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Win32.HLLW.Autoruner3.2553

Added to the Dr.Web virus database: 2020-09-20

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\RunOnce] 'Windows Services' = '%APPDATA%\Windows Update Folder\Windows Update.exe'
Creates or modifies the following files
  • <SYSTEM32>\tasks\nyan
Creates the following files on removable media
  • <Drive name for removable media>:\svchost.exe
  • <Drive name for removable media>:\delete.lnk
  • <Drive name for removable media>:\join.lnk
Modifies file system
Creates the following files
  • %APPDATA%\windows update folder\windows update.exe
  • %APPDATA%\svchost.exe
Sets the 'hidden' attribute to the following files
  • <Drive name for removable media>:\svchost.exe
Miscellaneous
Creates and executes the following
  • '%APPDATA%\svchost.exe'
  • '%WINDIR%\syswow64\schtasks.exe' /create /tn NYAN /tr "<Full path to file>" /sc minute /mo 1' (with hidden window)
  • '%WINDIR%\syswow64\schtasks.exe' /Delete /tn NYAN /F' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\schtasks.exe' /Delete /tn NYAN /F
  • '%WINDIR%\syswow64\schtasks.exe' /create /tn NYAN /tr "<Full path to file>" /sc minute /mo 1

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