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Win32.HLLW.Autoruner1.63916

Added to the Dr.Web virus database: 2013-12-21

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '08f4dc96bbb7af09d1a37fe35c75a42f' = '"%TEMP%\explorer.exe" ..'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] '08f4dc96bbb7af09d1a37fe35c75a42f' = '"%TEMP%\explorer.exe" ..'
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\08f4dc96bbb7af09d1a37fe35c75a42f.exe
Creates the following files on removable media:
  • <Drive name for removable media>:\08f4dc96bbb7af09d1a37fe35c75a42f.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\explorer.exe' = '%TEMP%\explorer.exe:*:Enabled:explorer.exe'
Creates and executes the following:
  • '%TEMP%\explorer.exe'
Executes the following:
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\explorer.exe" "explorer.exe" ENABLE
Modifies file system :
Creates the following files:
  • %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new
  • %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new
  • %TEMP%\explorer.exe
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\08f4dc96bbb7af09d1a37fe35c75a42f.exe
Moves the following files:
  • from %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch.new to %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\enterprisesec.config.cch
  • from %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch.new to %WINDIR%\Microsoft.NET\Framework\v2.0.50727\CONFIG\security.config.cch
Network activity:
Connects to:
  • 'po####31.no-ip.org':1177
UDP:
  • DNS ASK po####31.no-ip.org
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Indicator' WindowName: '(null)'