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Win32.HLLM.Limar.4318

Added to the Dr.Web virus database: 2012-09-18

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Spoolsv' = '<SYSTEM32>\spoolvs.exe'
  • [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe %WINDIR%\shell.exe'
  • [<HKLM>\SYSTEM\ControlSet001\Control\SecurityProviders] 'SecurityProviders' = 'msapsspc.dll, schannel.dll, digest.dll, msnsspc.dll, wowfx.dll'
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Printer' = '<SYSTEM32>\printer.exe'
Creates or modifies the following files:
  • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe
  • %HOMEPATH%\Start Menu\Programs\Startup\findfast.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe' = '%HOMEPATH%\Start Menu\Programs\Startup\findfast.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\winav.exe' = '<SYSTEM32>\winav.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe' = '%ALLUSERSPROFILE%\Start Menu\Programs\Startup\autorun.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%APPDATA%\printer.exe' = '%APPDATA%\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '%WINDIR%\shell.exe' = '%WINDIR%\shell.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<SYSTEM32>\printer.exe' = '<SYSTEM32>\printer.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
  • [<HKLM>\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List] '<SYSTEM32>\spoolvs.exe' = '<SYSTEM32>\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019'
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Task Manager (Taskmgr)
  • Registry Editor (RegEdit)
Creates and executes the following:
  • %APPDATA%\npad.exe
  • %APPDATA%\printer.exe
Executes the following:
  • <SYSTEM32>\cmd.exe /c %TEMP%\2.bat
  • <SYSTEM32>\cmd.exe /c %TEMP%\1.bat
Modifies settings of Windows Explorer:
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoControlPanel' = '00000001'
Modifies file system :
Creates the following files:
  • %PROGRAM_FILES%\altcmd\uninstall.bat
  • %PROGRAM_FILES%\altcmd\altcmd.inf
  • %PROGRAM_FILES%\altcmd\altcmd32.dll
  • <DRIVERS>\etc\st.im
  • %APPDATA%\spoolsvc.dll
  • %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\l3[1]
  • %TEMP%\2.bat
  • %APPDATA%\nvsvc1024.dll
  • %APPDATA%\npad.exe
  • %APPDATA%\printer.exe
  • <SYSTEM32>\printer.exe
  • %WINDIR%\shell.exe
  • %TEMP%\1.bat
  • <SYSTEM32>\spoolvs.exe
Deletes the following files:
  • <SYSTEM32>\wowfx.dll
  • <DRIVERS>\etc\hosts
Moves itself:
  • from <Full path to virus> to <SYSTEM32>\<Virus name>.exe
Network activity:
Connects to:
  • 'ln###live.com':80
  • 'localhost':1049
TCP:
HTTP GET requests:
  • ln###live.com/l3/?q=###################################################
UDP:
  • DNS ASK ln###live.com
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: ''
  • ClassName: 'Indicator' WindowName: ''

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