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Win32.HLLW.Autoruner1.64110

Added to the Dr.Web virus database: 2013-12-22

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '8a13bf13e381d1f7d84bf1db16c642bd' = '"%APPDATA%\skype.exe" ..'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] '8a13bf13e381d1f7d84bf1db16c642bd' = '"%APPDATA%\skype.exe" ..'
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\8a13bf13e381d1f7d84bf1db16c642bd.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\skype.exe' = '%APPDATA%\skype.exe:*:Enabled:skype.exe'
Creates and executes the following:
  • '%APPDATA%\skype.exe'
Executes the following:
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%APPDATA%\skype.exe" "skype.exe" ENABLE
Modifies file system :
Creates the following files:
  • %APPDATA%\skype.exe
Network activity:
Connects to:
  • 'ah#####902.zapto.org':5552
UDP:
  • DNS ASK ah#####902.zapto.org
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Indicator' WindowName: '(null)'