PLATFORM:

Windows

 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: 1,687,942 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 10 Jan 2015

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:

  • %User Profile%\Application Data/Wanbao

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
LiuLiangZB = "%Windows%\wbmoney.exe /autorun"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
wbmoney.exe = "%Windows%\wbmoney.exe"

Other System Modifications

This Trojan modifies the following file(s):

  • %Windows%\inf\intl.PNF

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It deletes the following files:

  • %Windows%\TbViewer.exe_bak
  • È«×Ô¶¯¹Ò»ú׬ǮÈí¼þ.exe
  • %Windows%\wbmoney.exe_bak
  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %System%\kbd101b.dll
  • %System%\kbd101c.dll
  • %System%\kbd103.dll
  • %System%\kbd106.dll
  • %System%\kbdjpn.dll
  • %System%\kbdkor.dll

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
?????????

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
?????????\Setting

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
?????????\Setting
UsrID = "375918"

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
?????????\Setting
LastRun = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "0"

Dropping Routine

This Trojan drops the following files:

  • __tmp_rar_sfx_access_check_51640
  • Config.ini
  • TbViewer.exe
  • updatezb.exe
  • UserImages.bmp
  • wbmoney.exe
  • 66.bat
  • %Windows%\TbViewer11291540.zip
  • %Windows%\TbViewer.exe
  • %Windows%\wbmoney11291540.zip
  • %Windows%\wbmoney.exe
  • %System%\SET14.tmp
  • %System%\SET1A.tmp
  • %System%\SET20.tmp
  • %System%\SET26.tmp
  • %System%\SET2C.tmp
  • %System%\SET32.tmp

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://upload.{BLOCKED}9.cc/gj/ver.txt
  • http://upload.{BLOCKED}9.cc/gj/TbViewer11291540.zip
  • http://upload.{BLOCKED}9.cc/gj/wbmoney11291540.zip
  • http://6688.{BLOCKED}9.cc
  • {BLOCKED}3.220.244
  • {BLOCKED}0.1
  • {BLOCKED}3.218.246
  • {BLOCKED}3.220.234

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.700

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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software
    • Local AppWizard-Generated Applications
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
    • ?????????
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\?????????
    • Setting
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • CpMRU

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • LiuLiangZB = "%Windows%\wbmoney.exe /autorun"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • wbmoney.exe = "%Windows%\wbmoney.exe"
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\?????????\Setting
    • UsrID = "375918"
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\?????????\Setting
    • LastRun = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Enable = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Size = "a"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • InitHits = "64"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Factor = "14"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "0"

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.
  • __tmp_rar_sfx_access_check_51640
  • Config.ini
  • TbViewer.exe
  • updatezb.exe
  • UserImages.bmp
  • wbmoney.exe
  • 66.bat
  • %Windows%\TbViewer11291540.zip
  • %Windows%\TbViewer.exe
  • %Windows%\wbmoney11291540.zip
  • %Windows%\wbmoney.exe
  • %System%\SET14.tmp
  • %System%\SET1A.tmp
  • %System%\SET20.tmp
  • %System%\SET26.tmp
  • %System%\SET2C.tmp
  • %System%\SET32.tmp

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.
  • %User Profile%\Application Data/Wanbao

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOAD.WI. 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 deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Windows%\inf\intl.PNF

Step 9

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.

  • %Windows%\TbViewer.exe_bak
  • È«×Ô¶¯¹Ò»ú׬ǮÈí¼þ.exe
  • %Windows%\wbmoney.exe_bak
  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %System%\kbd101b.dll
  • %System%\kbd101c.dll
  • %System%\kbd103.dll
  • %System%\kbd106.dll
  • %System%\kbdjpn.dll
  • %System%\kbdkor.dll


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