Backdoor.Assasin.D - Removal

Update the virus definitions
1. Run a full system scan, and delete all the files detected as Backdoor.Assasin.D. Manually delete the files Winreg.dat and Winregk.dat.
2. Delete the value

Net

from the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

For further details, read the following instructions.

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) line 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) line 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 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 Backdoor.Assasin.D, click Delete.
4. Using Windows Explorer, delete the files %Windir%\Winreg.dat and %Windir%\Winregk.dat.

Deleting the value from the registry

CAUTION: Symantec strongly recommends that you back up the registry before you make 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 key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run.

4. In the right pane, delete the value Net.

5. Exit the Registry Editor.

NOTE: You may need to re-install your security products.

Technical Details