Instructables
If you have ever wanted to freeze all of the computers in a network (such as at work or school), here is your chance. This can be a hilarious prank, but be aware that some people might get upset when their computers are all frozen. (Be careful! If you don't have permission or ownership, charges can be filed against you. This prank is technically classified as a Denial of Service attack. I will not be responsible for anything you do with this information.)

This mass freezing will work by having one or more "host" computers send hundreds of thousands of pop-up messages to everyone in the network. Every time you try to click on something, more pop-ups have gotten in the way, soon freezing the computer. When all of the computers are shut off and rebooted, it starts all over!
Have fun!
 
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Step 1: Write the Script

First we will write the netsend script. This will send a message to all of the computers on the network. You can either do batch or VBS on this, but batch is more intimidating. Here is the code that you need, and remember to save it as anything.bat (the part before .bat can be whatever you want). :

@echo off
:start
net send * messagehere
goto start

What this will do is send a pop-up message to all of the computers in your network, and then loop back and do it again. It will go as fast as possible, taking up all of the CPU usage. That way, no one could stop the program (as that takes up CPU) without turning off the machine. As all of the network's computers are going ballistic with pop-ups, no one will know which one is causing it (especially if you launch this from two computers in the network, as they would both be causes but look like victims).
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jas3304 years ago
whats the chance of getting caught like having it traced back to your computor
greenbean (author)  jas3304 years ago
   There is a 99.999...% chance of this being traced back to your computer's IP. The real question is whether the computer you use can be tracked back to you. If you are on a public network, then the chance is slim. If you're using a school computer, and are logged in under your name, then there is little chance of you getting away.
   It depends therefore on if the computer is traceable to you, and if so, how competent security is in your situation.

what if you do this on a school network through a personal computer

terrible here. They wouldn't let me switch the keyboard layout to dvorak even when I asked nicely
A.C.E.3 years ago
is there a way you can do something like this, but instead of just sending a msgbox you can send another batch file? like... send this batch file to every other computer so not only does it get the boxes, but if you turn it off and then back on it becomes a host again? if they forgot to shut one of they would have to do it all over again hahaha and there are other files i could send that this method would help with too ;)

Its possible but not with net send command

greenbean (author)  A.C.E.3 years ago
It sounds like youre asking how to make a remote computer run your commands. That its moving from a funny prank towards malicious code. And, that would be difficult, as the whole point of firewalls is to stop that process. people do it, but not with batch, and not as begginers.
Orelldo3 years ago
Hey, is it possible to add a picture file to the messages that get spammed?

It is possible but its a lot easyier to track

yes there is

Super_Nerd3 years ago
Is there a way to do this with Visual Basic Script?
greenbean (author)  Super_Nerd2 years ago
Yes. Either one can do this. The syntax is slightly different, though.
Do you know how to?
tyler96135 years ago
Thanks for enlightening one of our students minds with this! He did this on a network of around 200 computers, and we couldn't even find the computer that started it!

LOL, but it was pretty funny seeing everyone freaking out that their computers wouldn't work. But we had to do a whole network reboot because it created a lot of overhead network interference.

We have since stopped and removed the messenger service from all our computers :)

greenbean (author)  tyler96135 years ago
You are very welcome! That is exactly what I want to hear: someone using it. I'm especially glad that it worked as planned. I have to admit that I never tested this myself.
 Is there any way to send this in an email.  so when the user opens the email and clicks a link it will run and possibly auto create as a startup program if so could you tell me how
Sorry mate, but sending batch files is illegal. You could try this in VB Script though
As VB runs invisible and it can do more than batch files
greenbean (author)  RedFlash4 years ago
     Before you read, know that I disclaim any responsibility for what you do with this information. Use your head.



     You aren't supposed to send batch files, but you technically can... yahoo supports it. Remember though that you would have to send it with yahoo and have it be recieved with yahoo. Outlook also causes problems.
      What you can also do is try converting it into an exe. You can do this with software, or if you know how to program with C, you can easily do this manually.
       You could also try writing a vbs version. This also is very easy.
  
The answer is yes!
Just ask if you have any more questions.
That's the third time you've said that...
Make that fourth......
greenbean (author)  michaelb9584 years ago
I don't know why that happened.... It posted at three very different times. I can assure you that was not intended.
I realised. It is still illegal
greenbean (author)  RedFlash4 years ago
     Before you read, know that I disclaim any responsibility for what you do with this information. Use your head.



     You aren't supposed to send batch files, but you technically can... yahoo supports it. Remember though that you would have to send it with yahoo and have it be recieved with yahoo. Outlook also causes problems.
      What you can also do is try converting it into an exe. You can do this with software, or if you know how to program with C, you can easily do this manually.
       You could also try writing a vbs version. This also is very easy.
  
The answer is yes!
Just ask if you have any more questions.
greenbean (author)  aspangmac4 years ago
     Before you read, know that I disclaim any responsibility for what you do with this information. Use your head.



     You aren't supposed to send batch files, but you technically can... yahoo supports it. Remember though that you would have to send it with yahoo and have it be recieved with yahoo. Outlook also causes problems.
      What you can also do is try converting it into an exe. You can do this with software, or if you know how to program with C, you can easily do this manually.
       You could also try writing a vbs version. This also is very easy.
  
The answer is yes!
Just ask if you have any more questions.
 LOL! 200? Not enough I was brave enough to do it on a server...of almost 1 million computers. It was so much fun....I never got to see the victims...sob.
greenbean (author) 4 years ago
Readers:
  I noticed that there are no instructables on how to make a network instant messenger. (It's easy to find how with VB 6, with the Winsock, but there is nothing on Instructables or Youtube on the subject with the only available one, VB 2008.)
  Is anyone interested?
Yes, I am!
its easy in batch. just find the computername using echo %computername%
then netsend it to that.

I wrote really complicated batch files before. like they could auto-update from a server (on the network) and other stuff.

you can also find the current username using echo %username%

then you could put that into a file: echo %username% > username
(and no, I do not believe in file extensions)

*digs out old paper with hand written batch file*

and you can get user input with set /p varname= prompt:
then echo that with echo %varname%

also, get wget for windows. wget is awesome
I would
will4213 years ago
At my school they let us bring USB drives and plug them in.
My first thought of what to put on the drive was an autorun file and a VBS or Batch file. ;)
martzsam4 years ago
I want to do this but the comps at my school have the XP/Novel system on them, the security on this things is tighter then my ball of Christmas lights in the basement. I can't access my proxy site or even setup mozzilla on the comp. Will this still work?
hintss martzsam3 years ago
actually, those are implemented seperately. working as a TA for the IT guy at the school has its advatages.

novell reimaging:

try holding F12 while booting the computer, then if is says something about vmlinux, hold Ctrl and Alt until theres a pretty blue screen

also, respect the admins, we have to deal with people stealing RAM, hauling computers upstairs, cleaning dust out, sorting through thousands of files (like, we actually try to find these things...), and dealing with *gasp* budget cuts
martzsam hintss3 years ago
Interesting... But it doesn't matter anymore, I go to a different school now. I have yet to discover what security they use, because I haven't gotten a chance at a workstation, but I will keep that in mind.

Thanks,
Sam
greenbean (author)  martzsam4 years ago
I can't say for sure, as I don't know exactly what kind of fun stoppage is running on those things, but it should if it is enabled. Make sure that two of the computers are enabled, then send a netsend (only one) to the other computer. If it makes the journey, then yes, it will still work.
Alright thanks.
if your using the same web blocker our school is try thi "1.1.hidemyass.com/?desired url" it will take you to a screen with a box that says youtube or something thenjust inser and go crazy. also the first 1 can be any number 1-10 and second 1 is 1-3
EggNog6664 years ago
How come I cant change the messnger to automatic? it just gives me a error message saying acces denied!
greenbean (author)  EggNog6664 years ago
     Before you read, know that I disclaim any responsibility for what you do with this information. Use your head.



     You aren't supposed to send batch files, but you technically can... yahoo supports it. Remember though that you would have to send it with yahoo and have it be recieved with yahoo. Outlook also causes problems.
      What you can also do is try converting it into an exe. You can do this with software, or if you know how to program with C, you can easily do this manually.
       You could also try writing a vbs version. This also is very easy.
  
The answer is yes!
Just ask if you have any more questions.
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