Why are
chain letters a problem?
The most serious
problem is from chain letters that mask viruses or
other malicious activity. But even the ones that seem harmless may have
negative repercussions if you forward them:
- they
consume bandwidth or space within the recipient's inbox
- you force people you know to waste time sifting through the
messages and possibly taking time to verify the information
- you are spreading hype and, often, unnecessary fear and
paranoia
What are
some types of chain letters?
There are two main
types of chain letters:
- Hoaxes
- Hoaxes attempt to trick or defraud users. A hoax
could be malicious, instructing users to delete a file necessary to
the operating system by claiming it is a virus. It could also be a
scam that convinces users to send money or personal
information. Phishing attacks could fall into this category (see Avoiding
Social
Engineering and Phishing Attacks for more information).
- Urban
legends - Urban legends are designed to be
redistributed and usually warn users of a threat or claim to be
notifying them of important or urgent information. Another common form
are the emails that promise users monetary rewards for forwarding the
message or suggest that they are signing something that will be
submitted to a particular group. Urban legends usually have no
negative effect aside from wasted bandwidth and time.
How can you
tell if the email is a hoax or urban legend?
Some messages are more
suspicious than others, but be especially
cautious if the message has any of the characteristics listed
below. These characteristics are just guidelines—not every
hoax or
urban legend has these attributes, and some legitimate messages may
have some of these characteristics:
- it
suggests tragic consequences for not performing some action
- it promises money or gift certificates for performing some
action
- it offers instructions or attachments claiming to protect
you from
a virus that is undetected by anti-virus software
- it claims it's not a hoax
- there are multiple spelling or grammatical errors, or the
logic is
contradictory
- there is a statement urging you to forward the message
- it has already been forwarded multiple times (evident from
the
trail of email headers in the body of the message)
If you want
to check the validity of an email, there are some web
sites that provide information about hoaxes and urban legends:
Authors: Mindi
McDowell, Allen Householder
Copyright
2004 Carnegie Mellon University.
