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Win32.HLLW.Autoruner1.24257

Added to the Dr.Web virus database: 2012-08-02

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'System' = '<SYSTEM32>\dllcache\lsosss.exe'
Creates the following files on removable media:
  • <Drive name for removable media>:\net.exe
  • <Drive name for removable media>:\autorun.inf
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
  • hidden files
blocks execution of the following system utilities:
  • Registry Editor (RegEdit)
Creates and executes the following:
  • <SYSTEM32>\winrun.exe
  • <SYSTEM32>\xpserve.execnd1.exe
  • <SYSTEM32>\winrun.exe (downloaded from the Internet)
  • <SYSTEM32>\xpserve.execnd1.exe (downloaded from the Internet)
Modifies file system :
Creates the following files:
  • <SYSTEM32>\xpserve.execnd1.exe
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\U98D4X8H\kl[1].exe
  • <SYSTEM32>\winrun.exe
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\up[1].exe
  • <SYSTEM32>\xpserve.exe
  • C:\autorun.inf
  • C:\net.exe
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\net.exe
  • <Drive name for removable media>:\autorun.inf
  • C:\net.exe
  • C:\autorun.inf
Network activity:
Connects to:
  • 'www.ka##k.cn':80
  • 'localhost':1035
TCP:
HTTP GET requests:
  • www.ka##k.cn/kl.exe
  • www.ka##k.cn/up.exe
UDP:
  • DNS ASK www.ka##k.cn
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''