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Profil

Win32.HLLW.Autoruner.51956

Added to the Dr.Web virus database: 2011-06-17

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msconfig.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe,Yotninam.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\regedit.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'USBGuard' = '<SYSTEM32>\Y0tninam.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe,<Virus name>.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe] 'Debugger' = '<DRIVERS>\Yotninam.exe'
Creates the following files on removable media:
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\Yotninam.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
  • file extensions
Creates and executes the following:
  • %WINDIR%\Yotninam.exe 
Executes the following:
  • %WINDIR%\explorer.exe
Modifies settings of Windows Explorer:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFind' = '00000001'
Forces autoplay for removable media.
Modifies file system :
Creates the following files:
  • <DRIVERS>\yotninam.exe
  • <SYSTEM32>\Y0tninam.exe
  • %WINDIR%\msconfig.exe
  • %WINDIR%\Yotninam.exe
  • %WINDIR%\autorun.inf
Sets the 'hidden' attribute to the following files:
  • <SYSTEM32>\Y0tninam.exe
  • %WINDIR%\Yotninam.exe
  • <Drive name for removable media>:\Yotninam.exe
  • %WINDIR%\autorun.inf
  • <Drive name for removable media>:\autorun.inf
Deletes the following files:
  • <Drive name for removable media>:\autorun.inf
Miscellaneous:
Searches for the following windows:
  • ClassName: '' WindowName: ''

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