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Win32.HLLW.Autoruner2.56336

Added to the Dr.Web virus database: 2019-08-09

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\software\Microsoft\Windows\CurrentVersion\Run] 'a776f64be5bb4ed04e63df16964db9d0' = '"%TEMP%\svhost.exe" ..'
  • [<HKLM>\software\Microsoft\Windows\CurrentVersion\Run] 'a776f64be5bb4ed04e63df16964db9d0' = '"%TEMP%\svhost.exe" ..'
Creates the following files on removable media
  • <Drive name for removable media>:\a776f64be5bb4ed04e63df16964db9d0.exe
  • <Drive name for removable media>:\autorun.inf
Malicious functions
To bypass firewall, removes or modifies the following registry keys
  • [<HKLM>\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\svhost.exe' = '%TEMP%\svhost.exe:*:Enabled:svhost.exe'
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
Executes the following
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\svhost.exe" "svhost.exe" ENABLE
Modifies file system
Creates the following files
  • %TEMP%\svhost.exe
Sets the 'hidden' attribute to the following files
  • <Drive name for removable media>:\a776f64be5bb4ed04e63df16964db9d0.exe
  • <Drive name for removable media>:\autorun.inf
  • %TEMP%\svhost.exe
Network activity
UDP
  • DNS ASK im###a.dynu.net
Miscellaneous
Creates and executes the following
  • '%TEMP%\svhost.exe'
  • '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\svhost.exe" "svhost.exe" ENABLE' (with hidden window)

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