Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (16) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (17) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (18) .
As administrators seek to block dangerous email attachments through the recognition of well-known (19) , 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 and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (20) access to your network.
A．cracker
B．user
C．customer
D．client
参考答案：A
解析：
[分析]： Melissa病毒和LoveLetter病毒充分利用了朋友和同事之间的信任。想象一下这种情况：你的朋友发一个附件给你，要你打开它。Melissa和其他类似的蠕虫病毒都采用的是这种手段。一旦你运行了这些病毒程序，蠕虫就会继续把自己发送到你的邮件地址。薄、以前接收的邮件，以及网页缓冲中。
当管理员试图用已知的扩展名来阻止危险的E-mail附件时，病毒的编写者就会使用其他的扩展名来保护。可执行文件(*.exe)被重命名成为．bat、.cmd等等其他的扩展名。这些病毒文件同样会被运行，然后成功地入侵目标用户。
通常，黑客会使用一个类似于flash的附件来入侵网络，这些flash通常会在播放一些可爱动画的同时，在后台窃取你的密码并把破解文件植入你的网络。