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Published Nov 27, 2006 | Updated Sep 15, 2017

Worm:Win32/Zotob.D!CME-702

Detected by Microsoft Defender Antivirus

Aliases: Win32/Sdbot.worm!MS05-039 (McAfee) W32.Zotob.D (Symantec) IRCBot.et (F-secure) W32/Dogbot-A (Sophos)

Summary

Worm:Win32/Zotob.D is a backdoor Trojan that targets computers running Microsoft Windows 2000 that do not have MS05-039 installed. It can also infect computers running other versions of Windows operating systems if it is delivered through e-mail, instant messaging, or other routes. The Trojan connects to an IRC server from the infected computer to receive commands from attackers.
To recover manually from infection by Worm:Win32/Zotob.D, follow these steps:
  1. Install Windows security update MS05-039.
  2. Disconnect from the Internet.
  3. End the Trojan process.
  4. Delete the Trojan file from your computer.
  5. Delete the Trojan registry entry.
  6. Restart your computer.
  7. Take steps to prevent re-infection.

Install Windows security update MS05-039

To install MS05-039 using Windows Update
  1. Go to the Windows Update Web site at windowsupdate.microsoft.com.
  2. On the Windows Update site, click Scan for Updates. Windows Update scans your computer and returns a list of critical updates, including service packs.
  3. In the Pick updates to install list, click Critical Updates and Service Packs. Windows Update creates a list of the updates appropriate for your computer, including MS05-039 if it is not installed. Critical updates are selected for download automatically.
  4. Click Review and install updates, and then click Install Now. You may need to restart your computer after installing the updates.

Disconnect from the Internet

To help ensure that your computer is not actively infecting other computers, disconnect it from the Internet before proceeding. Print this Web page or save a copy on your computer; then unplug your network cable and disable your wireless connection. You can reconnect to the Internet after completing these steps.

End the Trojan process

To end the Trojan process
  1. Press CTRL+ALT+DEL once and click Task Manager.
  2. Click Processes and click Image Name to sort the running processes by name.
  3. Select the process windrg32.exe, and click End Process.

Delete the Trojan file from your computer

To delete the Trojan file from your computer
  1. Click Start, and click Run.
  2. In the Open field, type the name of the system folder, for example C:\Windows\System32 
  3. Click OK.
  4. Click Name to sort the folders and files by name.
  5. Delete the folder wbev if it is in the list. This deletes the wbev folder as well as the Trojan file it contains.
  6. On the Desktop, right-click the Recycle Bin and click Empty Recycle Bin.
  7. Click Yes to confirm the deletion.

Delete the Trojan registry entry

Worm:Win32/Zotob.D creates an entry in the Windows registry that causes the Trojan to run each time Windows starts. This entry should be deleted.
To delete the Trojan registry entry
  1. On the Start menu, click Run.
  2. Type regedit and click OK.
  3. In the left pane, navigate to the key:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  4. In the right pane, right-click the following value, if it exists: WinDrg32
  5. Click Delete and click Yes to delete the value.
  6. Close the Registry Editor.

Restart your computer

To restart your computer
  1. On the Start menu, click Shut Down.
  2. Select Restart from the drop-down list and click OK.

Take steps to prevent re-infection

Do not reconnect your computer to the Internet until the computer is protected from re-infection. See the "Preventing Infection" section for more information.
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