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Trojan.DownLoader10.39224

Added to the Dr.Web virus database: 2013-10-31

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\DDHelper.lnk
Creates the following services:
  • [<HKLM>\SYSTEM\ControlSet001\Services\DD_Service] 'Start' = '00000002'
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe' = '%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe:*:Enabled:DualDesk-Server'
Creates and executes the following:
  • '%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe' -install
  • '%TEMP%\nse5.tmp\nsD.tmp' "netsh.exe" firewall add allowedprogram "%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe" "DualDesk-Server" ENABLE
  • '%TEMP%\nse5.tmp\nsC.tmp' "netsh.exe" firewall add allowedprogram "%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe" "DualDesk-Server" ENABLE ALL
  • '%PROGRAM_FILES%\DD20.4.7201306271824\DDHelper.exe'
  • '%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe' -service_run
  • '%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe' -service
  • '%TEMP%\nse5.tmp\nsB.tmp' "sc.exe" delete DD_CAD
  • '%TEMP%\nse5.tmp\ns7.tmp' "sc.exe" stop DD_CAD
  • '%TEMP%\nse5.tmp\ns6.tmp' "sc.exe" stop DD_Service
  • '%TEMP%\nsw3.tmp\DD_atshq.dynip.com_6116.exe' /20011903202294235655_Andromeda Technology Solutions Inc./0
  • '%TEMP%\nse5.tmp\nsA.tmp' "sc.exe" delete DD_Service
  • '%TEMP%\nse5.tmp\ns9.tmp' "net.exe" stop DD_CAD
  • '%TEMP%\nse5.tmp\ns8.tmp' "net.exe" stop DD_Service
Executes the following:
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe" "DualDesk-Server" ENABLE
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe" "DualDesk-Server" ENABLE ALL
  • '<SYSTEM32>\sc.exe' delete DD_CAD
  • '<SYSTEM32>\sc.exe' /flushdns
  • '<SYSTEM32>\ipconfig.exe' /flushdns
  • '<SYSTEM32>\net1.exe' start "DD_Service"
  • '<SYSTEM32>\sc.exe' delete DD_Service
  • '<SYSTEM32>\net.exe' stop DD_Service
  • '<SYSTEM32>\sc.exe' stop DD_CAD
  • '<SYSTEM32>\sc.exe' stop DD_Service
  • '<SYSTEM32>\net1.exe' stop DD_CAD
  • '<SYSTEM32>\net.exe' stop DD_CAD
  • '<SYSTEM32>\net1.exe' stop DD_Service
Injects code into
the following system processes:
  • <SYSTEM32>\sc.exe
Modifies file system :
Creates the following files:
  • %PROGRAM_FILES%\DD20.4.7201306271824\Flag.txt
  • %PROGRAM_FILES%\DD20.4.7201306271824\DD.txt
  • %PROGRAM_FILES%\DD20.4.7201306271824\UnDD.txt
  • %TEMP%\nse5.tmp\cad.exe
  • %TEMP%\nse5.tmp\DualDesk.exe
  • %TEMP%\nse5.tmp\ns8.tmp
  • %TEMP%\nse5.tmp\ns7.tmp
  • %TEMP%\nse5.tmp\ns9.tmp
  • %TEMP%\nse5.tmp\nsB.tmp
  • %TEMP%\nse5.tmp\nsA.tmp
  • %HOMEPATH%\Desktop\Stop Remote Support.lnk
  • %PROGRAM_FILES%\DD20.4.7201306271824\Uninst.exe
  • %HOMEPATH%\Desktop\ToolBox 20.4.7.0.lnk
  • %PROGRAM_FILES%\DD20.4.7201306271824\ToolBox\DDHelper.lnk
  • %PROGRAM_FILES%\DD20.4.7201306271824\ToolBox\DualDesk.lnk
  • %TEMP%\nsw3.tmp\ToolBox\DD20.4.7.txt
  • %TEMP%\nsw3.tmp\Configs\DD20.4.7.txt
  • %TEMP%\nse5.tmp\nsC.tmp
  • %PROGRAM_FILES%\DD20.4.7201306271824\StopDD.reg
  • %TEMP%\nse5.tmp\nsD.tmp
  • %TEMP%\nsw3.tmp\Icon1.ico
  • %TEMP%\nsw3.tmp\Logo.bmp
  • %TEMP%\nsw3.tmp\Icon2.ico
  • %TEMP%\nsw3.tmp\Ring.wav
  • %TEMP%\nsw3.tmp\Blank.bmp
  • %TEMP%\nsw3.tmp\DD_atshq.dynip.com_6116.exe
  • %TEMP%\nsr2.tmp
  • %TEMP%\nsw3.tmp\ddHelper.exe
  • %TEMP%\nsw3.tmp\Splash.bmp
  • %TEMP%\nsw3.tmp\DD.txt
  • %HOMEPATH%\Start Menu\Programs\Administrative Tools\desktop.ini
  • %PROGRAM_FILES%\DD20.4.7201306271824\Advantig.txt
  • %HOMEPATH%\My Documents\My Videos\Desktop.ini
  • %TEMP%\nse5.tmp\ns6.tmp
  • %TEMP%\nse5.tmp\nsExec.dll
  • %TEMP%\nsw3.tmp\DD-Done.txt
  • %TEMP%\nsw3.tmp\Splash.dll
  • %TEMP%\nsisdt.dll
  • %TEMP%\nsw3.tmp\DD2294235655.txt
  • %TEMP%\nse5.tmp\NSISdl.dll
Sets the 'hidden' attribute to the following files:
  • %HOMEPATH%\My Documents\My Videos\Desktop.ini
Deletes the following files:
  • %PROGRAM_FILES%\DD20.4.7201306271824\Flag.txt
  • %TEMP%\nsw3.tmp\DD-Done.txt
  • %PROGRAM_FILES%\DD20.4.7201306271824\DD.txt
  • %PROGRAM_FILES%\DD20.4.7201306271824\UnDD.txt
  • %TEMP%\nse5.tmp\nsC.tmp
  • %TEMP%\nse5.tmp\nsExec.dll
  • %TEMP%\nse5.tmp\NSISdl.dll
  • %TEMP%\nse5.tmp\nsD.tmp
  • %TEMP%\nse5.tmp\cad.exe
  • %PROGRAM_FILES%\DD20.4.7201306271824\Advantig.txt
  • %TEMP%\nse5.tmp\ns6.tmp
  • %TEMP%\nsisdt.dll
  • %TEMP%\nsw3.tmp\DD2294235655.txt
  • %TEMP%\nse5.tmp\ns7.tmp
  • %TEMP%\nse5.tmp\nsA.tmp
  • %TEMP%\nse5.tmp\nsB.tmp
  • %TEMP%\nse5.tmp\ns8.tmp
  • %TEMP%\nse5.tmp\ns9.tmp
Moves the following files:
  • from %TEMP%\nsw3.tmp\DD.txt to %PROGRAM_FILES%\DD20.4.7201306271824\DD.txt
  • from %TEMP%\nsw3.tmp\Ring.wav to %PROGRAM_FILES%\DD20.4.7201306271824\Ring.wav
  • from %TEMP%\nse5.tmp\DualDesk.exe to %PROGRAM_FILES%\DD20.4.7201306271824\DualDesk.exe
  • from %TEMP%\nsw3.tmp\ddHelper.exe to %PROGRAM_FILES%\DD20.4.7201306271824\DDHelper.exe
  • from %TEMP%\nsw3.tmp\Icon1.ico to %PROGRAM_FILES%\DD20.4.7201306271824\icon1.ico
  • from %TEMP%\nsw3.tmp\Logo.bmp to %PROGRAM_FILES%\DD20.4.7201306271824\Logo.bmp
  • from %TEMP%\nsw3.tmp\Blank.bmp to %PROGRAM_FILES%\DD20.4.7201306271824\Blank.bmp
  • from %TEMP%\nsw3.tmp\Icon2.ico to %PROGRAM_FILES%\DD20.4.7201306271824\icon2.ico
Network activity:
Connects to:
  • 'at###.dynip.com':6116
  • 'www.du###esk.com':80
TCP:
HTTP GET requests:
  • www.du###esk.com/unreg/2294235655.txt
UDP:
  • DNS ASK at###.dynip.com
  • DNS ASK www.du###esk.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'DualDesk Tray Icon' WindowName: '(null)'
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'
  • ClassName: 'SysListView32' WindowName: '(null)'
  • ClassName: 'DualDesk desktop sink' WindowName: '(null)'
  • ClassName: '#32770' 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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  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);
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    • Switch off your device and turn it on as normal.

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