TROJ_VB.JL

Malware type: Trojan

Aliases: Trojan.Win32.VB.jl (Kaspersky), Generic VB.c (McAfee), Trojan Horse (Symantec), TR/VB.JL (Avira),

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Low

Distribution potential:

Low

Description: 

This Trojan is a downloader program. Its task to be install itself on a system.

Its installation starts by getting the path of the Start Menu Programs folder. It then creates a new folder named Xtray in the Start Menu programs.

In this folder, it creates the batch file Uninstall Xtray.bat.

The contents of this batch file run the file UninstallXtray.exe.

It also creates the script file Xtrayinst.ftp in the Windows Temp folder. This contains FTP command lines.

This Trojan then runs the following program using the said script file.

    %Windows%system32\ftp.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Running this program results in the download of files from the FTP server srvtray.com, which are saved as the following files:

  • C:\Program Files\Xtray\UninstallXtray.exe
  • C:\Program Files\Xtray\Xtray.bup
  • C:\Program Files\Xtray\Xtray.cfg
  • C:\Program Files\Xtray\Xtray_link.exe

This Trojan logs on to the FTP server using an anonymous account.

Once the download is complete, it creates an autorun registry entry. It then silently opens the following Web site:

    http://sr<BLOCKEd>ay.com/new_install.asp?time=<current system time>

It notifies the said Web site that another copy of this Trojan has been installed in a system. The website returns the word "Done".

This Trojan runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Sep. 10, 2004 4:38:17 AM GMT -0800
Description updated: Dec. 13, 2004 1:15:08 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 35,968 Bytes

Initial samples received on: Aug 21, 2004

Details:

This Trojan is a downloader program. Its task to be install itself on a system.

Its installation starts by getting the path of the Start Menu Programs folder. It then creates a new folder named Xtray in the Start Menu programs.

In this folder, it creates the batch file Uninstall Xtray.bat.

The contents of this batch file run the file UninstallXtray.exe.

It also creates the script file Xtrayinst.ftp in the Windows Temp folder. This contains FTP command lines.

This Trojan then runs the following program using the said script file.

    %Windows%system32\ftp.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Running this program results in the download of files from the FTP server srvtray.com, which are saved as the following files:

  • C:\Program Files\Xtray\UninstallXtray.exe
  • C:\Program Files\Xtray\Xtray.bup
  • C:\Program Files\Xtray\Xtray.cfg
  • C:\Program Files\Xtray\Xtray_link.exe

This Trojan logs on to the FTP server using an anonymous account.

Once the download is complete, it creates the following autorun registry entry:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
Xtray = "C:\Program Files\Xtray\xtray_link.exe"

It then silently opens the following Web site:

    http://sr<BLOCKEd>ay.com/new_install.asp?time=<current system time>

It notifies the said Web site that another copy of this Trojan has been installed in a system. The website returns the word "Done".




Analysis by: Reginald Wong

Revision History:

First pattern file version: 2.292.06
First pattern file release date: Aug 21, 2004

SOLUTION


Minimum scan engine version needed: 6.810

Pattern file needed: 2.465.02

Pattern release date: Mar 3, 2005


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE all files detected as _VB.JL .

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro�s free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    � On Windows 95, 98, and ME, press
    CTRL%20ALT%20DELETE
    � On Windows NT, 2000, and XP, press
    CTRL%20SHIFT%20ESC, then click the Processes tab.
  2. In the list of running programs*, locate the malware file(s) detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 95, 98, and ME, Windows Task Manager may not show certain processes. You can use a third party process viewer such as Process Explorer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    Xtray = "C:\Program Files\Xtray\xtray_link.exe"
  4. Close Registry Editor.

NOTE: If you were not able to terminate the malware process as described in the previous procedure, restart your system.

Deleting Malware File and Folder

  1. Right-click Start then click Search� or Find�, depending on the version of Windows you are running.
  2. In the Named input box, type:
    Xtray
  3. In the Look In drop-down list, select the drive that contains Windows, then press Enter.
  4. Once located, select the folder then press Delete.
  5. Repeat this procedure to delete the following file:
    xtrayinst.ftp

Important/Additional Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure sets.

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as TROJ_VB.JL. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro�s free online virus scanner.


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