: Worm
Systems Affected: Windows


When W32.Jonbarr.D@mm runs, it performs the following actions:

    1. Copies itself as %SystemRoot%\system\<two or three random digits>.exe.


      Note: %SystemRoot% is a variable. The worm locates the windows folder and copies itself to system\ folder under that location. By default, %SystemRoot% is C:\Windows (Windows 95/98/Me), C:\Winnt (Windows NT/2000), or C:\Windows (Windows XP).


    2. Creates the file, C:\b46.log, which is the MIME64-encoded worm.

    3. Adds the value:

      "Nero.ma"="%SystemRoot%\system\<two or three random digits>.exe"

      to the registry key:

      HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

      so that the worm runs when you restart Windows.

    4. Displays the following message:




    Spread routine

    The worm retrieves your email address and SMTP server IP address from the registry. It retrieves email addresses from the .htm files and temporary Internet files. Then, the worm uses its own SMTP engine to send itself to all the email addresses it finds.

    W32.Jonbarr.D@mm may also use a predefined SMTP server to email itself.

    The email message has the following characteristics:

    Subject:
    Microsoft Windows Patch
    or
    Re:hya
    From:  "Microsoft" <support@microsoft.com>
    Reply-To:  "Microsoft" <microsoft@microsoft.com>
    Message:  Please open the attachment if want to get supprise!
    Attachment: install.exe

    Each time the worm runs, it registers its process as a service. And, it ends the processes that contain any of the following strings:
    • VSHW
    • FIREW
    • MCAFEE
    • SWEEP
    • TDS2-
    • TRAP
    • PCCW
    • ANTIVIR
    • ALERT
    • SCAN
    • NOD32


    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: Yuhui Huang

    Discovered: September 05, 2003
    Updated: February 13, 2007 12:07:01 PM
    Also Known As: W32/Pepex@MM [McAfee]
    Type: Worm
    Systems Affected: Windows


    The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

    1. Disable System Restore (Windows Me/XP).
    2. Update the virus definitions.
    3. Restart Windows in Safe mode or VGA mode.
    4. Run a full system scan and delete all the files detected as W32.Jonbarr.D@mm.
    5. Delete the value that was added to the registry.
    For specific details on each of these steps, read the following instructions.

    1. Disabling System Restore (Windows Me/XP)
    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:
    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. 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 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.

    3. Restarting the computer in Safe mode or VGA mode
    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.
    • 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.


    4. 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.Jonbarr.D@mm, click Delete.

    4. Deleting the value from the registry


    WARNING: 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.
    1. Click Start, and then click Run. (The Run dialog box appears.)
    2. Type regedit, and then click OK. (The Registry Editor opens.)
    3. Navigate to the following key:

      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    4. In the right pane, delete the value:

      "Nero.ma"="%SystemRoot%\system\<two or three random digits>.exe"

    5. Click Registry, and then click Exit.


    Writeup By: Yuhui Huang