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Trojan.MulDrop2.55114

Added to the Dr.Web virus database: 2011-08-06

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\backup.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:
  • C:\Far\Plugins\ascii\backup.exe C:\Far\Plugins\ascii\
  • %ALLUSERSPROFILE%\Start Menu\Programs\backup.exe %ALLUSERSPROFILE%\Start Menu\Programs\
  • C:\Far\PlugDoc\Headers.pas\backup.exe C:\Far\PlugDoc\Headers.pas\
  • %PROGRAM_FILES%\FireFox\backup.exe %PROGRAM_FILES%\FireFox\
  • %WINDIR%\data.exe %WINDIR%\
  • C:\Far\Addons\XLat\backup.exe C:\Far\Addons\XLat\
  • %PROGRAM_FILES%\FireFox\chrome\backup.exe %PROGRAM_FILES%\FireFox\chrome\
  • %CommonProgramFiles%\Microsoft Shared\DW\update.exe %CommonProgramFiles%\Microsoft Shared\DW\
  • C:\Far\Addons\Tables\Central European\backup.exe C:\Far\Addons\Tables\Central European\
  • %CommonProgramFiles%\MSSoap\Binaries\backup.exe %CommonProgramFiles%\MSSoap\Binaries\
  • %ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\backup.exe %ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\
  • %ALLUSERSPROFILE%\Start Menu\backup.exe %ALLUSERSPROFILE%\Start Menu\
  • C:\Far\PlugDoc\Headers.c\backup.exe C:\Far\PlugDoc\Headers.c\
  • %PROGRAM_FILES%\ComPlus Applications\backup.exe %PROGRAM_FILES%\ComPlus Applications\
  • C:\Far\PlugDoc\Examples\Compare\backup.exe C:\Far\PlugDoc\Examples\Compare\
  • C:\Far\Plugins\backup.exe C:\Far\Plugins\
  • C:\Far\PlugDoc\Examples\Editor\backup.exe C:\Far\PlugDoc\Examples\Editor\
  • %CommonProgramFiles%\Microsoft Shared\DAO\backup.exe %CommonProgramFiles%\Microsoft Shared\DAO\
  • %ALLUSERSPROFILE%\Documents\My Videos\System Restore.exe %ALLUSERSPROFILE%\Documents\My Videos\
  • C:\Far\Addons\Tables\backup.exe C:\Far\Addons\Tables\
  • %CommonProgramFiles%\MSSoap\backup.exe %CommonProgramFiles%\MSSoap\
  • C:\Far\PlugDoc\Examples\Editor\Align\backup.exe C:\Far\PlugDoc\Examples\Editor\Align\
  • %ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\backup.exe %ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\
  • C:\Far\PlugDoc\Examples\Editor\AutoWrap\backup.exe C:\Far\PlugDoc\Examples\Editor\AutoWrap\
  • %CommonProgramFiles%\Services\backup.exe %CommonProgramFiles%\Services\
  • %CommonProgramFiles%\Microsoft Shared\DW\1025\backup.exe %CommonProgramFiles%\Microsoft Shared\DW\1025\
  • %PROGRAM_FILES%\FireFox\components\update.exe %PROGRAM_FILES%\FireFox\components\
  • %CommonProgramFiles%\ODBC\Data Sources\backup.exe %CommonProgramFiles%\ODBC\Data Sources\
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\backup.exe %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\
  • %PROGRAM_FILES%\FireFox\chrome\browser\backup.exe %PROGRAM_FILES%\FireFox\chrome\browser\
  • C:\Far\Addons\XLat\Russian\backup.exe C:\Far\Addons\XLat\Russian\
  • C:\Far\Addons\Tables\Hebrew\backup.exe C:\Far\Addons\Tables\Hebrew\
  • %WINDIR%\AppPatch\backup.exe %WINDIR%\AppPatch\
  • C:\Far\Plugins\ascii\src\backup.exe C:\Far\Plugins\ascii\src\
  • C:\Far\Addons\Tables\Cyrillic\backup.exe C:\Far\Addons\Tables\Cyrillic\
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\backup.exe %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\
  • %WINDIR%\addins\backup.exe %WINDIR%\addins\
  • %CommonProgramFiles%\ODBC\backup.exe %CommonProgramFiles%\ODBC\
  • %CommonProgramFiles%\MSSoap\Binaries\Resources\backup.exe %CommonProgramFiles%\MSSoap\Binaries\Resources\
  • %CommonProgramFiles%\Microsoft Shared\MSInfo\backup.exe %CommonProgramFiles%\Microsoft Shared\MSInfo\
  • C:\Far\Plugins\backup\backup.exe C:\Far\Plugins\backup\
  • %PROGRAM_FILES%\Internet Explorer\backup.exe %PROGRAM_FILES%\Internet Explorer\
  • C:\Far\PlugDoc\Examples\FARCmds\backup.exe C:\Far\PlugDoc\Examples\FARCmds\
  • %HOMEPATH%\Start Menu\Programs\Accessories\Accessibility\update.exe %HOMEPATH%\Start Menu\Programs\Accessories\Accessibility\
  • %HOMEPATH%\Start Menu\Programs\Accessories\Entertainment\update.exe %HOMEPATH%\Start Menu\Programs\Accessories\Entertainment\
  • %HOMEPATH%\Start Menu\Programs\Accessories\backup.exe %HOMEPATH%\Start Menu\Programs\Accessories\
  • %HOMEPATH%\Start Menu\backup.exe %HOMEPATH%\Start Menu\
  • %HOMEPATH%\Start Menu\Programs\backup.exe %HOMEPATH%\Start Menu\Programs\
  • %ALLUSERSPROFILE%\data.exe %ALLUSERSPROFILE%\
  • C:\Far\Addons\backup.exe C:\Far\Addons\
  • %HOMEPATH%\Start Menu\Programs\Startup\backup.exe %HOMEPATH%\Start Menu\Programs\Startup\
  • %HOMEPATH%\Start Menu\Programs\Administrative Tools\backup.exe %HOMEPATH%\Start Menu\Programs\Administrative Tools\
  • C:\Far\backup.exe C:\Far\
  • %HOMEPATH%\My Documents\My Pictures\backup.exe %HOMEPATH%\My Documents\My Pictures\
  • %HOMEPATH%\Cookies\backup.exe %HOMEPATH%\Cookies\
  • %HOMEPATH%\Desktop\backup.exe %HOMEPATH%\Desktop\
  • %HOMEPATH%\backup.exe %HOMEPATH%\
  • C:\backup.exe \
  • C:\Documents and Settings\backup.exe C:\Documents and Settings\
  • %HOMEPATH%\My Documents\Downloads\backup.exe %HOMEPATH%\My Documents\Downloads\
  • %HOMEPATH%\My Documents\My Music\backup.exe %HOMEPATH%\My Documents\My Music\
  • %HOMEPATH%\My Documents\backup.exe %HOMEPATH%\My Documents\
  • %HOMEPATH%\Favorites\backup.exe %HOMEPATH%\Favorites\
  • %HOMEPATH%\Favorites\Links\backup.exe %HOMEPATH%\Favorites\Links\
  • %ALLUSERSPROFILE%\Desktop\backup.exe %ALLUSERSPROFILE%\Desktop\
  • %CommonProgramFiles%\backup.exe %CommonProgramFiles%\
  • C:\Far\Addons\SetUp\backup.exe C:\Far\Addons\SetUp\
  • C:\Far\PlugDoc\Examples\backup.exe C:\Far\PlugDoc\Examples\
  • C:\Far\Addons\Macros\backup.exe C:\Far\Addons\Macros\
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\update.exe %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\
  • %CommonProgramFiles%\Microsoft Shared\backup.exe %CommonProgramFiles%\Microsoft Shared\
  • %ALLUSERSPROFILE%\Documents\My Pictures\backup.exe %ALLUSERSPROFILE%\Documents\My Pictures\
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\000D7521\backup.exe %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\000D7521\
  • %ALLUSERSPROFILE%\Favorites\backup.exe %ALLUSERSPROFILE%\Favorites\
  • C:\Far\Addons\Shell\backup.exe C:\Far\Addons\Shell\
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Music\backup.exe %ALLUSERSPROFILE%\Documents\My Music\Sample Music\
  • %ALLUSERSPROFILE%\Documents\My Music\backup.exe %ALLUSERSPROFILE%\Documents\My Music\
  • C:\Far\Addons\Colors\Custom Highlighting\update.exe C:\Far\Addons\Colors\Custom Highlighting\
  • C:\Far\Addons\Colors\backup.exe C:\Far\Addons\Colors\
  • C:\Far\Addons\Archivers\backup.exe C:\Far\Addons\Archivers\
  • %ALLUSERSPROFILE%\Documents\backup.exe %ALLUSERSPROFILE%\Documents\
  • C:\Far\PlugDoc\backup.exe C:\Far\PlugDoc\
  • %PROGRAM_FILES%\backup.exe %PROGRAM_FILES%\
  • <Auxiliary element> <Auxiliary element>
  • C:\Far\Addons\Colors\Default Highlighting\backup.exe C:\Far\Addons\Colors\Default Highlighting\
  • %ALLUSERSPROFILE%\Documents\My Music\My Playlists\System Restore.exe %ALLUSERSPROFILE%\Documents\My Music\My Playlists\
Modifies settings of Windows Explorer:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer] 'NoFolderOptions' = '00000001'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
Hides the following processes:
  • C:\Far\Addons\XLat\Russian\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\backup.exe
  • %CommonProgramFiles%\ODBC\Data Sources\backup.exe
  • %PROGRAM_FILES%\FireFox\chrome\browser\backup.exe
  • C:\Far\Addons\Tables\Hebrew\backup.exe
Modifies file system :
Creates the following files:
  • C:\Far\PlugDoc\Headers.pas\backup.exe
  • C:\Far\Addons\Tables\Central European\backup.exe
  • %WINDIR%\data.exe
  • %PROGRAM_FILES%\FireFox\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\backup.exe
  • %CommonProgramFiles%\MSSoap\Binaries\backup.exe
  • %WINDIR%\addins\backup.exe
  • C:\Far\Addons\XLat\backup.exe
  • %PROGRAM_FILES%\FireFox\chrome\backup.exe
  • C:\Far\PlugDoc\Examples\Editor\Align\backup.exe
  • %CommonProgramFiles%\Microsoft Shared\DW\update.exe
  • C:\Far\Plugins\ascii\backup.exe
  • C:\Far\PlugDoc\Headers.c\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\backup.exe
  • %PROGRAM_FILES%\ComPlus Applications\backup.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\backup.exe
  • C:\Far\Plugins\backup.exe
  • C:\Far\Addons\Tables\backup.exe
  • C:\Far\PlugDoc\Examples\Editor\backup.exe
  • %ALLUSERSPROFILE%\Documents\My Videos\System Restore.exe
  • %ALLUSERSPROFILE%\Documents\My Pictures\Sample Pictures\backup.exe
  • %CommonProgramFiles%\MSSoap\backup.exe
  • %CommonProgramFiles%\Microsoft Shared\DAO\backup.exe
  • %CommonProgramFiles%\Services\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Administrative Tools\backup.exe
  • C:\Far\PlugDoc\Examples\Editor\AutoWrap\backup.exe
  • %PROGRAM_FILES%\FireFox\chrome\browser\backup.exe
  • %WINDIR%\AppPatch\backup.exe
  • %CommonProgramFiles%\ODBC\Data Sources\backup.exe
  • %PROGRAM_FILES%\Internet Explorer\Connection Wizard\backup.exe
  • C:\Far\PlugDoc\Examples\FileCase\System Restore.exe
  • C:\Far\Addons\Tables\Cyrillic\E-Mail Double Conversion\backup.exe
  • C:\Far\Addons\Tables\Hebrew\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\Accessibility\backup.exe
  • %PROGRAM_FILES%\FireFox\components\update.exe
  • C:\Far\Addons\Tables\Cyrillic\backup.exe
  • %CommonProgramFiles%\MSSoap\Binaries\Resources\backup.exe
  • %CommonProgramFiles%\ODBC\backup.exe
  • %ALLUSERSPROFILE%\Start Menu\Programs\Accessories\backup.exe
  • C:\Far\Plugins\ascii\src\backup.exe
  • C:\Far\PlugDoc\Examples\FARCmds\backup.exe
  • C:\Far\Addons\XLat\Russian\backup.exe
  • %CommonProgramFiles%\Microsoft Shared\MSInfo\backup.exe
  • C:\Far\Plugins\backup\backup.exe
  • %PROGRAM_FILES%\Internet Explorer\backup.exe
  • %CommonProgramFiles%\Microsoft Shared\DW\1025\backup.exe
  • C:\Far\PlugDoc\Examples\Compare\backup.exe
  • <Current directory>\<Virus name>.zip
  • %HOMEPATH%\Start Menu\backup.exe
  • %HOMEPATH%\My Documents\My Pictures\backup.exe
  • %HOMEPATH%\My Documents\Downloads\backup.exe
  • %HOMEPATH%\My Documents\My Music\backup.exe
  • %HOMEPATH%\Start Menu\Programs\backup.exe
  • %HOMEPATH%\Start Menu\Programs\Administrative Tools\backup.exe
  • C:\Far\backup.exe
  • %HOMEPATH%\Start Menu\Programs\Accessories\Entertainment\update.exe
  • %HOMEPATH%\Start Menu\Programs\Accessories\backup.exe
  • %HOMEPATH%\Start Menu\Programs\Accessories\Accessibility\update.exe
  • %HOMEPATH%\My Documents\backup.exe
  • <Current directory>\<Virus name>.dat
  • C:\backup.exe
  • <Current directory>\T1a02804
  • <Current directory>\backup.exe
  • <Current directory>\temp.zip
  • C:\Documents and Settings\backup.exe
  • %HOMEPATH%\Favorites\backup.exe
  • %HOMEPATH%\Favorites\Links\backup.exe
  • %HOMEPATH%\Desktop\backup.exe
  • %HOMEPATH%\backup.exe
  • %HOMEPATH%\Cookies\backup.exe
  • C:\Far\PlugDoc\Examples\backup.exe
  • %CommonProgramFiles%\backup.exe
  • %PROGRAM_FILES%\backup.exe
  • C:\Far\Addons\Macros\backup.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Music\backup.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\update.exe
  • C:\Far\Addons\Shell\backup.exe
  • %CommonProgramFiles%\Microsoft Shared\backup.exe
  • %ALLUSERSPROFILE%\Documents\My Music\Sample Playlists\000D7521\backup.exe
  • C:\Far\Addons\SetUp\backup.exe
  • %ALLUSERSPROFILE%\Favorites\backup.exe
  • C:\Far\PlugDoc\backup.exe
  • C:\Far\Addons\Archivers\backup.exe
  • C:\Far\Addons\Colors\backup.exe
  • %ALLUSERSPROFILE%\Desktop\backup.exe
  • C:\Far\Addons\backup.exe
  • %ALLUSERSPROFILE%\data.exe
  • %ALLUSERSPROFILE%\Documents\backup.exe
  • C:\Far\Addons\Colors\Default Highlighting\backup.exe
  • <Auxiliary element>
  • %ALLUSERSPROFILE%\Documents\My Music\My Playlists\System Restore.exe
  • %ALLUSERSPROFILE%\Documents\My Music\backup.exe
  • C:\Far\Addons\Colors\Custom Highlighting\update.exe
Sets the 'hidden' attribute to the following files:
  • <Current directory>\<Virus name>.zip
  • <Current directory>\temp.zip
Deletes the following files:
  • <Current directory>\<Virus name>.dat
  • <Current directory>\temp.zip
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: 'ExploreWClass' WindowName: ''
  • ClassName: 'CabinetWClass' WindowName: ''

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.

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  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