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Win32.HLLW.Autoruner.48816

Added to the Dr.Web virus database: 2012-09-11

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Windows Application' = '<SYSTEM32>.exe'
Creates or modifies the following files:
  • %WINDIR%\Tasks\At1.job
Creates the following services:
  • [<HKLM>\SYSTEM\ControlSet001\Services\RLN06523] 'Start' = '00000002'
Creates the following files on removable media:
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\Sys.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\Drv12\svchost.exe' = '%WINDIR%\Drv12\svchost.exe:*:Enabled:msnmsg'
Creates and executes the following:
  • %WINDIR%\Drv12\svchost.exe
  • %TEMP%\md.exe
  • %TEMP%\output.exe
Executes the following:
  • <SYSTEM32>\rundll32.exe <SYSTEM32>\shimgvw.dll,ImageView_Fullscreen %TEMP%\Image.jpg
Sets a new unauthorized home page for Windows Internet Explorer.
Modifies file system :
Creates the following files:
  • C:\Sys.exe
  • %WINDIR%\winsystem32.exe
  • %WINDIR%\TDTMP
  • C:\autorun.inf
  • %WINDIR%\Drv12\svchost.exe
  • %TEMP%\Image.jpg
  • %TEMP%\output.exe
  • %WINDIR%\RLT6987\services.exe
  • %TEMP%\md.exe
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\Sys.exe
  • <Drive name for removable media>:\autorun.inf
  • C:\Sys.exe
  • C:\autorun.inf
Deletes the following files:
  • %TEMP%\md.exe
Miscellaneous:
Searches for the following windows:
  • ClassName: 'MS_WINHELP' WindowName: ''
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: 'ShImgVw:CPreviewWnd' WindowName: ''