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Trojan.MulDrop20.557

Added to the Dr.Web virus database: 2022-04-08

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • <SYSTEM32>\tasks\driverupdate
Modifies file system
Creates the following files
  • %TEMP%\rarsfx0\yes_-_copy.bat
  • nul
  • %APPDATA%\sysinfo.txt
  • %APPDATA%\netuser.txt
  • %APPDATA%\cmdkey.txt
  • %APPDATA%\ipconfig.txt
  • C:\users\public\documents\0.bat
  • C:\users\public\documents\0.vbs
Sets the 'hidden' attribute to the following files
  • C:\users\public\documents\0.vbs
  • C:\users\public\documents\0.bat
Deletes the following files
  • %APPDATA%\sysinfo.txt
  • %APPDATA%\netuser.txt
  • %APPDATA%\cmdkey.txt
  • %APPDATA%\ipconfig.txt
  • %TEMP%\rarsfx0\yes_-_copy.bat
Miscellaneous
Searches for the following windows
  • ClassName: 'EDIT' WindowName: ''
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c ""%TEMP%\RarSFX0\yes_-_Copy.bat" "
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steamclient.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steamapps"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo Steam2.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo Steam.exe.old"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo Steam.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo Steam.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steam"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo skins"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo servers"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo SDL2.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo resource"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo remoteui"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo public"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo package"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo logs"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libx264-142.dll.md5"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libx264-142.dll.crypt"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steamclient64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steamerrorreporter.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo steamerrorreporter64.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo SteamUI.dll"
  • '%WINDIR%\syswow64\attrib.exe' "C:\Users\Public\Documents\0.vbs" +h
  • '%WINDIR%\syswow64\schtasks.exe' /create /f /sc Onidle /i 60 /tn "DriverUpdate" /tr "C:\Users\Public\Documents\0.vbs"
  • '%WINDIR%\syswow64\attrib.exe' -h "C:\Users\Public\Documents\"
  • '%WINDIR%\syswow64\cmd.exe' /c 2>NUL dir /b "%ProgramFiles%\Steam\"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo WriteMiniDump.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo winh264.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo vstdlib_s64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo vstdlib_s.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo v8.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo video.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo uninstall.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo tier0_s64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo tier0_s.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo ThirdPartyLegalNotices.html"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo ThirdPartyLegalNotices.doc"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo ThirdPartyLegalNotices.css"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo tenfoot"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo streaming_client.exe"
  • '%WINDIR%\syswow64\attrib.exe' "C:\Users\Public\Documents\0.bat" +h
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libswscale-3.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libav_h264-56.dll.md5"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libav_h264-56.dll.crypt"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo appcache"
  • '%WINDIR%\syswow64\find.exe' "ssfn"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo amf"
  • '%WINDIR%\syswow64\cmd.exe' /c 2>NUL dir /b "%ProgramFiles(x86)%\Steam\"
  • '%WINDIR%\syswow64\cmd.exe' /c 2>NUL dir /b "%APPDATA%\discord\Local Storage\leveldb\"
  • '%WINDIR%\syswow64\cmd.exe' /c 2>NUL dir /b "%APPDATA%\Mozilla\Firefox\Profiles"
  • '%WINDIR%\syswow64\timeout.exe' /t 2 /nobreak
  • '%WINDIR%\syswow64\ipconfig.exe' /all
  • '%WINDIR%\syswow64\cmdkey.exe' /list
  • '%WINDIR%\syswow64\net1.exe' user
  • '%WINDIR%\syswow64\net.exe' user
  • '%WINDIR%\syswow64\systeminfo.exe'
  • '%WINDIR%\syswow64\timeout.exe' /t 5 /nobreak
  • '%WINDIR%\syswow64\attrib.exe' "C:\Users\Public\Documents\s.exe" +h
  • '%WINDIR%\syswow64\findstr.exe' [
  • '%WINDIR%\syswow64\ping.exe' -4 -n 1 rzcitoz
  • '%WINDIR%\syswow64\cmd.exe' /c 2>NUL ping -4 -n 1 rzcitoz | findstr [
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo AppOverlay.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo AppOverlay64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo bin"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo config"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libavresample-2.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libavformat-56.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libavcodec-56.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo icuuc.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo icui18n.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo html5app"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo graphics"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo GameOverlayUI.exe"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo GameOverlayRenderer.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo GameOverlayRenderer64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo friends"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo dbghelp.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo d3dcompiler_46_64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo d3dcompiler_46.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo CSERHelper.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo crashhandler64.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo crashhandler.dll"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo controller_base"
  • '%WINDIR%\syswow64\cmd.exe' /S /D /c" echo libavutil-54.dll"
  • '%WINDIR%\syswow64\attrib.exe' "C:\Users\Public\Documents\1.bat" +h

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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Download by serial number

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.

Download Dr.Web

Download by serial number

  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