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Trojan.Siggen18.48456

Added to the Dr.Web virus database: 2022-09-19

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\Software\Classes\htafile\Shell\Open\Command] '' = '<SYSTEM32>\mshta.exe "%1" %*'
  • [<HKLM>\Software\Classes\wcsfile\shell\open\command] '' = 'PECMD.EXE LOAD "%L"'
Malicious functions
Terminates or attempts to terminate
the following system processes:
  • %WINDIR%\regedit.exe
  • <SYSTEM32>\wbem\mofcomp.exe
  • <SYSTEM32>\ntprint.exe
  • <SYSTEM32>\net.exe
  • <SYSTEM32>\pnputil.exe
Modifies file system
Creates the following files
  • C:\users\public\libraries\~ecordedtv.tmp
  • %WINDIR%\boot_usb
  • %APPDATA%\microsoft\windows\start menu\programs\devices and printers\add printer wizard.lnk
  • %APPDATA%\microsoft\windows\start menu\programs\devices and printers\add printer driver.lnk
  • %APPDATA%\microsoft\windows\start menu\programs\devices and printers\print server properties.lnk
  • %HOMEPATH%\desktop\add printer wizard.lnk
Modifies the following files
  • C:\users\public\desktop\desktop.ini
  • C:\users\public\desktop.ini
  • C:\users\desktop.ini
  • C:\users\public\music\sample music\desktop.ini
  • C:\users\public\documents\desktop.ini
  • C:\users\public\libraries\desktop.ini
  • C:\users\public\downloads\desktop.ini
  • C:\users\public\videos\sample videos\desktop.ini
  • C:\users\public\pictures\sample pictures\desktop.ini
  • %ALLUSERSPROFILE%\microsoft\windows\start menu\programs\startup\desktop.ini
  • %ALLUSERSPROFILE%\microsoft\windows\start menu\programs\administrative tools\desktop.ini
  • C:\users\public\music\desktop.ini
  • %ALLUSERSPROFILE%\microsoft\windows\start menu\programs\desktop.ini
  • C:\users\public\pictures\desktop.ini
  • C:\users\public\videos\desktop.ini
  • %ALLUSERSPROFILE%\microsoft\windows\start menu\desktop.ini
  • %ProgramFiles(x86)%\desktop.ini
Substitutes the following files
  • C:\Users\Public\Libraries\RecordedTV.library-ms
Miscellaneous
Searches for the following windows
  • ClassName: 'RegEdit_RegEdit' WindowName: ''
Creates and executes the following
  • '<Full path to file>' LOAD *qk #20:INDATA U 32768' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C ren Run.dll Run.cmd' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C ren Config.dll Config.cmd' (with hidden window)
  • '%WINDIR%\regedit.exe' /s %WINDIR%\Inf\Usb1.inf' (with hidden window)
  • '%WINDIR%\regedit.exe' /s Mouseadd.sys' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /c echo Copyright@NasiBoot 2022>%WINDIR%\Boot_USB' (with hidden window)
  • '<SYSTEM32>\wbem\mofcomp.exe' <SYSTEM32>\wbem\win32_printer.mof >null' (with hidden window)
  • '<SYSTEM32>\wbem\mofcomp.exe' <SYSTEM32>\wbem\PrintManagementProvider.mof >null' (with hidden window)
  • '<SYSTEM32>\net.exe' start spooler' (with hidden window)
  • '<SYSTEM32>\msiexec.exe' /register' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C ren Config.CMD Config.dll' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C ren Run.CMD Run.DLL' (with hidden window)
Executes the following
  • '<SYSTEM32>\cmd.exe' /C ren Run.dll Run.cmd
  • '<SYSTEM32>\cmd.exe' /C ren Config.dll Config.cmd
  • '%WINDIR%\regedit.exe' /s %WINDIR%\Inf\Usb1.inf
  • '%WINDIR%\regedit.exe' /s Mouseadd.sys
  • '%WINDIR%\regedit.exe' /s %ProgramFiles(x86)%\Classic Shell\StartMenu.dll
  • '<SYSTEM32>\cmd.exe' /c echo Copyright@NasiBoot 2022>%WINDIR%\Boot_USB
  • '<SYSTEM32>\wbem\mofcomp.exe' <SYSTEM32>\wbem\win32_printer.mof >null
  • '<SYSTEM32>\wbem\mofcomp.exe' <SYSTEM32>\wbem\PrintManagementProvider.mof >null
  • '<SYSTEM32>\ntprint.exe'
  • '<SYSTEM32>\net.exe' start spooler
  • '<SYSTEM32>\net1.exe' start spooler
  • '<SYSTEM32>\pnputil.exe' -i -a "%WINDIR%\inf\usbprint.inf"
  • '<SYSTEM32>\msiexec.exe' /register
  • '<SYSTEM32>\cmd.exe' /C ren Config.CMD Config.dll
  • '<SYSTEM32>\cmd.exe' /C ren Run.CMD Run.DLL

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.

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.

Find out more about Dr.Web for Android

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