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To remove a trojan horse(normal) follow these step with nothen antivirus
Discovered: February 19, 2004
Updated: August 15, 2007 3:51:25 PM
Also Known As: Trojan-Spy.HTML.Smitfraud.c [Kaspersky], Phish-BankFraud.eml.a [McAfee], Trj/Citifraud.A [Panda Software], generic5 [AVG]
Type: Trojan
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
Disable System Restore (Windows Me/XP).
Update the virus definitions.
Run a full system scan and delete all the files detected.
Delete any values added to the registry.
Edit the Win.ini file.
Edit the System.ini file.
Clear the Temporary Internet Files folder.
For specific details on each of these steps, read the following instructions.
1. To disable 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:
How to disable or enable Windows Me System Restore
How to turn off or turn on Windows XP System Restore
Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.
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. To update 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 Virus Definitions (LiveUpdate).
Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. 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 Virus Definitions (Intelligent Updater).
The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.
3. To scan for and delete 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, take note of the file names, and click Delete.
If the infected files are detected in the \Temporary Internet Files\Content.IE5, due to the design of the operating system, you will not be able to delete them. Write down the entire path and file name and clear the Temporary Internet Files Folder at the end of the removal instructions.
Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.
After the files are deleted, restart the computer in Normal mode and proceed with the next section.
Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:
Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.
4. To delete the value from the registry
Important: 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 subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
Click Start > Run.
Type regedit
Click OK.
Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.
Navigate to the subkeys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunServicesOnce
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrenVersion\RunServicesOnce
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnceEx
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
In the right pane, delete any value that refers to a file that was detected during the scan.
Exit the Registry Editor.
5. To edit the Win.ini file
WARNING: The following steps instruct you to remove the text from the run= line of the Win.ini file. If you are using older programs, they may load at startup from one of these lines. If you are sure that the text contained in these lines is for the programs that you normally use, then we suggest that you do not remove it.
If you are running Windows 95/98/Me, follow these steps:
Click Start > 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=[TROJAN FILE NAME]
Note: [TROJAN FILE NAME] refers to the file name detected during the scan.
If this line exists, delete everything to the right of run=
Click File > Save.
Click File > Exit.
6. To edit the System.ini file
If you are running Windows 95/98/Me, follow these steps:
Click Start > Run.
Type the following:
edit c:\windows\system.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 [boot] section of the file, look for a line similar to:
shell = Explorer.exe [TROJAN FILE NAME]
Note: [TROJAN FILE NAME] refers to the file name detected during the scan.
If this line exists, delete everything to the right of Explorer.exe.
When you are done, it should look like:
shell = Explorer.exe
Click File > Save.
Click File > Exit.
7. To clear the Temporary Internet Files folder, if required
Log on to the computer using the name that was shown in the path that you wrote down in the scan and delete infected files section.
For example, if the path was:
C:\Documents and Setting\Linda\Local Settings\Temporary Internet Files\qrwmqczd.dll
log on to the computer as Linda.
Start Internet Explorer.
Click Tools > Internet Options.
In the Temporary Internet Files section, click the Delete Files button.
Check Delete all offline content, and then click OK.
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