// Null_ProtectNT.c
// WindowsNT/2K/XP NULL IPC$ Disabler
// http://www.nullage.com/rf/

// Disables NULL access to your Windows NT/2K/XP
// NetBIOS shares through IPC$.
// HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
// Change 'restrictanonymous' to 1 from 0.

#include <windows.h>

int main()
{
	HKEY hKey;
	DWORD dwData;
	if 
(RegOpenKeyEx(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\Lsa",0,KEY_ALL_ACCESS,&hKey) 
!=0 ) return 1;
	dwData = 0x00000001;
		RegSetValueEx(hKey,"restrictanonymous",0,REG_DWORD,(LPBYTE) 
&dwData,sizeof(DWORD));
	RegCloseKey(hKey);
return 0;
}