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Trojan.MulDrop4.7855

Added to the Dr.Web virus database: 2012-10-25

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Classes\TextBrush\Shell\Open\Command] '' = '"%TEMP%\esy2write.exe" "%1"'
Creates or modifies the following files:
  • %HOMEPATH%\Start Menu\Programs\Startup\server.exe
Malicious functions:
Creates and executes the following:
  • '%TEMP%\esy2write.exe'
  • '%TEMP%\server.exe'
Modifies file system :
Creates the following files:
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Purple Stunner.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Peach Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Lime - 270.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Pink - Large.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Lime.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Overlap Purples.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Impress Large.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Impress Large II.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Impression.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Love Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Lemon Yellow.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Pink Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Vertical Love.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Super Bold.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Warm Orange - Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\Image Tools\Text Effects.EXE
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Warm Orange.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Super Bold - 90.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Pink Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Soft Pink Small - 90.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Stylish Aqua.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Summers Warmth Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Summers Warmth Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Ice - Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Australian Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Australian Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Backward Warm Orange.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Bold Print.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Bold Print Shadow.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Australian Large.tbh
  • %TEMP%\server.exe
  • %TEMP%\aut1.tmp
  • %TEMP%\aut2.tmp
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Australian Backward Large.tbh
  • %TEMP%\esy2write.exe
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Comic Pink Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Dutch Silver II.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Dutch Gold.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Dutch Silver.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Ice - Large.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Ghost.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Deep Purple.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Comic Soft Pink Medium.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Comic Pink Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Comic Soft Pink Small.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Deep Purple - 180.tbh
  • %HOMEPATH%\Start Menu\Programs\Blaiz Enterprises\TextBrushs\Courier Attention.tbh
Deletes the following files:
  • %TEMP%\aut2.tmp
  • %TEMP%\aut1.tmp
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'

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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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.

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