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Trojan.MulDrop11.54692

Added to the Dr.Web virus database: 2020-04-09

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
Modifies file system
Creates the following files
  • C:\instsnd\macsound\asterik.wav
  • %WINDIR%\media\macsnd\set20a0.tmp
  • %WINDIR%\media\macsnd\set2070.tmp
  • %WINDIR%\media\macsnd\set205f.tmp
  • %WINDIR%\media\macsnd\set203f.tmp
  • %WINDIR%\media\macsnd\set202f.tmp
  • %WINDIR%\media\macsnd\set200e.tmp
  • %WINDIR%\media\macsnd\set1fee.tmp
  • %WINDIR%\media\macsnd\set1fce.tmp
  • %WINDIR%\media\macsnd\set1fbd.tmp
  • %WINDIR%\media\macsnd\set1f9d.tmp
  • %WINDIR%\media\macsnd\set1f7d.tmp
  • %WINDIR%\media\macsnd\set1f5c.tmp
  • %WINDIR%\media\macsnd\set1f4c.tmp
  • %WINDIR%\media\macsnd\set1f2c.tmp
  • %WINDIR%\media\macsnd\set1f0b.tmp
  • %WINDIR%\media\macsnd\set1eeb.tmp
  • %WINDIR%\media\macsnd\set1ecb.tmp
  • %WINDIR%\media\macsnd\set20df.tmp
  • %WINDIR%\media\macsnd\set2100.tmp
  • %WINDIR%\media\macsnd\set2110.tmp
  • %WINDIR%\media\macsnd\set2131.tmp
  • %WINDIR%\media\macsnd\set2346.tmp
  • %WINDIR%\media\macsnd\set2336.tmp
  • %WINDIR%\media\macsnd\set2315.tmp
  • %WINDIR%\media\macsnd\set22f5.tmp
  • %WINDIR%\media\macsnd\set22d5.tmp
  • %WINDIR%\media\macsnd\set22b5.tmp
  • %WINDIR%\media\macsnd\set22a4.tmp
  • %WINDIR%\media\macsnd\set2284.tmp
  • %WINDIR%\media\macsnd\set2243.tmp
  • %WINDIR%\media\macsnd\set2263.tmp
  • %WINDIR%\media\macsnd\set2233.tmp
  • %WINDIR%\media\macsnd\set2212.tmp
  • %WINDIR%\media\macsnd\set21e2.tmp
  • %WINDIR%\media\macsnd\set21c2.tmp
  • %WINDIR%\media\macsnd\set21a2.tmp
  • %WINDIR%\media\macsnd\set2191.tmp
  • %WINDIR%\media\macsnd\set2171.tmp
  • %WINDIR%\media\macsnd\set2151.tmp
  • %WINDIR%\media\macsnd\set2366.tmp
  • C:\instsnd\del.bat
  • C:\instsnd\macsound\windows xp start.wav
  • C:\instsnd\macsound\windows exit.wav
  • C:\instsnd\macsound\macsound.inf
  • C:\instsnd\macsound\low battery.wav
  • C:\instsnd\macsound\logon.wav
  • C:\instsnd\macsound\logoff.wav
  • C:\instsnd\macsound\exit windows.wav
  • C:\instsnd\macsound\exclamation.wav
  • C:\instsnd\macsound\error.wav
  • C:\instsnd\macsound\empty recycle.wav
  • C:\instsnd\macsound\device failed.wav
  • C:\instsnd\macsound\device disconnect.wav
  • C:\instsnd\macsound\device connect.wav
  • C:\instsnd\macsound\default beep.wav
  • C:\instsnd\macsound\critical stop.wav
  • C:\instsnd\macsound\critical battery.wav
  • C:\instsnd\macsound\contact online.wav
  • C:\instsnd\macsound\complete navigation.wav
  • C:\instsnd\macsound\close.wav
  • C:\instsnd\macsound\maximize.wav
  • C:\instsnd\macsound\menu command.wav
  • C:\instsnd\macsound\menu popup.wav
  • C:\instsnd\macsound\minimize.wav
  • C:\instsnd\macsound\start windows.wav
  • C:\instsnd\macsound\start navigation.wav
  • C:\instsnd\macsound\show toolbar.wav
  • C:\instsnd\macsound\select.wav
  • C:\instsnd\macsound\restore up.wav
  • C:\instsnd\macsound\restore down.wav
  • C:\instsnd\macsound\receive request.wav
  • C:\instsnd\macsound\receive call.wav
  • C:\instsnd\macsound\program error.wav
  • C:\instsnd\macsound\question.wav
  • C:\instsnd\macsound\print complete.wav
  • C:\instsnd\macsound\person leave.wav
  • C:\instsnd\macsound\person join.wav
  • C:\instsnd\macsound\open.wav
  • C:\instsnd\macsound\new messages.wav
  • C:\instsnd\macsound\new mail.wav
  • C:\instsnd\macsound\new alert.wav
  • C:\instsnd\macsound\move menu.wav
  • C:\instsnd\macsound\system notifi.wav
  • %WINDIR%\inf\set2387.tmp
Moves the following files
  • from %WINDIR%\media\macsnd\set1ecb.tmp to %WINDIR%\media\macsnd\asterik.wav
  • from %WINDIR%\media\macsnd\set2171.tmp to %WINDIR%\media\macsnd\new alert.wav
  • from %WINDIR%\media\macsnd\set2191.tmp to %WINDIR%\media\macsnd\new mail.wav
  • from %WINDIR%\media\macsnd\set21a2.tmp to %WINDIR%\media\macsnd\new messages.wav
  • from %WINDIR%\media\macsnd\set21c2.tmp to %WINDIR%\media\macsnd\open.wav
  • from %WINDIR%\media\macsnd\set21e2.tmp to %WINDIR%\media\macsnd\person join.wav
  • from %WINDIR%\media\macsnd\set2212.tmp to %WINDIR%\media\macsnd\person leave.wav
  • from %WINDIR%\media\macsnd\set2233.tmp to %WINDIR%\media\macsnd\print complete.wav
  • from %WINDIR%\media\macsnd\set2243.tmp to %WINDIR%\media\macsnd\program error.wav
  • from %WINDIR%\media\macsnd\set2263.tmp to %WINDIR%\media\macsnd\question.wav
  • from %WINDIR%\media\macsnd\set2284.tmp to %WINDIR%\media\macsnd\receive call.wav
  • from %WINDIR%\media\macsnd\set22a4.tmp to %WINDIR%\media\macsnd\receive request.wav
  • from %WINDIR%\media\macsnd\set22b5.tmp to %WINDIR%\media\macsnd\restore down.wav
  • from %WINDIR%\media\macsnd\set22d5.tmp to %WINDIR%\media\macsnd\restore up.wav
  • from %WINDIR%\media\macsnd\set22f5.tmp to %WINDIR%\media\macsnd\select.wav
  • from %WINDIR%\media\macsnd\set2315.tmp to %WINDIR%\media\macsnd\show toolbar.wav
  • from %WINDIR%\media\macsnd\set2336.tmp to %WINDIR%\media\macsnd\start navigation.wav
  • from %WINDIR%\media\macsnd\set2346.tmp to %WINDIR%\media\macsnd\windows xp start.wav
  • from %WINDIR%\media\macsnd\set2151.tmp to %WINDIR%\media\macsnd\move menu.wav
  • from %WINDIR%\media\macsnd\set2366.tmp to %WINDIR%\media\macsnd\system notifi.wav
  • from %WINDIR%\media\macsnd\set2131.tmp to %WINDIR%\media\macsnd\minimize.wav
  • from %WINDIR%\media\macsnd\set2100.tmp to %WINDIR%\media\macsnd\menu command.wav
  • from %WINDIR%\media\macsnd\set1eeb.tmp to %WINDIR%\media\macsnd\close.wav
  • from %WINDIR%\media\macsnd\set1f0b.tmp to %WINDIR%\media\macsnd\complete navigation.wav
  • from %WINDIR%\media\macsnd\set1f2c.tmp to %WINDIR%\media\macsnd\contact online.wav
  • from %WINDIR%\media\macsnd\set1f4c.tmp to %WINDIR%\media\macsnd\critical battery.wav
  • from %WINDIR%\media\macsnd\set1f5c.tmp to %WINDIR%\media\macsnd\critical stop.wav
  • from %WINDIR%\media\macsnd\set1f7d.tmp to %WINDIR%\media\macsnd\default beep.wav
  • from %WINDIR%\media\macsnd\set1f9d.tmp to %WINDIR%\media\macsnd\device connect.wav
  • from %WINDIR%\media\macsnd\set1fbd.tmp to %WINDIR%\media\macsnd\device disconnect.wav
  • from %WINDIR%\media\macsnd\set1fce.tmp to %WINDIR%\media\macsnd\device failed.wav
  • from %WINDIR%\media\macsnd\set1fee.tmp to %WINDIR%\media\macsnd\empty recycle.wav
  • from %WINDIR%\media\macsnd\set200e.tmp to %WINDIR%\media\macsnd\error.wav
  • from %WINDIR%\media\macsnd\set202f.tmp to %WINDIR%\media\macsnd\exclamation.wav
  • from %WINDIR%\media\macsnd\set203f.tmp to %WINDIR%\media\macsnd\windows exit.wav
  • from %WINDIR%\media\macsnd\set205f.tmp to %WINDIR%\media\macsnd\logoff.wav
  • from %WINDIR%\media\macsnd\set2070.tmp to %WINDIR%\media\macsnd\logon.wav
  • from %WINDIR%\media\macsnd\set20a0.tmp to %WINDIR%\media\macsnd\low battery.wav
  • from %WINDIR%\media\macsnd\set20df.tmp to %WINDIR%\media\macsnd\maximize.wav
  • from %WINDIR%\media\macsnd\set2110.tmp to %WINDIR%\media\macsnd\menu popup.wav
  • from %WINDIR%\inf\set2387.tmp to %WINDIR%\inf\macsound.inf
Miscellaneous
Searches for the following windows
  • ClassName: 'EDIT' WindowName: ''
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /Q /C RUNDLL32.EXE SETUPAPI.DLL,InstallHinfSection DefaultInstall 128 C:\instsnd\MACSound\MACSound.inf
  • '%WINDIR%\syswow64\rundll32.exe' SETUPAPI.DLL,InstallHinfSection DefaultInstall 128 C:\instsnd\MACSound\MACSound.inf
  • '%WINDIR%\syswow64\runonce.exe' -r
  • '%WINDIR%\syswow64\grpconv.exe' -o

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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  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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