UnderGround Information

* Data Kult * ����������������� * Kryptic Night *

Lord Logics �� Raising �� Bounty Hunter

Shadow Walker �� Hell �� Nacht Habicht

- S M C - �� with Unix �� - S M C -

Realm of Infinity ��Kryptic Night�� The Viking's Den

(503)629-0814 ����������������� (408)867-1224

SMC Home - S M C - Western Dist.

Production # 3

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I - Introduction

This file will describe several ways to cause mischief on a Unix system.

Like the other SMC Productions, I will try to present the information at a

beginners level. However, all levels of hackers should benefit in some way

from the information contained within. And now... on with our show...

II - How To Fill a Hard Disk

There are several ways to cause havoc by filling up a systems hard

disk. Filling up a hard disk will make it so that the system cannot create

the temporary files vital to it's efficient use. It will also cause other

problems, such as a person trying to save a 10 page financial report, and

finding that there is no room for it. Also, if the HD is full, the system

will not run properly. You will be bombarded by a continuous stream of

'write failed, file system is full'. Over all, this is a very good way to

piss people off.

Step One

Create the following file with the 'ed [filename]' utility under the

bourne shell, or the 'edit [filename]' under the C shell. The filename can

be whatever you want, here I will call it 'hah1'. Only type in what is

contained within '[]'s, the other text is what the system will send to

you.

$[ed hah1]

*[a]

[echo Hahahahahahahahahahahahahahahahahahahahahah!!! >> -fucku!]

[nohup hah1 &]

[^C]

*[w]

754

*[q]

$[chmod +r+w+x hah1]

$[nohup hah1 &]

1234

This will create a file called '-fucku!'. Files beginning with a '-'

are very difficult to delete, as when you try to do a 'rm -fucku!'

It interprets the '-f' as an option, it tries then

to force delete the file 'ucku!'. As you can imagine.... this wouldn't

quite work. The text after the echo can be anything you wish, I just

used a sample text that is quite pointless and takes up space. The numbers

represent the file size, and process number, they will be different on

your system.

The file will add the text from the echo statement to the file '-fucku!'

until it reaches the 'hah1 &' command, which will make it start over again.

This is an endless loop. For as long as you are on-line, and their are

processes left, the file will continue to add to the file. This is a

very slow method, but it's easy if you are starting from scratch. If

you get a message such as 'cannot fork hah1: process terminated' that means

that the loop is taking up so much memory that the system can no longer

continue with that job. Don't worry, it will settle back to normal after all

the processes are eventually killed, if it does, continue to run the file

in the background until you have a '-fucku!' file that is about 100-200k

long, this will allow us to progress to our next step.

The command 'nohup hah1 &' tells unix to continue to run the 'hah1'

in the background, even after you hangup. This means you can run the

program, hang up, and call back. This function will only work under

the bourne shell. If you have a prompt of '$', then you are using the

bourne shell. This function will become exceedingly useful when we

start with the next step.

The command 'chmod +r+w+x hah1' will make the file readable, writable, and

executable by you. This string may or may not be necessary on the system you

are using. If you get a message such as 'hah1: Permission Denied' than you

will need to use the chmod command. And now onto the next step...

Step Two

We will now explore the ever powerful 'cat' command. The 'cat' command

is the equivalent of the MS-DOS 'type' command. We will use a function

of the unix system called redirection that will allow us to 'cat' files

into each other. This will cause the source file to be copied to the end

of the destination file, I'm sure you're beginning to see the mischief

you can cause with this.

To begin with, create a file called '-fucku2' the same way you created

the '-fucku!' file. Try to run the 'hah1' program until the new 'fucku2'

file is around 100-200k also. This isn't absolutely necessary, but it's

helpful and saves some time.

Next, create the following file with the editor <'ed' or 'edit'>.

I will call it 'hah2', but you may call it whatever you wish.

$[ed hah2]

*[a]

[cat -fucku! >> -fucku2]

[cat -fucku2 >> -fucku!]

[no

hup hah2 &]

[^C]

*[w]

*[q]

$[chmod +r+w+x hah2]

$[nohup hah2 &]

7049

What we've just done is create a very short, and very nasty, program

that can fill 20 megs in under 5 minutes. The file when run will add the

contents of '-fucku!' to the end of '-fucku2', and do the reverse. This

means that when you have two files of 100k to begin with, you will get

the following results after every completed loop...

-fucku! .. -fucku2 .. -fucku! .. -fucku2

100k >> 200k >> 300k >> 500k

700k >> 1200k >> 1900k >> 3100k

As you can see, the file grows VERY quickly. Set it up in the morning

before school, come back and the HD should be completely full. You may

wish to also run multiple write processes, just to confuse the system.

If you do, rename the files to something appropriate, but maintain the

base content. If you do it in several directories, the sysop will have

to do some serious cleaning to get rid of it.

Step Three

Sit back and laugh. If you wait awhile, in approximately 30 minutes,

the average 40 meg hard drive will be full. I've tested this method on

several systems, even an ancient VAX, and the results were more or less

the same. The sysop, or any other user, will be able to write anything

onto the system until this problem is resolved. Many programs need

to create temporary files to even operate. These programs are now

completely unusable, except for the few that save to memory. To delete

the files, the sysop will have to do one of several things, all of which

are very unpleasant. And now for the next lesson...

III - Mischief

This section will describe a couple of ways of perpetrating mischief on a

unix system. These ideas are for the most part harmless, but can definitely

piss people off. The idea of a continuous subdir was molded from one

presented by Shooting Shark.

Idea #1

This method will create an endless amount of directories under a

the current directory. Create multiple files with different name and

directories to really annoy the 'sop. Type the following to accomplish this.

$[ed sub1]

*[a]

[mkdir -FuCkU!1]

[chdir -FuCkU!1]

[/xxx/xxx/sub1 &]

[^C]

*[w]

*[q]

$[chmod +r+w+x sub1]

$[nohup sub1 &]

7099

This program will create a directory called '-FuCkU!1', change to that

directory, then create another one under the first one, and so forth. It

is an endless loop, and will continue virtually forever. The third line

of the program contains a string '/xxx/xxx/sub1 &'. You will need to fill

in the x's with your current directory. To find out your current directory

type 'pwd' this will print a string telling which directory you are in.

Fill in the x's with this data. The rest of the program you should be able

to figure out by now. Try it, you'll like it.

Idea #2

So, you've seen someone on the system that you really don't like? Or do

you just want to piss someone off? This methods for you. This method will

describe a way to send out data to another user, or terminal. Here is what

you will want to type to create a file to anger the other user.

$[ed beep]

*[a]

[echo ^G ^G ^G ^G Wheee!!! ^G ^G ^G >> /dev/xxxx]

[nohup beep &]

[^C]

*[w]

*[q]

$[chmod +r+w+x beep]

$[nohup beep &]

8002

Fill in the '/dev/xxxx' with the terminal you want to annoy. To find out

the terminal of the person you want to fuck over, type 'who' it will print

out something like this....

$[who]

guest ttyd0 Nov 30 19:06

root console Nov 30 19:20

Bendover ttyd5 Nov 30 18:45

The first column is the name of the user, the second column tells us

what terminal they are logged on as, and the third states at what time

they logged on. The second column is what we need right now. Fill in the

x's with the terminal that you wish. If you wanted to bother the root, you

would type '/dev/console', to bother guest type '/dev/ttyd0'. To bother

more than one terminal, just add another line after the first 'echo'

statement with a different terminal identifier. With the 'nohup' command,

the computer will send a continuous outpouring of beeps until he logs off

or reboots the system. Try it on the terminal you are logged on under to

see exactly what it does.

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IV - Conclusion

These projects should be enough to get you started on your road to Unix

Hell. With a little experience you will be able to think of new ideas that

will alloy you access to the systems hidden features and assets. I will

release other files on Unix in the near future, possibly one on basic Unix

hacking, FTP, UUCP netting, or any number of other Unix related concepts.

If you are interested in learning more on Unix, you can contact me on the

systems at the top of the file. Thus concludes one dark Kryptic Night...

V - Bibliography and Suggested Reading

Unix Use and Security From the Ground Up: by the Prophet in 1986

This is probably the BEST file I've ever seen on the subject

of Unix. It is written for the beginner, and contains valuable

information for the advanced user. The Prophet became a member

of Lod/H and is currently serving a sentence of 20 months in

relation to the big Lod/H bust of '90.

Articles on unix trojans and mischief: by Shooting Shark

Shooting Shark presents some interesting information

on various ways to commit havoc on Unix systems.

You can find most of his essays in both Phrack and Lod

magazines.

Lod/H Tech Journals

The Legion of Doom/Hackers are perhaps the most skilled

and knowledgable hackers in the underground society.

Their 'Tech Journals' describe almost anything you'd ever

want to know about illegal activities.

Phrack Magazines

Phrack is also one of the best sources for information on

a multitude of subjects, ranging from social engineering,

to carding, to making explosives. For those with free time,

download all of the 32 articles released to date.

Creating Users on Unix

This was my second text file release. It tells how to

create new users on a Unix system using the root account.

It is told for beginner and advanced hacker alike.

VI - Greets

Heh, Data Kult, when you gettin' Kelsea's phone number?

Bounty Hunter, cool new software, hope you can work out the bugs.

Lord Logics, ega STILL? Come on! Get with it!

Scooter, chill with the 800's

Oolon, get Entropy back up!

Digital Derelict, Jerusalem is nothing.... you're going down... soon

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- Kryptic Night, Data Kult, Lord Logics, Shadow Walker, Bounty Hunter -

Nacht Habicht