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Published Nov 30, 2005 | Updated Sep 15, 2017

TrojanDownloader:Win32/Delf.DH

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

TrojanDownloader:Win32/Delf.DH is a Trojan downloader that targets Microsoft Windows. TrojanDownloader:Win32/Delf.DH then downloads TrojanDownloader:Win32/Delf.AH from a Web site to the infected computer.
 
Updated 12/1/2005: This Trojan is being distributed through an exploit of a vulnerability in Internet Explorer. When the user visits certain Web sites, a malicious script on those sites exploits the Internet Explorer vulnerability described in Microsoft Security Advisory 911302. The script then downloads TrojanDownloader:Win32/Delf.DH to the computer.
To recover offline from infection by TrojanDownloader:Win32/Delf.DH, follow these steps: 
  1. Disconnect from the Internet.
  2. Restart your computer in safe mode.
  3. End the Trojan process.
  4. Delete the Trojan file.
  5. Remove the footprint of the malicious software all.exe that is downloaded to the Windows system folder by TrojanDownloader:Win32/Delf.DH.
  6. Restart your computer.
  7. Take steps to prevent re-infection.

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.

Restart your computer in safe mode

To start your the computer in safe mode
  1. Remove all floppy disks and CDs from your computer, and then restart your computer.
  2. When prompted, press F8. If Windows starts without displaying the Please select the operating system to start menu, restart your computer. Press F8 after the firmware POST process completes, but before Windows displays graphical output.
  3. From the Windows Advanced Options menu, select a safe mode option.

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 process kvg.exe or keks.exe if it is in the list, and click End Process.

Delete the Trojan file

To delete the Trojan file
  1. Click Start, and click Run.
  2. In the Open field, type the path to the user's Startup folder, for example:
    C:\Documents and Settings\<username>\Start Menu\Programs\Startup  
  3. Click OK.
  4. Click Name to sort files by name.
  5. If a file named kvg.exe or keks.exe is in the list, delete it.
  6. On the Desktop, right-click the Recycle Bin and click Empty Recycle Bin.
  7. Click Yes to confirm.
If deleting the file fails, follow these steps to verify that the corresponding process is not running:
  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. Confirm that neither kvg.exe nor keks.exe is in the list.

Remove the footprint of the malicious software all.exe

TrojanDownloader:Win32/Delf.DH downloads the file all.exe to your computer. This is malicious software that is still on your computer after you recover from TrojanDownloader:Win32/Delf.DH. To complete a recovery from the actions of TrojanDownloader:Win32/Delf.DH, you must also remove the footprint created by all.exe.

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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