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Trojan.MulDrop5.1213

Added to the Dr.Web virus database: 2013-10-18

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Active Setup\Installed Components\{7Y1NOUB5-7BA6-WXK3-QUJ3-703L5924S72O}] 'StubPath' = '%PROGRAM_FILES%\MSXML 4.0\qpcdqo.exe'
Malicious functions:
Creates and executes the following:
  • '%PROGRAM_FILES%\MSN Messenger\Mctray.exe'
Executes the following:
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\Mctray.exe" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSN Messenger\tb.ico" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\yuduo.deo" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\psmsong.mit" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%PROGRAM_FILES%\MSXML 4.0\shesi.xot" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%HOMEPATH%\Desktop\Internet Explorer.lnk" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r System
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\淘宝购物.lnk" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r "Power Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /G Everyone:r
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\我的上网主页.lnk" /e /c /r "Authenticated Users"
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r Users
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r "%USERNAME%
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r %USERNAME%s
  • '<SYSTEM32>\cacls.exe' "%ALLUSERSPROFILE%\Desktop\在线小游戏.lnk" /e /c /r System
Modifies file system :
Creates the following files:
  • %PROGRAM_FILES%\MSXML 4.0\mnspro.nls
  • %PROGRAM_FILES%\MSXML 4.0\shesi.xot
  • %PROGRAM_FILES%\MSN Messenger\tb.ico
  • %ALLUSERSPROFILE%\Start Menu\iiee.lnk
  • %ALLUSERSPROFILE%\Start Menu\iiieee.lnk
  • %PROGRAM_FILES%\MSXML 4.0\yuduo.deo
  • %PROGRAM_FILES%\MSN Messenger\Mctray.exe
  • %PROGRAM_FILES%\MSXML 4.0\qpcdqo.exe
  • %PROGRAM_FILES%\MSXML 4.0\psmsong.mit
Sets the 'hidden' attribute to the following files:
  • %PROGRAM_FILES%\MSXML 4.0\yuduo.deo
  • %PROGRAM_FILES%\MSN Messenger\tb.ico
  • %ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk
  • %PROGRAM_FILES%\MSXML 4.0\psmsong.mit
  • %PROGRAM_FILES%\MSN Messenger\Mctray.exe
  • %PROGRAM_FILES%\MSXML 4.0\shesi.xot
Moves the following files:
  • from %ALLUSERSPROFILE%\Start Menu\iiee.lnk to %HOMEPATH%\Desktop\Internet Explorer.lnk
  • from %ALLUSERSPROFILE%\Start Menu\iiieee.lnk to %ALLUSERSPROFILE%\Desktop\Internet Explorer.lnk
Miscellaneous:
Searches for the following windows:
  • ClassName: 'SysListView32' WindowName: '(null)'
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'
  • ClassName: 'Progman' WindowName: '(null)'
  • ClassName: 'SHELLDLL_DefView' 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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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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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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