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Win32.HLLW.Autohit.13310

Added to the Dr.Web virus database: 2013-07-20

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe csrcs.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run] 'csrcs' = '<SYSTEM32>\csrcs.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices] 'csrcs' = '<SYSTEM32>\csrcs.exe'
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
Creates and executes the following:
  • '<SYSTEM32>\csrcs.exe'
Modifies file system :
Creates the following files:
  • %TEMP%\aut2.tmp
  • %TEMP%\hvavzgf
  • <SYSTEM32>\csrcs.exe
  • %TEMP%\aut1.tmp
  • %TEMP%\xypwycj
Sets the 'hidden' attribute to the following files:
  • <SYSTEM32>\csrcs.exe
Deletes the following files:
  • %TEMP%\aut2.tmp
  • %TEMP%\hvavzgf
  • %TEMP%\aut1.tmp
  • %TEMP%\xypwycj
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'