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Win32.HLLW.Brutus.77

Added to the Dr.Web virus database: 2012-10-26

Virus description added:

Technical Information

To ensure autorun and distribution:
Substitutes the following executable system files:
  • <SYSTEM32>\cmd.exe with <SYSTEM32>\cmd.exe.new
  • <SYSTEM32>\dllcache\rundll32.exe with <SYSTEM32>\dllcache\rundll32.exe.new
  • <SYSTEM32>\rundll32.exe with <SYSTEM32>\rundll32.exe.new
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<Full path to virus>' = '<Full path to virus>:*:Enabled:ipsec'
To complicate detection of its presence in the operating system,
blocks the following features:
  • User Account Control (UAC)
Executes the following:
  • <SYSTEM32>\telnet.exe
  • <SYSTEM32>\notepad.exe
Injects code into
the following system processes:
  • <SYSTEM32>\notepad.exe
a large number of user processes.