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TROJ_VB.JUE

June 06, 2013
 ALIASES:

TrojanDownloader:Win32/Troxen!rts (Microsoft); Trojan.Adclicker (Symantec); Trojan-Downloader.Win32.VB.tnb (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic16.OZQ.dropper (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

85,330 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

17 May 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan creates the following folders:

  • %Program Files%\17wan

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nse1.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\genjudi\
minibrowser

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
???? (?? ctrl+d)

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
???? (?? ctrl+d)\Recent File List

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
???? (?? ctrl+d)\Settings

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}\InprocServer32

HKEY_CLASSES_ROOT\wanyouxi.Class

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\genjudi\
minibrowser
targeturl = "tongji.tv678.net/index5.htm"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}\TypeLib
Version = "4.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
ProgID = "wanyouxi.Class"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
TypeLib = "{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
VERSION = "4.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
wanyouxi.Class
Clsid = "{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\17wan\game19.exe
  • %Program Files%\17wan\hosts
  • %Program Files%\17wan\minibrowser.exe
  • %Program Files%\17wan\del.bat

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Close all opened browser windows

Step 3

Delete this registry key

[ 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\genjudi
    • minibrowser
  • In HKEY_CURRENT_USER\Software
    • Local AppWizard-Generated Applications
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
    • ???? (?? ctrl+d)
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\???? (?? ctrl+d)
    • Recent File List
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\???? (?? ctrl+d)
    • Settings
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}
    • 4.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}\4.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {418CEA46-62FC-4435-8AB1-59DB59D233BC}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID
    • {A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • wanyouxi.Class

Step 4

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\genjudi\minibrowser
    • targeturl = "tongji.tv678.net/index5.htm"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • NoExplorer = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
    • NoExplorer = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}\TypeLib
    • Version = "4.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
    • ProgID = "wanyouxi.Class"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
    • TypeLib = "{2EF23F42-6E17-429A-BF3F-D5EECFFE8E5B}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}
    • VERSION = "4.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\wanyouxi.Class
    • Clsid = "{A9DAB0AE-882B-4E70-AA9A-A2F21F30D447}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
    • ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{418CEA46-62FC-4435-8AB1-59DB59D233BC}
    • ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Step 5

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Program Files%\17wan\game19.exe
  • %Program Files%\17wan\hosts
  • %Program Files%\17wan\minibrowser.exe
  • %Program Files%\17wan\del.bat

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\17wan

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.JUE. 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.

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nse1.tmp


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