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Win32.HLLW.Autoruner2.52595

Added to the Dr.Web virus database: 2019-07-18

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Windows Update' = '%APPDATA%\WindowsUpdate.exe'
Creates the following files on removable media
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\sys.exe
Malicious functions
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
Injects code into
the following system processes:
  • %WINDIR%\microsoft.net\framework\v2.0.50727\vbc.exe
the following user processes:
  • windows update.exe
Modifies file system
Creates the following files
  • %TEMP%\sysinfo.txt
  • %APPDATA%\windows update.exe
  • %APPDATA%\pid.txt
  • %APPDATA%\pidloc.txt
  • %APPDATA%\windowsupdate.exe
Sets the 'hidden' attribute to the following files
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\sys.exe
Deletes itself.
Network activity
UDP
  • DNS ASK wh#####yipaddress.com
Miscellaneous
Creates and executes the following
  • '%APPDATA%\windows update.exe'
  • '%APPDATA%\windows update.exe' Update.exe"
Executes the following
  • '%WINDIR%\microsoft.net\framework\v2.0.50727\vbc.exe' /stext "%TEMP%\holdermail.txt"
  • '%WINDIR%\microsoft.net\framework\v2.0.50727\vbc.exe' /stext "%TEMP%\holderwb.txt"

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