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Win32.HLLW.Autoruner1.8301

Added to the Dr.Web virus database: 2011-12-20

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'System Lsass' = '%WINDIR%\lsass.exe'
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\Startup.exe
Creates the following files on removable media:
  • <Drive name for removable media>:\Autorun.exe
  • <Drive name for removable media>:\Autorun.inf
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
Modifies settings of Windows Explorer:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer] 'NoFolderOptions' = '00000001'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer] 'NoRun' = '00000001'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer] 'NoFind' = '00000001'
Modifies file system :
Creates the following files:
  • %WINDIR%\lsass.exe
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\Autorun.exe
  • <Drive name for removable media>:\Autorun.inf
  • %WINDIR%\lsass.exe
Miscellaneous:
Searches for the following windows:
  • ClassName: 'ComboBoxEx32' WindowName: ''
  • ClassName: 'ComboBox' WindowName: ''
  • ClassName: 'Edit' WindowName: ''
  • ClassName: 'CabinetWClass' WindowName: ''
  • ClassName: 'WorkerW' WindowName: ''
  • ClassName: 'ReBarWindow32' WindowName: ''