Klez (Klez) virus milestone. The virus first appeared in 2001, after a few months a number of variants. The most common cover letter by mail to spread viruses, and then self-replicate, and where the victims address book to send the same e-mail contacts.
Some variants of Klez or even fatal damage will be computer generated. According to versions, cover letter virus can be divided into ordinary viruses, worms or Trojan horses. Some may even be forced to close or disguised as antivirus software virus removal tool [Data: Symantec].
Klez soon appear on the network, hackers it has been improved to make it more contagious. With many viruses, the virus will use the cover letter to contact the victim's address book to send the same message. In addition, it contacts from the poisoning in a randomly selected person, fill in the e-mail address location of the sender. This is the e-mail address spoofing - seems the message is sent one of your acquaintances, but they are actually other human hair.
E-mail address is disguised in order to achieve the following purposes. First of all, to prevent the sender even if the recipient is useless, because the message is sent by other people. Second, users can not distinguish whether a message is spam, Klez will result in the recipient mailbox to plug in a short time. Also, because the sender is a mailing list, contact, many people will open the message and lead poisoning.
In 2001 there are several very powerful computer virus, the next section we will learn that in 2001 with the emergence of another kind of virus - Code Red.
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