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Trojan.DownLoader8.23729

Added to the Dr.Web virus database: 2013-03-23

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe %WINDIR%\shell.exe'
  • [<HKLM>\SYSTEM\ControlSet001\Control\SecurityProviders] 'SecurityProviders' = 'msapsspc.dll, schannel.dll, digest.dll, msnsspc.dll, wowfx.dll'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Printer' = '<SYSTEM32>\printer.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Spoolsv' = '<SYSTEM32>\spoolvs.exe'
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe
  • %HOMEPATH%\Start Menu\Programs\Startup\findfast.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
Creates and executes the following:
  • %APPDATA%\npad.exe
  • %APPDATA%\printer.exe
Executes the following:
  • <SYSTEM32>\cmd.exe /c %TEMP%\2.bat
  • <SYSTEM32>\cmd.exe /c %TEMP%\1.bat
Modifies settings of Windows Explorer:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoControlPanel' = '00000001'
Modifies file system :
Creates the following files:
  • %PROGRAM_FILES%\altcmd\uninstall.bat
  • %PROGRAM_FILES%\altcmd\altcmd.inf
  • %PROGRAM_FILES%\altcmd\altcmd32.dll
  • <DRIVERS>\etc\st.im
  • %APPDATA%\spoolsvc.dll
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\l3[1]
  • %TEMP%\2.bat
  • <SYSTEM32>\printer.exe
  • %APPDATA%\npad.exe
  • %APPDATA%\printer.exe
  • <SYSTEM32>\spoolvs.exe
  • %TEMP%\1.bat
  • %APPDATA%\nvsvc1024.dll
  • %WINDIR%\shell.exe
Deletes the following files:
  • <SYSTEM32>\wowfx.dll
  • <DRIVERS>\etc\hosts
Moves the following files:
  • from %APPDATA%\npad.exe to <SYSTEM32>\npad.exe
  • from %APPDATA%\nvsvc1024.dll to <SYSTEM32>\wowfx.dll
Moves itself:
  • from <Full path to virus> to <SYSTEM32>\<Virus name>.exe
Network activity:
Connects to:
  • 'ln###live.com':80
  • 'localhost':1051
TCP:
HTTP GET requests:
  • ln###live.com/l3/?q=###################################################
UDP:
  • DNS ASK ln###live.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: 'Indicator' WindowName: ''

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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