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Win32.HLLW.Autoruner1.13355

Added to the Dr.Web virus database: 2012-03-10

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'System' = '<SYSTEM32>\Setup.exe'
Infects the following executable system files:
  • <SYSTEM32>\taskmgr.exe
  • <SYSTEM32>\setup.exe
Substitutes the following executable system files:
  • <SYSTEM32>\dllcache\setup.exe with <SYSTEM32>\dllcache\setup.exe.new
  • <SYSTEM32>\dllcache\taskmgr.exe with <SYSTEM32>\dllcache\taskmgr.exe.new
  • <SYSTEM32>\setup.exe with <SYSTEM32>\setup.exe.new
  • <SYSTEM32>\taskmgr.exe with <SYSTEM32>\taskmgr.exe.new
Malicious functions:
Executes the following:
  • <SYSTEM32>\logonui.exe /status /shutdown
Attempts to shut down the Windows operating system.
Modifies file system :
Creates the following files:
  • <SYSTEM32>\taskmgr.exe.new
  • <SYSTEM32>\dllcache\setup.exe.new
  • <SYSTEM32>\dllcache\taskmgr.exe.new
  • %TEMP%\aut1.tmp
  • %TEMP%\aut2.tmp
  • <SYSTEM32>\setup.exe.new
Deletes the following files:
  • %TEMP%\aut2.tmp
  • %TEMP%\aut1.tmp
Miscellaneous:
Searches for the following windows:
  • ClassName: 'StatusWindowClass' WindowName: ''
  • ClassName: 'BUTTON' WindowName: ''
  • ClassName: 'Shell_TrayWnd' WindowName: ''