Text 1 Virus Introduction
Viruses will cause much confusion. Even some virus “experts” will misinform the cause of the virus. Let's define what we mean by virus.
A virus is a program that reproduces its own code by attaching itself to other executable files, so the virus code is executed when the infected executable file is executed. Here, the program (COM or EXE file) refers to an executable file. To attach might mean physically adding to the end of a file, inserting into the middle of a file, or simply placing a pointer to a different location on the disk somewhere where the virus can find it.
Most viruses place self-replicating codes in other programs, so that when those other programs are executed, even more programs are "infected" with the self-replicating codes. These self-replicating codes, when caused by some event, may do a potentially harmful act to your computer.
The macro portion of a data file maybe much more critical (e.g., a Microsoft Word document), but less obvious. More recently, scripts written for Internet web sites and/or included in E-mail can also be executed and infected. Similar to viruses, you can also find malicious codes in Trojan Horses, worms, and logic bombs.
1．
計算機病毒介紹
病毒是導(dǎo)致很多問題產(chǎn)生的一個原因，甚至有些專家也會對病毒的產(chǎn)生產(chǎn)生誤解。首先讓我們定義一下我們所說的病毒：
病毒就是一個能夠通過把自身附加到可執(zhí)行文件之后來復(fù)制其自身代碼的程序，通過這種方式可以使得被感染的可執(zhí)行文件執(zhí)行時，病毒代碼也能夠被執(zhí)行。這里的“程序”（COM或EXE文件）指的是一個可執(zhí)行文件。附加可能指的是物理地添加到一個文件的尾部，插入到一個文件的中間，或者只是簡單地將指針放置到病毒可以在磁盤中找到的某處的不同位置。
許多病毒將可自復(fù)制的代碼放置到其他程序。這樣當(dāng)被感染的程序被執(zhí)行時，更多的程序就被這些可自復(fù)制的代碼感染了。當(dāng)這些自復(fù)制代碼被一些事件觸發(fā)時，或許會做出一些對你的計算機有潛在危害的行為。數(shù)據(jù)文件的宏部分（如微軟的word文件）可能是更具危害性但不易被發(fā)現(xiàn)的病毒?，F(xiàn)在，為網(wǎng)站編寫的或者包括在E-mail中的腳本也能夠被執(zhí)行和感染。與病毒相似，你可以從特洛伊木馬、蠕蟲和邏輯炸彈中找到惡意代碼。