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Win32.HLLW.Autoruner.53931

Added to the Dr.Web virus database: 2011-07-10

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Classes\WindowFiles\Shell\Open\Command] '' = '%WINDIR%\EXERT.exe "%1" %*'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'ToP' = '%WINDIR%\LSASS.exe'
  • [<HKLM>\SOFTWARE\Clients\StartMenuInternet\INTEXPLORE.pif\shell\open\command] '' = '""%PROGRAM_FILES%\common~1\INTEXPLORE.pif""'
  • [<HKLM>\SOFTWARE\Classes\.exe] '' = 'WindowFiles'
  • [<HKLM>\SOFTWARE\Classes\Applications\iexplore.exe\shell\open\command] '' = '"%PROGRAM_FILES%\Internet Explorer\INTEXPLORE.com" %1'
  • [<HKLM>\SOFTWARE\Classes\htmlfile\shell\open\command] '' = '"%PROGRAM_FILES%\Internet Explorer\INTEXPLORE.com" -nohome'
  • [<HKLM>\SOFTWARE\Classes\HTTP\shell\open\command] '' = '""%PROGRAM_FILES%\common~1\INTEXPLORE.pif"" -nohome'
  • [<HKLM>\SOFTWARE\Classes\ftp\shell\open\command] '' = '"%PROGRAM_FILES%\Internet Explorer\INTEXPLORE.com" %1'
Creates the following files on removable media:
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\command.com
Malicious functions:
Creates and executes the following:
  • %WINDIR%\LSASS.exe 
Modifies file system :
Creates the following files:
  • <SYSTEM32>\dxdiag.com
  • <SYSTEM32>\MSCONFIG.COM
  • %WINDIR%\Debug\DebugProgram.exe
  • <SYSTEM32>\regedit.com
  • %PROGRAM_FILES%\Internet Explorer\INTEXPLORE.com
  • %WINDIR%\LSASS.exe
  • %WINDIR%\EXERT.exe
  • %CommonProgramFiles%\INTEXPLORE.pif
Sets the 'hidden' attribute to the following files:
  • <SYSTEM32>\MSCONFIG.COM
  • <Drive name for removable media>:\command.com
  • <SYSTEM32>\regedit.com
  • <SYSTEM32>\dxdiag.com
  • %PROGRAM_FILES%\Internet Explorer\INTEXPLORE.com
  • %WINDIR%\LSASS.exe
  • %WINDIR%\EXERT.exe
  • %CommonProgramFiles%\INTEXPLORE.pif
Miscellaneous:
Searches for the following windows:
  • ClassName: 'MS_WINHELP' WindowName: ''
  • ClassName: '' WindowName: '53589793238462643383279'
  • ClassName: '' WindowName: 'ifyoudothatagainiwillkickyourass.xyq'
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