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TROJ_VB.TXS

October 08, 2012
 Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by other malware. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

225,280 by bytes

File Type:

EXE

Memory Resident:

Yes

Arrival Details

This Trojan may be dropped by other malware.

However, as of this writing, the said sites are inaccessible.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\ufxw.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It injects itself into the following processes running in the affected system's memory:

  • Explorer.exe

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\
CurrentVersion\Winlogon
Taskman = %User Profile%\Application Data\ufxw.exe

Download Routine

This Trojan accesses the following websites to download files:

  • {BLOCKED}tshows.org
  • {BLOCKED}agehost.com
  • {BLOCKED}fe-networking-at-home.com
  • {BLOCKED}LEGALNESS.COM
  • {BLOCKED}veyourbodylots.org

  SOLUTION

Minimum Scan Engine:

8.900

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
    CurrentVersion\Winlogon
    • Taskman = %User Profile%\Application Data\ufxw.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.TXS. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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