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Win32.HLLW.Autoruner.53924

Added to the Dr.Web virus database: 2011-07-10

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'MSWUpdate' = '"%APPDATA%\winlogon.exe"'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'MSWUpdate' = '"%APPDATA%\winlogon.exe"'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe "%APPDATA%\winlogon.exe"'
Creates the following files on removable media:
  • <Drive name for removable media>:\Autorun.inf
  • <Drive name for removable media>:\SYSTEM.EXE
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\winlogon.exe' = '%APPDATA%\winlogon.exe:*:Enabled:CityScape'
Creates and executes the following:
  • %APPDATA%\winlogon.exe 
Executes the following:
  • <SYSTEM32>\netsh.exe firewall add allowedprogram "%APPDATA%\winlogon.exe" CityScape Enable
Modifies file system :
Creates the following files:
  • %APPDATA%\winlogon.exe
  • %APPDATA%\tYdyhglr
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\locate_my_ip[1]
Sets the 'hidden' attribute to the following files:
  • <Drive name for removable media>:\SYSTEM.EXE
  • <Drive name for removable media>:\Autorun.inf
  • <Full path to virus>
  • %APPDATA%\winlogon.exe
Deletes the following files:
  • %APPDATA%\tYdyhglr
Network activity:
Connects to:
  • 'h4#.#o-ip.info':3177
  • 'www.ma##ind.com':80
  • 'localhost':1034
TCP:
HTTP GET requests:
  • www.ma##ind.com/app/locate_my_ip
UDP:
  • DNS ASK h4#.#o-ip.info
  • DNS ASK www.ma##ind.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Indicator' WindowName: ''
  • ClassName: '' WindowName: 'HB'
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