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As you can see, by the sixth generation there are a million e-mail messages being processed by our mail servers. The capacity to handle these messages must be paid for by the users or, if it is not paid for, the mail servers slow down to a crawl or crash. Note that this example only forwards the message to 10 people at each generation while people who forward real hoax messages often send them to many times that number.
Recently, we have been hearing of spammers (bulk mailers of unsolicited mail) harvesting e-mail addresses from hoaxes and chain letters. After a few generations, many of these letters contain hundreds of good addresses, which is just what the spammers want. We have also heard rumors that spammers are deliberately starting hoaxes and chain letters to gather e-mail addresses (of course, that could be a hoax).  So now, all those nice people who were so worried about the poor little girl dying of cancer find themselves not only laughed at for passing on a hoax but also the recipients of tons of spam mail.

How to Recognize a Hoax

Probably the first thing  you should notice about a warning is the request to "send this to everyone you know" or some variant of that statement. This should raise a red flag that the warning is probably a hoax. No real warning message from a credible source will tell you to send this to everyone you know.
Next, look at what makes a successful hoax. There are two known factors that make a successful hoax, they are:
(1)  technical sounding language.
(2)  credibility by association.
If the warning uses the proper technical jargon, most individuals, including technologically savvy individuals, tend to believe the warning is real. For example, the Good Times hoax says that "...if the program is not stopped, the computer's processor will be placed in an nth-complexity infinite binary loop which can severely damage the processor...". The first time you read this, it sounds like it might be something real. With a little research, you find that there is no such thing as an nth-complexity infinite binary loop and that processors are designed to run loops for weeks at a time without damage.
When we say credibility by association we are referring to who sent the warning. If the janitor at a large technological organization sends a warning to someone outside of that organization, people on the outside tend to believe the warning because the company should know about those things. Even though the person sending the warning may not have a clue what he is talking about, the prestige of the company backs the warning, making it appear real. If a manager at the company sends the warning, the message is doubly backed by the company's and the manager's reputations. 
Both of these items make it very difficult to claim a warning is a hoax so you must do your homework to see if the claims are real and if the person sending out the warning is a real person and is someone who would know what they are talking about. You do need to be a little careful verifying the person as the apparent author may be a real person who has nothing to do with the hoax. If thousands of people start sending them mail asking if the message is real, that essentially constitutes an unintentional denial of service attack on that person. Check the person's web site or the person's company web site to see if the hoax has been responded to there. Check these pages or the pages of other hoax sites to see if we have already declared the warning a hoax.
Hoax messages also follow the same pattern as a chain letter (see below).

Recognizing a Chain Letter

Chain letters and most hoax messages all have a similar pattern. From the older printed letters to the newer electronic kind, they all have three recognizable parts:
A hook.
A threat.
A request.

The Hook

First, there is a hook, to catch your interest and get you to read the rest of the letter. Hooks used to be "Make Money Fast" or "Get Rich" or similar statements related to making money for little or no work. Electronic chain letters also use the "free money" type of hooks, but have added hooks like "Danger!" and "Virus Alert" or "A Little Girl Is Dying". These tie into our fear for the survival of our computers or into our sympathy for some poor unfortunate person.

The Threat

When you are hooked, you read on to the threat. Most threats used to warn you about the terrible things that will happen if you do not maintain the chain. However, others play on greed or sympathy to get you to pass the letter on. The threat often contains official or technical sounding language to get you to believe it is real.

The Request

Finally, the request. Some older chain letters ask you to mail a dollar to the top ten names on the letter and then pass it on. The electronic ones simply admonish you to "Distribute this letter to as many people as possible." They never mention clogging the Internet or the fact that the message is a fake, they only want you to pass it on to others.
Chain letters usually do not have the name and contact information of the original sender so it is impossible to check on its authenticity. Legitimate warnings and solicitations will always have complete contact information from the person sending the message and will often be signed with a cryptographic signature, such as PGP to assure its authenticity. Many of the newer chain letters do have a person's name and contact information but that person either does not really exist or does exist but does not have anything to do with the hoax message. As mentioned in the previous section,  try to use other means than contacting the person directly to find out if the message is a hoax. Try the person's web page, the person's company web page, or this and other hoax sites first to see if the message has already been declared a hoax.
For example, the PENPAL GREETINGS! hoax shown below appears to be an attempt to kill an e-mail chain letter. This chain letter is a hoax because reading a text e-mail message does not execute a virus nor does it execute any attachments; therefore the Trojan horse must be self starting. Aside from the fact that a program cannot start itself, the Trojan horse would have to know about every different kind of e-mail program to be able to forward copies of itself to other people. We have had to modify this statement slightly for the newer html mail readers. If a mail message is formatted with html and contains scripts, those scripts will run when the e-mail message is read. Active scripting should always be turned off for a mail reader so that malicious code like the KAK worm cannot automatically run.
Notice the three parts of a chain letter, which are easy to identify in this example.

The Hook

       FYI!
 
       Subject:  Virus Alert
       Importance:  High
       If anyone receives mail entitled: PENPAL GREETINGS! please delete it WITHOUT 
       reading it.  Below is a little explanation of the message, and what it would 
       do to your PC if you were to read the message.  If you have any questions or
 
       concerns please contact  SAF-IA Info Office on 697-5059.

The Threat

       This is a warning for all internet users - there is a dangerous virus 
       propogating across the internet through an e-mail message entitled "PENPAL 
       GREETINGS!".  
       DO NOT DOWNLOAD ANY MESSAGE ENTITLED "PENPAL GREETINGS!"
       This message appears to be a friendly letter asking you if you are 
       interested in a penpal, but by the time you read this letter, it is too late.  
       The "trojan horse" virus will have already infected the boot sector of your hard 
       drive, destroying all of the data present.  It is a self-replicating
 virus, 
       and once the message is read, it will AUTOMATICALLY forward itself to anyone 
       who's e-mail address is present in YOUR mailbox!
       This virus will DESTROY your hard drive, and holds the potential to DESTROY 
       the hard drive of anyone whose mail is in your inbox, and who's mail is in 
       their
 inbox, and so on.  If this virus remains unchecked, it has the potential 
       to do a great deal of DAMAGE to computer networks worldwide!!!!
       Please, delete the message entitled "PENPAL GREETINGS!" as soon as you see it!

The Request

       And pass this message along to all of your friends and relatives, and the
       other readers of the
 newsgroups and mailing lists which you are on, so that 
       they are not hurt by this dangerous virus!!!!

Validating a Warning

CIAC recommends that you DO NOT circulate  warnings without first checking with an authoritative source. Authoritative sources are your computer system security administrator, your computer incident handling team, or your antivirus vendor. Real warnings about viruses and other network problems are issued by computer security response teams (CIAC, CERT, ASSIST, NASIRC, etc.) and are digitally signed by the sending team using PGP. If you download a warning from a team's web site or validate the PGP signature, you can usually be assured that the warning is real. Warnings without the name of the person sending the original notice, or warnings with names, addresses and phone numbers that do not actually exist are probably hoaxes. Warnings about new malicious code are also available at the antivirus vendors sites and at the operating system's vendor site.

What to Do When You Receive a Warning

Upon receiving a warning, you should examine its PGP signature to see that it is from a real response team or antivirus organization. To do so, you will need a copy of the PGP software and the public signature of the team that sent the message. The CIAC signature is available at the CIAC home page: http://ciac.llnl.gov/ You can find the addresses of other response teams by connecting to the FIRST web page at: http://www.first.org. If there is no PGP signature, check at this and other hoax sites to see if the warning has already been declared as a hoax. If you do not find the warning at the hoax sites, it just may mean that we have not yet seen this particular hoax. See if the warning includes the name of the person submitting the original warning. If it does, see if you can determine if the person really exists. If they do, don't send them an e-mail message. It is likely that they have nothing to do with this hoax and thousands of people sending them questions will be just as damaging to them as sending around the hoax message. Instead, check their personal or company web site. Often if a person has been the brunt of a hoax, that hoax message will be debunked on the person's company web site. If you still cannot determine if a message is real or a hoax, send it to your computer security manager, your ISP, or your incident response team and let them validate it.

When in Doubt, Don't Send It Out.

In addition, most anti-virus companies have a web page containing information about most known viruses and hoaxes. You can also call or check the web site of the company that produces the product that is supposed to contain the virus. Checking the PKWARE site for the current releases of PKZip would stop the circulation of the warning about PKZ300 since there is no released version 3 of PKZip. Other useful virus and hoax sites are listed on our Other Hoax Sites pages. In most cases, common sense would eliminate Internet hoaxes.

Why People Send Chain Letters and Hoax Messages

Only the original writer knows the real reason, but some possibilities are:
To see how far a letter will go.
To harass another person (include an e-mail address and ask everyone to send mail, e.g. Jessica Mydek).
To bilk money out of people using a pyramid scheme.
To kill some other chain letter (e.g. Make Money Fast).
To damage a person's or organization's reputation.

History of Virus Hoaxes

Since 1988, computer virus hoaxes have been circulating the Internet. In October of that year, according to Ferbrache ("A pathology of Computer Viruses" Springer, London, 1992) one of the first virus hoaxes was the 2400 baud modem virus:
        SUBJ: Really Nasty Virus
        AREA: GENERAL (1)
 
        I've just discovered probably the world's worst computer virus
        yet. I had just finished a late night session of BBS'ing and file
        treading when I exited Telix 3 and attempted to run pkxarc to
        unarc the software I had downloaded. Next thing I knew my hard
        disk was seeking all
 over and it was apparently writing random
        sectors. Thank god for strong coffee and a recent backup.
        Everything was back to normal, so I called the BBS again and
        downloaded a file. When I went to use ddir to list the directory,
        my hard disk was getting trashed again. I tried Procomm Plus TD
        and also PC Talk 3. Same results every time. Something was up so I
        hooked up to my test equipment and different modems (I do research
        and development for a local computer telecommunications company
        and have an in-house lab at my disposal). After another hour of
        corrupted hard drives I found what I think is the world's worst
        computer virus yet. The virus distributes itself on the modem sub-
        carrier present in all 2400 baud and up modems. The sub-carrier is
        used for ROM and register debugging purposes only, and otherwise
        serves no othr (sp) purpose. The virus sets a bit pattern in one
        of the internal modem registers, but it seemed to screw up
 the
        other registers on my USR. A modem that has been "infected" with
        this virus will then transmit the virus to other modems that use a
        subcarrier (I suppose those who use 300 and 1200 baud modems
        should be immune). The virus then attaches itself to all binary
        incoming data and infects
 the host computer's hard disk. The only
        way to get rid of this virus is to completely reset all the modem
        registers by hand, but I haven't found a way to vaccinate a modem
        against the virus, but there is the possibility of building a
        subcarrier filter. I am calling on a 1200 baud modem to enter this
        message, and have advised the sysops of the two other boards
        (names withheld). I don't know how this virus originated, but I'm
        sure it is the work of someone in the computer telecommunications
        field such as myself. Probably the best thing to do now is to
        stick to 1200 baud until we figure this thing out.
 
        Mike RoChenle
This bogus virus description spawned a humorous alert by Robert Morris III :
        Date: 11-31-88 (24:60) Number: 32769
        To: ALL Refer#: NONE
        From: ROBERT MORRIS III Read: (N/A)
        Subj: VIRUS ALERT      Status: PUBLIC MESSAGE
 
        Warning: There's a new virus on the loose that's worse than
        anything I've seen before! It gets in through the power line,
        riding on the powerline 60 Hz subcarrier. It works by changing the
        serial port
 pinouts, and by reversing the direction one's disks
        spin. Over 300,000 systems have been hit by it here in Murphy,
        West Dakota alone! And that's just in the last 12 minutes.
 
        It attacks DOS, Unix, TOPS-20, Apple-II, VMS, MVS, Multics, Mac,
        RSX-11, ITS, TRS-80, and VHS systems.
 
        To prevent the spresd of the worm:
 
        1) Don't use the powerline.
        2) Don't use batteries either, since there are rumors that this
          virus has invaded most major battery plants and is infecting the
          positive poles of the batteries. (You might try hooking up just
          the negative pole.)
        3) Don't upload or download files.
        4) Don't store files on floppy disks or hard disks.
        5) Don't read messages. Not even this one!
        6) Don't use serial ports, modems, or phone lines.
        7) Don't use keyboards, screens, or printers.
        8) Don't use switches, CPUs, memories, microprocessors, or
          mainframes.
        9) Don't use electric lights, electric or gas heat or
         
 airconditioning, running water, writing, fire, clothing or the
          wheel.
 
        I'm sure if we are all careful to follow these 9 easy steps, this
        virus can be eradicated, and the precious electronic flui9ds of
        our computers can be kept pure.
 
        ---RTM III
Since that time virus hoaxes have flooded the Internet.With thousands of viruses worldwide, virus paranoia in the community has risen to an extremely high level. It is this paranoia that fuels virus hoaxes. A good example of this behavior is the "Good Times" virus hoax which started in 1994 and is still circulating the Internet today. Instead of spreading from one computer to another by itself, Good Times relies on people to pass it along.
How to Avoid Hoax Messages?
Posted By:jasmin On 2/10/2007

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