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Win32.HLLW.Autoruner1.176

Added to the Dr.Web virus database: 2011-10-24

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\policies\Explorer\run] 'MeltAndProtect' = '%APPDATA%\MeltAndProtect.exe'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'MeltAndProtect' = '%APPDATA%\MeltAndProtect.exe'
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'MeltAndProtect' = '%APPDATA%\MeltAndProtect.exe'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{DE5E5AAA-CDBA-FB8E-DFC1-76D6FFDAD3D4}] 'StubPath' = '%APPDATA%\MeltAndProtect.exe'
  • [<HKCU>\SOFTWARE\Microsoft\Active Setup\Installed Components\{DE5E5AAA-CDBA-FB8E-DFC1-76D6FFDAD3D4}] 'StubPath' = '%APPDATA%\MeltAndProtect.exe'
Malicious functions
To bypass firewall, removes or modifies the following registry keys
  • [<HKLM>\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
  • [<HKLM>\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<Full path to file>' = '<Full path to file>:*:Enabled:Windows Mess...
  • [<HKLM>\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\MeltAndProtect.exe' = '%APPDATA%\MeltAndProtect.exe:*:En...
Injects code into
the following user processes:
  • vbc.exe
Installs hooks to intercept notifications
on keystrokes:
  • Handler for all processes: <Full path to file>
Modifies file system
Creates the following files
  • %TEMP%\vbc.exe
  • %APPDATA%\meltandprotect.exe
  • %APPDATA%\vcrypt.dat
Network activity
UDP
  • DNS ASK vv#.#o-ip.info
Miscellaneous
Creates and executes the following
  • '%TEMP%\vbc.exe'
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "<Full path to file>" /t REG_SZ /d "<Full path to file>:*...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%APPDATA%\MeltAndProtect.exe" /t REG_SZ /d "%APPDATA%\Me...' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "<Full path to file>" /t REG_SZ /d "<Full path to file>:*...
  • '%WINDIR%\syswow64\cmd.exe' /c REG ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%APPDATA%\MeltAndProtect.exe" /t REG_SZ /d "%APPDATA%\Me...
  • '%WINDIR%\syswow64\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile /v "DoNotAllowExceptions" /t REG_DWORD /d "0" /f
  • '%WINDIR%\syswow64\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "<Full path to file>" /t REG_SZ /d "<Full path to file>:*:Enable...
  • '%WINDIR%\syswow64\reg.exe' ADD HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List /v "%APPDATA%\MeltAndProtect.exe" /t REG_SZ /d "%APPDATA%\MeltAndPr...

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