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Trojan.MulDrop4.8763

Added to the Dr.Web virus database: 2012-10-29

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'shell' = 'Explorer.exe winlogons.exe'
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\Startup.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
  • file extensions
Creates and executes the following:
  • %WINDIR%\d\svchost2.exe
  • %WINDIR%\c\svchost1.exe
  • %WINDIR%\wins\svchost.exe
Modifies file system :
Creates the following files:
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Media Player\Media Player.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\SystemCertificates.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Internet Explorer\Internet Explorer.exe
  • C:\Documents and Settings\Default User\Application Data\Application Data.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Microsoft.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\CTLs\CTLs.exe
  • C:\Documents and Settings\Default User\Cookies\Cookies.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\CRLs\CRLs.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\My.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\Certificates\Certificates.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Communications.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Entertainment\Entertainment.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\Accessibility.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Programs.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessories.exe
  • %ALLUSERSPROFILE%\Templates\Templates.exe
  • C:\Documents and Settings\Default User\Default User.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Games\Games.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\System Tools.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Administrative Tools.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\2VAZY7AN\2VAZY7AN.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\KHMHGZ4F.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\Content.IE5.exe
  • C:\Documents and Settings\Default User\Local Settings\Temp\Temp.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Temporary Internet Files.exe
  • C:\Documents and Settings\Default User\NetHood\NetHood.exe
  • C:\Documents and Settings\Default User\PrintHood\PrintHood.exe
  • C:\Documents and Settings\Default User\My Documents\My Documents.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\U98D4X8H\U98D4X8H.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\YPORKZYZ\YPORKZYZ.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Application Data.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Microsoft.exe
  • C:\Documents and Settings\Default User\Local Settings\Local Settings.exe
  • C:\Documents and Settings\Default User\Desktop\Desktop.exe
  • C:\Documents and Settings\Default User\Favorites\Favorites.exe
  • C:\Documents and Settings\Default User\Local Settings\History\History.exe
  • C:\Documents and Settings\Default User\Local Settings\History\History.IE5\History.IE5.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\9.0.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Media Player\Media Player.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\Windows Media.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\DSS\MachineKeys\MachineKeys.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\RSA.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\DSS\DSS.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Microsoft.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\Crypto.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\HTML Help\HTML Help.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Media Index\Media Index.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Dr Watson\Dr Watson.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\MachineKeys\MachineKeys.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-18\S-1-5-18.exe
  • %WINDIR%\e\svchost3.exe
  • %WINDIR%\f\svchost4.exe
  • %WINDIR%\d\svchost2.exe
  • %WINDIR%\winlogons.exe
  • %WINDIR%\c\svchost1.exe
  • %ALLUSERSPROFILE%\All Users.exe
  • %ALLUSERSPROFILE%\Application Data\Application Data.exe
  • %WINDIR%\wins\svchost.exe
  • %WINDIR%\g\svchost5.exe
  • %WINDIR%\h\svchost6.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\0338E140.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\My Pictures.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\Sample Playlists.exe
  • %ALLUSERSPROFILE%\Documents\My Music\My Playlists\My Playlists.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Music\Sample Music.exe
  • %ALLUSERSPROFILE%\Favorites\Favorites.exe
  • %ALLUSERSPROFILE%\Start Menu\Start Menu.exe
  • %ALLUSERSPROFILE%\DRM\DRM.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Sample Pictures.exe
  • %ALLUSERSPROFILE%\Documents\My Videos\My Videos.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Cm\Cm.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Pbk\Pbk.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Connections.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Media Player\Media Player.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Network.exe
  • %ALLUSERSPROFILE%\Documents\Documents.exe
  • %ALLUSERSPROFILE%\Documents\My Music\My Music.exe
  • %ALLUSERSPROFILE%\Desktop\Desktop.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\User Account Pictures.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\Default Pictures.exe
Sets the 'hidden' attribute to the following files:
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\My.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\Certificates\Certificates.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Media Player\Media Player.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\SystemCertificates.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\CRLs\CRLs.exe
  • C:\Documents and Settings\Default User\Desktop\Desktop.exe
  • C:\Documents and Settings\Default User\Favorites\Favorites.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\SystemCertificates\My\CTLs\CTLs.exe
  • C:\Documents and Settings\Default User\Cookies\Cookies.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Games\Games.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\Startup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\System Tools\System Tools.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\Administrative Tools.exe
  • %ALLUSERSPROFILE%\Templates\Templates.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Microsoft.exe
  • C:\Documents and Settings\Default User\Application Data\Microsoft\Internet Explorer\Internet Explorer.exe
  • C:\Documents and Settings\Default User\Default User.exe
  • C:\Documents and Settings\Default User\Application Data\Application Data.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\2VAZY7AN\2VAZY7AN.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\KHMHGZ4F.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Temporary Internet Files.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\Content.IE5.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\U98D4X8H\U98D4X8H.exe
  • C:\Documents and Settings\Default User\NetHood\NetHood.exe
  • C:\Documents and Settings\Default User\PrintHood\PrintHood.exe
  • C:\Documents and Settings\Default User\Local Settings\Temporary Internet Files\Content.IE5\YPORKZYZ\YPORKZYZ.exe
  • C:\Documents and Settings\Default User\My Documents\My Documents.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Microsoft.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Media Player\Media Player.exe
  • C:\Documents and Settings\Default User\Local Settings\Local Settings.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Application Data.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\Windows Media.exe
  • C:\Documents and Settings\Default User\Local Settings\History\History.IE5\History.IE5.exe
  • C:\Documents and Settings\Default User\Local Settings\Temp\Temp.exe
  • C:\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\9.0.exe
  • C:\Documents and Settings\Default User\Local Settings\History\History.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Entertainment\Entertainment.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Media Index\Media Index.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Media Player\Media Player.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Dr Watson\Dr Watson.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\HTML Help\HTML Help.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Network.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Pbk\Pbk.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\User Account Pictures.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Connections.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Network\Connections\Cm\Cm.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Microsoft.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\Crypto.exe
  • %ALLUSERSPROFILE%\All Users.exe
  • %ALLUSERSPROFILE%\Application Data\Application Data.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\DSS\DSS.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\MachineKeys\MachineKeys.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\S-1-5-18\S-1-5-18.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\DSS\MachineKeys\MachineKeys.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\Crypto\RSA\RSA.exe
  • %ALLUSERSPROFILE%\DRM\DRM.exe
  • %ALLUSERSPROFILE%\Favorites\Favorites.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\Sample Pictures.exe
  • %ALLUSERSPROFILE%\Documents\My Videos\My Videos.exe
  • %ALLUSERSPROFILE%\Start Menu\Start Menu.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\Accessibility.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Communications\Communications.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Programs.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessories.exe
  • %ALLUSERSPROFILE%\Documents\Documents.exe
  • %ALLUSERSPROFILE%\Documents\My Music\My Music.exe
  • %ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\Default Pictures.exe
  • %ALLUSERSPROFILE%\Desktop\Desktop.exe
  • %ALLUSERSPROFILE%\Documents\My Music\My Playlists\My Playlists.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\0338E140\0338E140.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\My Pictures.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Music\Sample Music.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\Sample Playlists.exe

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android