1. Starting with the basics
a. Intro to IRC
b. Intro to File Sharing
c. Intro to XDCC
2. Programs used, In Depth
e. Serv-u (brief)
f. .Bat files
Chapter 1. - Starting with the Basics
Intro to IRC
IRC is a worldwide network of computers all setup for one purpose,
communication. People can come to
IRC to chat with friends or meet new people, discuss hot topics such as
politics, religion, or breaking news. Over the recent years it has gained much
fame, much due to popularity in the warez scene. Warez, simply defined, is the
illegal downloading of copyrighted material. Groups which have access to
pre-released games, are willing to sneak a camera into a theatre, or happened
to beta test the newest Microsoft OS, are eagerly willing to digitize these
formats, and make them readily available on the internet for the masses. How
does IRC fit into this? IRC is one meeting place people (deemed leechers) can
come to congregate and download these files.
Intro to File Sharing
Ahhh.. the wonders of connecting to a server, finding a file, and
downloading it. Sure is easier than going to Best Buy and buying the game (and
usually quicker). So, what is exactly file sharing? Simply… sharing files.
Large amounts of people connect to servers, where they are all ‘connected’
to each other, to download files off others hard drives. IRC has a file server
feature, where people can connect, view files on your machine, and download
whatever you give them access too. But there are also services such as Kazza,
BearShare, Napster, LimeWire, and many more which when you search for a file,
your looking through everyones computer at once. That is what it is all about.
How is file sharing related to this article? Read on…
Intro to XDCC
Pay attention, this is where things pick up. XDCC revolutionized IRC.
Many people now use IRC because of this new ‘XDCC’ feature. What is it?
Like a file server, yet automated. It will periodically list the files
(usually 1-5 large files) in the channel (chat room) which it is hosting, for
people to download. There is a program called Iroffer (1) which makes this
even easier. It will (using the definitions in a configuration file you
setup), connect to an IRC server, join a channel, and automatically list
files. You can set bandwidth limits, max sends per persons, and more, which
will all be covered later.
Chapter 2. – Programs Used
X-Scan (2) is a great program, no doubt. Using an upgradeable exploit
database, multi-threaded scanning, and great stability, the author(s) have
really delivered. For windows, X-Scan can scan anything from POP3
vulnerabilities, cracking File Sharing passwords, null passwords, to web
server faults. When dealing with IRC XDCC hacking although, many deem to turn
to one choice in particular ‘NT-Server-Password’. What this does is scan a
large user given range of IP’s and checks for file sharing. When it finds a
windows machine with file sharing enabled (port 139), it will get a netbios
table list of all usernames on that machine. This can be acquired manually
also using the following commands in DOS:
nbtstat –A 127.0.0.1
127.0.0.1 is any given IP with file sharing or netbios. Back on track… Once
it gets a list of all usernames for an IP, it will then check for weak
passwords, or no passwords at all. Many people, when installing windows 2000,
NT, or XP will forget the true essence of a password. This is highly critical
that you set an Administrator password. For people that do not type in a
password, this is where it will take advantage of you. It will send back to
the attacker the following response:
Found NT-Server-Password: Administrator/[Blank password]
"NT-Server-Password" scan complete, Found 1.
they have this information, and you have file sharing enabled, consider
yourself fully rooted. This ‘vulnerability’ has been around for a long
time, and is not Microsoft’s fault, but user error for not supplying a
password. Chances are definite that with a strong password, the program would
had not guessed it, and moved on to the next IP. But no, you are a victim,
your computer is now property of someone you don’t even know.
Dameware NT Utilities
Once an attacker has scanned an IP range, and gathered some vulnerable
machines, they will fire up Dameware (3). This program can effectively be used
to see what your computer is doing, remotely. See what processes are running
under the current account (very useful to an attacker), look at the Event Logs
(and clear them), shut down the machine, run programs, spawn a DOS prompt
(same as shell), see the hard drives attached and the free space on them, go
through the users files, upload any new files, edit what they wish.. ect. It
is exactly like being on the victim’s computer. There is even a remote
control feature, to see the victims monitor screen in a window on your
computer, and move their mouse
like you were there sitting in their chair. A great program indeed, with much
time put into it. An attacker uses this to mainly check your free space on
your hard drive, and see what processes are running (programs in the
background, services.) Also, once they connect to your computer with this, and
login with the supplied credentials from X-Scan, they have a date pipe
connected form your machine, to their machine, and no longer need to log back
in until either you or they re-establish their connection to the internet.
This is the main problem. This program is the one which connects to a
defined IRC server, joins a defined room, and serves files. With the option to
not have a bandwidth speed limit, if this program is installed onto EDU
domains, there inlays a huge problem. Due to college universities and the
massive amount of users and data on their networks, they need a strong
backbone, with many clients that have a high rate of speed to that backbone.
Therefore, expect massive amounts of bandwidth to be thrown out of the trash,
and a growing number of complaints from students of staff for having ‘slower
browsing experiences’, or a substantial ping reply. Bah, I got off track…
that comes later on. Iroffer was originally made for *nix, but, was ported to
windows with the help of Cygwin (4).
FTP Server (6)
This program is used to install an ftp backdoor on your computer, so
files can be uploaded to your machine. The file name may be masked as
something else, but there will always be a Servudaemon.ini in the folder,
which is the file that tells the program how to act. Such as, what port on
your machine to setup the ftp protocol on, along with usernames and passwords,
and maybe privileges for each account, to limit how much some people have
access to your machine in the ‘xdcc group’ compared to others.
Ok, I learned of psexec (7) through these methods of setting up slave
machines, and since, I now have personally used it at work managing the
network computers there! This program is handy as hell, and very small, also
very legitimate. What it can do, is given the IP address (or network name) run
a program on the remote machine, even with arguments. For example:
psexec \\127.0.0.2 –u Administrator c:\winnt\system32\iroffer.exe config.txt
would this do? Simple. Psexec is telling dos to run this file, since it is not
a win32 gui program, it must be run command line. The two backslashes before
the destination just tells it that it is a network computer (LAN, or
internet), just as like going to start menu, and running \\127.0.0.2. Next the
–u tells the program ‘use the following username when logging into the
computer’. And the ‘Administrator’ following it, is just that, the
username to connect as (It asks for password after u type enter, then
verifies, and connects). Next, the drive, path and filename of the file to be
run is given, along with any arguments. In this case, I added config.txt,
which would tell Iroffer.exe to use this file to set up as it’s
configuration (i.e. IRC server to connect to, channel to join, bot info,
ect).For more commands, simply type ‘psexec’ in the command prompt of the
folder you have it in, and it will tell you all the arguments for the program
and how to use them.
These are usually small batch source files written in notepad, then
saves as a *.bat file. This file is nothing more than a group of dos commands.
What would a hacker want with dos commands? Well, for one thing firedaemon can
be executed with arguments, and in a command line interface. Also, when a
service is started, these bat files can start the service (net start servicename),
automating the process for the hacker of installing and running files on a
machine. Here is an example of a sample bat file, and what it would do.
-i ServiceName1"c:\winnt\system32" "c:\winnt\system32\iroffer.exe"
"config.txt" Y 0 0 0 Y
–I ServiceName2 "c:\winnt\system32" "c:\winnt\system32\servudaemon.exe"
"" Y 0 0 0 Y
for an explanation. This file executes firedaemon, with the required arguments
to install Iroffer.exe and servudaemon.exe. Notice the config.txt after
Iroffer, which Iroffer needs a configuration file in the first place to run so
it knows what to do. ServiceName1 and 2, are each of the services it saves
itself as on the machine. Then, ‘net start servicename1’ executes
servicename1, which would start Iroffer, and it would connect to the ircserver,
install the files, ect. Take note, as I mentioned earlier, with firedaemon,
you only need to install a service with it once, and never again does a hacker
have to worry about regaining access to your computer! It will be started up
again each time windows starts, and since it is running under a system process
(firedaemon) it will not be visible to the user that it is running.
There is another bat file administrators need to be aware of,
secure.bat. This can be found in many different versions, each unique in
it’s own way, yet each with one purpose in mind, stopping other scanners
from finding the machine. It’s really sad it has come to this, but *.edu
domains are scanned so much, all hours of the day that some people will
stumble across already hacked IP’s. And, to keep that machine from being
broken into, they ‘secure it’. None of these methods are actual
one-hundred percent securing the machine in any way, just patching it so it
does not show up in a basic scan (X-Scan being used by other malicious users.)
Usually the bat file just deletes shared drives using the net command
in dos, but this doesn’t really matter, since once the user restarts the
machine, the shared drive is back online (maybe if firedaemon was implemented
into this, but I have yet to see). There
is another method, “secures” the administrator account by getting rid of
it, then making another administrator account with the login and password
being whatever the hacker specifying, it then sets this as the master
administrator account. This is a good idea, but when most people restart there
machine wont boot back up, and the hackers not only lost an opportunity for a
bot, but also the you the admin have to go through the trouble of restoring
the accounts on the machine for the user (sound familiar?) I hope I made that
paragraph as clear as possible; I am trying hard to be somewhat very detailed.
Chapter 3. – The process
Now, Chapter 2 may have left you thinking ‘Insane! They do all that
work, just to host some movies to people that don’t even know?’ Well, not
so true. When making bots, you learn shortcuts. Sometimes u do not need to do
one stop on a machine, or you can add more lines to a batch file to simplify
things for you. Here is a timeline, along with hacker’s actions
– Hacker opens X-Scan, and enters his range. Just so happens to be 2,550 IP
address in the range, which covers an entire dorm subnet at a well known fast
– Scannign complete,
hacker looks through the logs of X-Scan, looking for any Administrator
accounts without a password, or User accounts without passwords.
– Dameware NT Utilities started up, hacker wants to connect to a an IP found
– Hacker enters IP
into dameware, double clicks on Processes. Dameware asks for a username and
password, the hacker connects as user ‘Marcy, and leaves the password field
blank. Connection successful!
– Upon looking through the processes, the hacker notices that no firewall he
or she seems to recognize installed, and proceeds to setup the bat files for
transfer for the remote machine.
– Since this machine is
running windows 2000, the hacker makes sure the bat file points to c:\winnt\
instead of c:\windows, and goes to his or her start menu, selects run, then
types \\IP\c$\winnt\system32 , where IP is the IP address found vulnerable.
– Eventually (file sharing is somewhat slow sometimes) the hacker sees the
system32 folder of the victims pc, and it looks like he is in a normal folder
browsing on his or her pc, convenient hacking isn’t it, eh Microsoft? Using
drag and drop, the hacker selects the files (.bat file to automate things, the
files for Iroffer, and servu ftp) and drags them to the window of the victims
– Approx. 1 minute later
(servu exec is around a meg, and cygwin dll is close to a meg) the files are
on the remote computer in c:\winnt\system32, job well done. But, now that the
hacker has the files where they are supposed to be, the .bat file has to be
– A few seconds, and a command prompt later, the hacker simply types:
c:\winnt\> psexec \\IP c:\winnt\system32\inst.bat
again, IP represents the internet protocol address of the remote machine, and
inst.bat is the bat file to run (can be named anything, as long as it end with
.bat.) You may have noticed I
didn’t type –u Marcy, to tell dameware to connect as that user, well in
2.B I stated that a pipe connection is made between you and that other machine
once u connect the first time (dameware), so no need to type it again, unless
u or the other machine has been restarted since.
– And back over on IRC, people see “XDCCBOT-567 has joined #warezchannel”,
at the same time the ftp is up and running, and system is secured, if the
hacker set it up so that way in the .bat file. The bot joins the channel
(Section 2.G) because the .bat launched firedaemon which created a service for
iroffer (and servu, but separate service name) on the computer, and then
launched that service.
– Need to fill this
computer with the newest movie to serve! Since the .bat file started servu ftp
server also, the hacker will just connect to the IP on the port he specified
in servudaemon.ini and using the login and password he entered in there also
(password encrypted). Now, the person will fxp files from one server, to your
– Movie complete! Time to
rar it all up into one big file using rar.exe, then add a pack with Iroffer
– Move on to next IP.
As you can see, anyone can do this. It does not take a code monkey,
assembly pounding, stack smashing genius to pull this off. In fact, anyone can
do this. Show any person which has basic knowledge of a computer what to do,
lead them through a few times, and they can get 50 bots a day into their warez
channel and waste all your bandwidth they please. Now, how are you going to
Chapter 4. -Halten!
Ok, this can easily be stopped on a university’s part. In fact, I do
not even blame this on the people’s machines which leave file sharing
enabled, or don’t have strong windows password. They don’t know any
better, half of them only use their computers at the dorms for porn or mp3’s
anyways, with the occasional e-mail to mom and dad back home. I blame this
purely on you lazy administrators out there. Seriously, if you’re going to
be an administrator, do your job. Set rules for each computer attacked to the
network, that each must log into their machine with a password and not a
default Administrator account. Also, disable file sharing on all machines. No,
I am not talking about the Peer-2-Peer programs such as Kazza
(which wouldn’t be too bad to block those anyways), I am talking about the
file sharing protocol itself. You might also want to look into a firewall
which blocks outgoing sends on port 139 for all machines, or at least is only
limited to the LAN and not an outside IP if it crucial to have. And scan your
own networks! Please, use the information in this text to scan your own
networks, see which clients on the networks have file sharing enabled, or a
weak password, and go to their dorm or room and tell them the problem. Most
likely (about seventy-five percent chance) the machine was already hacked. So,
you might want to look for firedaemon running by checking the current
processes. If the user knows what firedaemon is, and uses it for personal use,
don’t worry about it, but if they have no idea what it is, then they are
definitely a victim. Also, have all computers on the network run a firewall
application also, along with the universities network firewall built into the
Damn! I am a Victim…
If only I had written this earlier. Ok, here’s what to do. First off,
don’t format the hard drive, leave that as a last resort. Go to the Control
Panel, then select Administrative Tools. Now choose Computer Management. You
will see two boxes, left will have a list with more options, and right box
blank. In the left box, select Services and Applications, and under that click
on Services. See to your right? Those are all the services on your computer.
Look for firedaemon. Stop the service by right clicking, and selecting stop.
Or, in command prompt “net stop servicename”.
Once you have done this, right click the Firedaemon service, and go to
properties. See ‘path to executable:’? Go to that folder, and delete it.
Well, you can also look at the other files the hacker uploaded, and maybe find
a host mask or IP of who the hacker is in one of their config files.
These people getting these xdcc bots know the attention that they have
been getting lately. So, they try to cover up their activities. Firedaemon.exe
may be named something completely different, which would also change the
service name of it. Also, the configuration files edited in notepad, well
since they can be any file extension, as long as the contents are ASCII, they
may save the configuration file for Iroffer as emp.gif (used on many machines)
or mask it as a dll file. Just look for smaller files... around 1.5kb - 4kb,
and open them with notepad. What may have been Pamela.jpg could be the
configuration file for Iroffer! Now, what to do with that? Download mirc, and
connect to one of the servers listed (you will be able to tell) then go to the
channel listed (will look like this ‘channel #warezgroup -plist 20 -pformat
full’, that just means to join channel #warezgroup) See all the bots? Those
are all other victims also. Get the IP’s of any ops in the channel (ops are
people in the top of the channel list with a @ before their name), since they
run the channel, one of them knows who hacked your machine, if not one of them
in the first place. People
don’t realize how serious this is. There are 4 major slave bot servers where
warez is exchanged like this… Criten, Efnet, Undernet and Dalnet. Criten
being number one concern because the entire server is nothing but warez, it
was made primarily for nothing but people to come and download these files
from the hacked machines, with literally over a thousand slave machines logged
onto it’s servers.
Chapter 5. – Who are these people?
Believe it or not, these people are highly organized. For people I have
met as young as 14, and as old as in their upper 50’s, they all act in the
same mindset, keeping everything under control.
The leaders of the group, the big dogs. These people recruit the small
people. They run the channel, set meetings, coordinate who does what, what
bots get what warez, ect.
The scum. These people usually don’t even have control over the
channel; they are being used by the channel operators and hackers to get
important information, which machines are vulnerable. These people don’t
usually even know the dangers of scanning, or that they can easy be seen doing
a mass scan of an entire subnet by most administrators. All they do, is scan
constantly from their machines (or other hacked machines), and send the logs
to the hackers.
They don’t even deserve to be called it, but it’s legally what they
are doing. These are the people that the scanners send the logs to. Once in
their possession, they log into the machine, load the bot, start up the ftp
server, secure it, and get out.
This role may be undertaken by channel ops, or the hackers, or anyone
else with access to a box with a fats connection, a dump site (usually hacked
machine with good uptime, tosn of bandwidth, and tons of warez uploaded to
it), or a topsite (legit sites hosted by some network admins to receive warez).
They log into a ftp, then the hacked machine, and perform an FXP transfer,
which is transferring from site to site. A common program to do this is
FlashFXP, a legit program.
The masses of people that join a channel (chat room) and download from
the bots. They send a command to the bots, and the files are sent, or they are
places in a send queue. The channels are more powerful if they have more
leechers in their channel (easily thousands of people).
Chapter 6. - Ending Notes
In this I noted the most common method people are using. Firedaemon
will always be used, these hackers need to restart their programs each time
you reboot. But, more sophiscated kids might employ other methods to scan or
install these services. There are the ‘rootkits’, which are programs that
auto mate the entire process. A hacker types in a range, and it will
automatically scan for the vulnerability, copy files, run them, and secure
they system, then move on. These are not ‘publicly’ available on the
internet for download, but in fact kept low. People program these, and may
only be given out to one or two other very close peers, or nobody at all.
Another method would be running
an eggdrop service on IRC, with specific tcl scripts to scan for them. Then a
hacker types a command, it will scan, and with another command send the
results back (automated scripting.)
Hackers may not always access your networks from their computers. A
method becoming widely used now is to hack a residential cable or DSL line,
and do all the hacking from there. That way they are not themselves directly
connecting to the remote victim PC, rather routing through another box.
I hope I covered everything, any further questions you have feel free
to e-mail me. I want to make a further note, please don’t take this as ‘Oh
whew! I have cable, I am not vulnerable!’ Cause your wrong, in fact in a
scan of 1275 *.edu IP’s, compared to 1275 cable IP’s, there were 170% more
cable machines found vulnerable. Just since not as much of bandwidth is in
play, most hackers wont install an xdcc bot onto these machines, maybe a DDoS
(Distributed Denial of Service) bot, but if you have antivirus it should pick
up most major versions like Evilbot (sorry, no kaiten.) Cable users with
Optonline ISP (*.optonline.*) need to be aware, since you are all on 10mbit
lines for each computers. Pretty much everyone is vulnerable, but these
hackers are greedy, and want only the fastest lines. *.edu preferred, but if
things get grim enough, optonlines and other ISP’s with faster than usual
cable/DSL speeds may become targeted. That
wraps it up, stay safe everyone. If you have any questions, feel free to
e-mail me at email@example.com,
Iroffer : www.iroffer.org
X-Scan : http://www.xfocus.org/programs.php
Cygwin : http://www.cygwin.com
Firedaemon : http://www.firedaemon.com
FTP Server : http://www.serv-u.com