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Backdoor.Graybird - Removal

Summary

technical details

removal

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Discovered:

April 2, 2003

Updated:

February 13, 2007 :10 AM

Also Known As:

Backdoor.GrayBird KAV, BackDoor-ARR McAfee

Type:

Trojan Horse

Systems Affected:

Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

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

Update the virus definitions.

Do one of the following:

Windows 95/98/Me: Restart the computer in Safe mode.

Windows NT/2000/XP: End the Trojan process.

Run a full system scan and delete all the files detected as Backdoor.Graybird.

Reverse the changes that the Trojan made to the registry.

Reverse the changes that the Trojan made to the Win.ini file Windows 95/98/Me only.

For details on each of these steps, read the following instructions.

1. 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.

2. Restarting the computer in Safe mode or ending the Trojan process

Windows 95/98/Me

Restart the computer in Safe mode. All the Windows 32-bit operating systems, except for Windows NT, can be restarted in Safe mode. For instructions on how to do this, read the document, How to start the computer in Safe Mode.

Windows NT/2000/XP

To end the Trojan process:

Press Ctrl Alt Delete once.

Click Task Manager.

Click the Processes tab.

Double-click the Image Name column header to alphabetically sort the processes.

Scroll through the list and look for Svch0st.exe.

If you find the file, click it, and then click End Process.

Exit the Task Manager.

3. Scanning for and deleting the infected files

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 that a Symantec Corporate antivirus product is set to scan All Files.

Run a full system scan.

If any files are detected as infected with Backdoor.Graybird, click Delete.

4. Reversing the changes made to the registry

CAUTION: 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, and then click Run. The Run dialog box appears.

Type regedit

Then click OK. The Registry Editor opens.

Navigate to each of these the keys:

HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows CurrentVersion Run

HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows CurrentVersion

RunServices

HKEY_CURRENT_USER Software Microsoft Windows CurrentVersion Run

NOTE: All the keys do not exist on all the systems.

For each one, in the right pane, delete any of the following values:

svchost System Svch0st.exe

winlogon System Winlogon.exe

system System Explorer.exe

ravmond System Explorer.exe

If you are running Windows NT/2000/XP, navigate to the key:

HKEY_CURRENT_USER Software Microsoft Windows NT CurrentVersion Windows

In the right pane, delete the value:

run system svch0st.EXE

run system ravmond.exe

Exit the registry editor.

4. Reversing the changes made to the Win.ini file

If you are running Windows 95/98/Me, follow these steps:

The function you perform depends on your operating system:

Windows 95/98: Go to step b.

Windows Me: If you are running Windows Me, the Windows Me file-protection process may have made a backup copy of the Win.ini file that you need to edit. If this backup copy exists, it will be in the C: Windows Recent folder. Symantec recommends deleting this file before continuing with the steps in this section. To do this:

Start Windows Explorer.

Browse to and select the C: Windows Recent folder.

In the right pane, select the Win.ini file and delete it. The Win.ini file will be regenerated when you save your changes to it in step f.

Click Start, and then click Run.

Type the following:

edit c: windows win.ini

and then click OK. The MS-DOS Editor opens.

NOTE: If Windows is installed in a different location, make the appropriate path substitution.

In the windows section of the file, look for a line similar to:

run C: WINDOWS SYSTEM SVCH0ST.EXE

If this line exists, delete the entire line.

Click File, and then click Save.

Click File, and then click Exit.

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