42● Melissa and LoveLetter made use of the trust that exists between friends or colleagues.Imagine receiving an （71） from a friend who asks you to open it. This is what happens withMelissa and several other similar email （72） . Upon running, such worms usually proceed tosend themselves out to email addresses from the victim's address book, previous emails, webpages （73） . As administrators seek to block dangerous email attachments through the recognition ofwell-known （74） , virus writers use other extensions to circumvent such protection.Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions andwill still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like aflash movie, which, while displaying some cute animation, simultaneously runs commands inthe background to steal your passwords and give the （75） access to your network.
A.attachment
B.packet
C.datagram
D.message
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