Virus:TR/VB.asp
Date discovered:13/09/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:Yes
File size:122.888 Bytes
MD5 checksum:a098d5775d734e760d25f449dba5768d
VDF version:6.35.01.218
IVDF version:6.35.01.222

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan.Win32.VB.asp
   •  F-Secure: Trojan.Win32.VB.asp
   •  Sophos: Troj/VB-CRY
   •  VirusBuster: Trojan.VB.YAZ
   •  Eset: Win32/VB.ASP
   •  Bitdefender: Trojan.VB.ASP


Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\SMHOST.exe
   • %SYSDIR%\WLOGON.exe
   • %current directory%\%executed file%

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "RPCall"="%SYSDIR%\SMHOST.EXE /register"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Run]
   • "System handler"="%SYSDIR%\WLOGON.EXE /register"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   Old value:
   • "ReportBootOk"="1"
   • "Shell"="Explorer.exe"
   • "System"=""
   • "Userinit"="%SYSDIR%\userinit.exe,"
   • "SFCDisable"=dword:00000000
   • "SFCScan"=%user defined settings%
   New value:
   • "ReportBootOk"="0"
   • "Shell"="explorer.exe %SYSDIR%\SMHOST.EXE"
   • "System"="%SYSDIR%\SMHOST.EXE"
   • "Userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\WLOGON.EXE, "
   • "SFCDisable"=dword:ffffff9d
   • "SFCScan"=dword:00000000

– [HKCU\Software\Microsoft\Command Processor]
   Old value:
   • "EnableExtensions"=dword:00000001
   • "AutoRun"=%user defined settings%
   New value:
   • "EnableExtensions"=dword:00000000
   • "AutoRun"="echo off|%SYSDIR%\WLOGON.EXE|cls"

– [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows]
   Old value:
   • "load"=%user defined settings%
   New value:
   • "load"="%SYSDIR%\SMHOST.EXE"

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • "Hidden"=%user defined settings%
   • "HideFileExt"=%user defined settings%
   • "ShowSuperHidden"=%user defined settings%
   New value:
   • "Hidden"=dword:00000002
   • "HideFileExt"=dword:00000001
   • "ShowSuperHidden"=dword:00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\
   CabinetState]
   Old value:
   • "FullPath"=%user defined settings%
   • "FullPathAddress"=%user defined settings%
   New value:
   • "FullPath"=dword:00000001
   • "FullPathAddress"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
   SystemFileProtection]
   Old value:
   • "ShowPopups"=%user defined settings%
   New value:
   • "ShowPopups"=dword:00000000

 File details Programming language:
 The malware program was written in Visual Basic.

Description inserted by Adriana Popa on Friday, November 10, 2006
Description updated by Adriana Popa on Friday, November 10, 2006

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