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Win32.HLLW.Autoruner1.29938

Added to the Dr.Web virus database: 2012-11-19

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates the following files on removable media:
  • <Drive name for removable media>:\asxnhu.pif
  • <Drive name for removable media>:\autorun.inf
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\Explorer.EXE' = '%WINDIR%\Explorer.EXE:*:Enabled:ipsec'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%PROGRAM_FILES%\server.exe\server.exe' = '%PROGRAM_FILES%\server.exe\server.exe:*:Enabled:ipsec'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
blocks the following features:
  • User Account Control (UAC)
  • Windows Security Center
Creates and executes the following:
  • %PROGRAM_FILES%\server.exe\server.exe
Executes the following:
  • <SYSTEM32>\notepad.exe
  • <SYSTEM32>\netsh.exe firewall set opmode disable
Injects code into
the following system processes:
  • <SYSTEM32>\notepad.exe
a large number of user processes.
Modifies file system :
Creates the following files:
  • %TEMP%\winlcjlf.exe
  • %TEMP%\rukj.exe
  • %PROGRAM_FILES%\server.exe\server.exe
  • <DRIVERS>\iesnjn.sys
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\asxnhu.pif
  • <Drive name for removable media>:\autorun.inf
Deletes the following files:
  • %TEMP%\winlcjlf.exe
  • %TEMP%\rukj.exe
  • <DRIVERS>\iesnjn.sys
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: 'EDIT' WindowName: ''