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NOVOTS KMS .: 病毒安全 .: 清除Infostealer.Lineage病毒要点

清除Infostealer.Lineage病毒要点

清除Infostealer.Lineage病毒要点

 Infostealer.Lineage 

 

 

Risk Level 1: Very Low

 

 

SUMMARY

 

Discovered: January 11, 2005

Updated: May 10, 2006 04:21:13 PM ZE9

Also Known As: PWSteal.Lineage

Type: Trojan Horse

Infection Length: 230,400 bytes

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

 

Infostealer.Lineage is a Trojan horse that attempts to steal the password to the "Lineage" online game and send it to the creator of the Trojan.

 

NOTE : Definitions prior to May 10, 2006 may detect this threat as PWSteal.Lineage

 

ProtectionVirus Definitions (LiveUpdate™ Weekly) January 12, 2005

Virus Definitions (Intelligent Updater) January 12, 2005

Threat AssesmentWildWild Level: Low

Number of Infections: 0 - 49

Number of Sites: 0 - 2

Geographical Distribution: Low

Threat Containment: Easy

Removal: Moderate

DamageDamage Level: Low

Releases Confidential Info: Steals passwords to the "Lineage" online game.

DistributionDistribution Level: Low

 

Writeup By: John Park

 

TECHNICAL DETAILS

 

Discovered: January 11, 2005

Updated: May 10, 2006 04:21:13 PM ZE9

Also Known As: PWSteal.Lineage

Type: Trojan Horse

Infection Length: 230,400 bytes

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

 

When Infostealer.Lineage is executed, it performs the following actions:

 

 

Copies itself as one of the following:

 

 

%ProgramFiles%\rundll32.exe

%ProgramFiles%\explorer.exe

%ProgramFiles%\Internat.exe

%Windir%\rundll32.exe

%Windir%\Internat.exe

 

Notes:

 

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP)or

C:\Winnt (Windows NT/2000).

%System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP)

%ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.

The genuine Microsoft "rundll32.exe" exists in %system%.

The genuine Microsoft "Internat.exe" exists in %system%.

The genuine Microsoft "explorer.exe" exists in %windir%.

 

 

Adds one of the following values:

 

"[Random Name]" = "%ProgramFiles%\rundll32.exe"

"[Random Name]" = "%ProgramFiles%\explorer.exe"

"[Random Name]" = "%ProgramFiles%\Internat.exe"

"[Random Name]" = "%windir%\rundll32.exe"

"[Random Name]" = "%windir%\Internat.exe"

 

to the registry key:

 

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

 

so that the Trojan runs every time Windows starts.

 

 

Creates the following file:

 

%system%\htdll.dll

 

 

Emails the gathered Lineage passwords to addresses at the following domains:

 

 

pchome.com.tw

tom.com

163.com

 

 

RecommendationsSymantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

 

Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.

If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.

Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.

Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.

Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.

Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.

Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.

 

Writeup By: John Park

 

REMOVAL

 

Discovered: January 11, 2005

Updated: May 10, 2006 04:21:13 PM ZE9

Also Known As: PWSteal.Lineage

Type: Trojan Horse

Infection Length: 230,400 bytes

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

 

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.

Restart the computer in Safe mode.

Run a full system scan and delete all the files detected as Infostealer.Lineage.

Reverse the changes made to the registry.

 

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, re-enable 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 the 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 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.

 

 

3. To restart the computer in Safe mode

Windows 95/98/Me/NT/2000/XP

Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."

 

4. 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 as infected with Infostealer.Lineage, click Delete.

If you are still in Safe mode, restart the computer in Normal mode before proceeding to the next section.

 

 

5. To reverse the changes made to 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. Read the document, "How to make a backup of the Windows registry," for instructions.

 

Click Start > Run.

Type regedit

 

Then click OK.

 

 

Navigate to the key:

 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

 

 

In the right pane, delete the value:

 

"[Random Name]" = "%ProgramFiles%\rundll32.exe"

"[Random Name]" = "%ProgramFiles%\explorer.exe"

"[Random Name]" = "%ProgramFiles%\Internat.exe"

"[Random Name]" = "%windir%\rundll32.exe"

"[Random Name]" = "%windir%\Internat.exe"

 

 

Exit the Registry Editor.

 


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