computer virus
计算机病毒的名词解释
计算机病毒的名词解释计算机病毒(computervirus，简称：电脑病毒)是一种专门潜伏在计算机程序中，等待机会，然后通过修改程序代码的方式将自己再次安装到其它程序中的恶意程序。
由于某些原因，它们不能再生成其自身的拷贝。
但是它可以将自身附着在其他的程序上面，并利用这些程序运行时的信息进行复制和传播，这样它就会在这些程序所控制的系统中蔓延开来。
例如，每个盗版光盘上都带有这样一种病毒，它们可以在光驱中一张一张地复制自身到光盘的每一面上去，甚至还可以感染操作系统，把自身写入系统文件里面去。
如果我们用计算机打开那些盗版光盘的话，计算机就会被这种病毒感染而染上病毒。
计算机病毒(computervirus，简称：电脑病毒)是一种专门潜伏在计算机程序中，等待机会，然后通过修改程序代码的方式将自己再次安装到其它程序中的恶意程序。
由于某些原因，它们不能再生成其自身的拷贝。
但是它可以将自身附着在其他的程序上面，并利用这些程序运行时的信息进行复制和传播，这样它就会在这些程序所控制的系统中蔓延开来。
例如，每个盗版光盘上都带有这样一种病毒，它们可以在光驱中一张一张地复制自身到光盘的每一面上去，甚至还可以感染操作系统，把自身写入系统文件里面去。
如果我们用计算机打开那些盗版光盘的话，计算机就会被这种病毒感染而染上病毒。
(computervirus，简称：电脑病毒)是一种专门潜伏在计算机程序中，等待机会，然后通过修改程序代码的方式将自己再次安装到其它程序中的恶意程序。
由于某些原因，它们不能再生成其自身的拷贝。
但是它可以将自身附着在其他的程序上面，并利用这些程序运行时的信息进行复制和传播，这样它就会在这些程序所控制的系统中蔓延开来。
例如，每个盗版光盘上都带有这样一种病毒，它们可以在光驱中一张一张地复制自身到光盘的每一面上去，甚至还可以感染操作系统，把自身写入系统文件里面去。
如果我们用计算机打开那些盗版光盘的话，计算机就会被这种病毒感染而染上病毒。
Computer Virus教案
Computer Virus——计算机英语教学设计教材分析：本节课教学内容为计算机病毒。
病毒是计算机专业学生需要掌握的专业内容，随着社会的发展，电脑病毒也日趋猖狂，作为一个计算机专业的人员，需要对电脑病毒有所了解，并且能做出正确的反应，采取合理的措施。
由于国际交流的频繁，计算机专业学生对于这方面的英语也应该有一定程度的掌握，因此要求学生学习并掌握计算机病毒相关的英语词汇。
本课内容针对职高计算机专业学生，内容由低起点开始，由浅入深，循序渐进，语言生动活泼，话题与学生生活及未来岗位息息相关，能吸引学生学习的兴趣，有利于学生了解并掌握日常生活中常见的病毒类型和杀毒软件。
学情分析：计算机专业学生是在高二学习计算机专业英语的，该程度学生英语基础相对薄弱，英语学习兴趣匮乏，但是又需要对该专业相关内容的英语知识有一定的了解，因此选择合适的教材，采取合理的教学方式很重要。
教学目标：Knowledge objectives:1. Get to know what computer virus is.2. Get to know some kinds of computer virus.3. Get to know some anti-virus softwares and their homepage addresses. Ability objectives:Improve students’ speaking and reading ability.Emotional objectives:Arouse students’ interest in computer English.教学重点和难点：Teaching important points:1.Understand the text.2.Talk about computer virus.Teaching difficult points:Talk about computer virus.教法和学法：以“学为主体、教为主导”为原则，以主题为线索，以任务为驱动，通过多样化的教学资源和教学形态、以模块化的教学模式，互动式的学习方式，网络和多媒体等现代化的教学手段，培养学生的职业素质，进而成为与信息行业要求相适应的综合能力较强、符合行业需求的高素质专门人才。
几种常见的病毒和勒索病毒
一，简介计算机病毒（Computer Virus）是编制者在计算机程序中插入的破坏计算机功能或者数据的代码，能影响计算机使用，能自我复制的一组计算机指令或者程序代码。
计算机病毒具有传播性、隐蔽性、感染性、潜伏性、可激发性、表现性或破坏性。
计算机病毒的生命周期：开发期→传染期→潜伏期→发作期→发现期→消化期→消亡期。
计算机病毒是一个程序，一段可执行码。
就像生物病毒一样，具有自我繁殖、互相传染以及激活再生等生物病毒特征。
计算机病毒有独特的复制能力，它们能够快速蔓延，又常常难以根除。
它们能把自身附着在各种类型的文件上，当文件被复制或从一个用户传送到另一个用户时，它们就随同文件一起蔓延开来。
二，几种常见的病毒1，木马病毒：指通过特定的程序（木马程序）来控制另一台计算机。
木马通常有两个可执行程序：一个是控制端，另一个是被控制端。
木马这个名字来源于古希腊传说（荷马史诗中木马计的故事，Trojan一词的特洛伊木马本意是特洛伊的，即代指特洛伊木马，也就是木马计的故事）。
“木马”程序是目前比较流行的病毒文件，与一般的病毒不同，它不会自我繁殖，也并不“刻意”地去感染其他文件，它通过将自身伪装吸引用户下载执行，向施种木马者提供打开被种主机的门户，使施种者可以任意毁坏、窃取被种者的文件，甚至远程操控被种主机。
木马病毒的产生严重危害着现代网络的安全运行。
（1）：特征：1、隐蔽性是其首要的特征如其它所有的病毒一样，木马也是一种病毒，它必需隐藏在你的系统之中，它会想尽一切办法不让你发现它。
很多人的对木马和远程控制软件有点分不清，因为我前面讲了木马程序就要通过木马程序驻留目标机器后通过远程控制功能控制目标机器。
实际上他们两者的最大区别就是在于这一点，举个例子来说吧，象我们进行局域网间通讯的常软件——PCanywhere大家一定不陌生吧，大家也知道它是一款远程通讯软件。
PCanwhere在服务器端运行时，客户端与服务器端连接成功后客户端机上会出现很醒目的提示标志。
计算机病毒发展的现状
计算机病毒发展的现状随着电脑不断地影响我们的生活，电脑病毒也随着各种网络，磁盘等等日新月异的方式企图入侵我们的家用电脑、公司电脑，严重影响了我们使用计算机与网络。
下面是店铺收集整理的计算机病毒发展的现状，希望对大家有帮助~~计算机病毒发展的现状计算机病毒(Computer Virus)是指编制或在计算机程序中插入破坏计算机功能或毁坏数据，影响计算机使用并能自我复制的一种指令或程序代码。
它具有可隐藏性、可传播性、可潜伏性、可激发性和巨大危害性等特征。
特别是在网络环境下，计算机病毒更易于传播，其危害性更大。
因而，本文试图从这一角度出发探讨在网络环境下制作、传播计算机病毒犯罪的现状、成因及因此应采取的立法对策。
一、网络环境下制作、传播计算机病毒犯罪的现状计算机病毒最早产生于美国电报电话公司的贝尔实验室，目前全世界已发现的计算机病毒已达上万种之多。
我国自1989年发现病毒，迄今已发现的病毒数以千计，其中也有许多“国产”病毒。
随着计算机网络技术的发展，网络在提供信息共享与便捷的同时，也为计算机病毒的传播提供了良好的环境，因而其破坏性更为巨大。
在当今网络环境下计算机病毒的犯罪趋势主要表现为：1.计算机病毒犯罪在网络环境下带来的经济损失呈上升趋势。
计算机病毒产生之初，人们对其危害性往往认识不清，自1988年下半年莫里斯(Morris)制作的“因特网蠕虫”病毒致使美国军方计算机网络全面瘫痪，其经济损失达六千万美元后，人们才开始关注它。
随着网络的民用化，网络取得了突飞猛进的发展，给人们带来信息的便利，展示了21世纪信息社会的巨大魅力。
但计算机病毒似乎与网络“形影相连”，给人们巨大的警示：网络不是净土。
1999年“曼里沙”(Melissa)病毒借助英特网通过电子邮件而造成全世界大批网络瘫痪。
同年4月26日爆发的“CIH”病毒对全球六千多万台计算机造成严重损害，仅我国的经济损失便超过亿元人民币。
2000年5月4日“爱虫”病毒再次泛滥全球，其经济损失高达百亿美元。
l计算机病毒(英文)ppt课件
好 多 种
系统病毒
Win32、PE
捆绑机病毒 Binder
下载者病毒 downloader
精品ppt
9
How do viruses spread?
● over execute program
精品ppt
10
● over a network.
网页要求安装 外挂程序
精品ppt
11
● over flash memory
破坏计算机功能或者毁坏数据，影响计算机使用，并能自我复制的一组计算机 指令或者程序代码。 《中华人民共和国计算机信息系统安全保护条例》第二十八条
精品ppt
3
MYDOOM, 电邮蠕虫病毒
精品ppt
4
精品ppt
PHISHING 网络钓鱼
5
精品ppt
灰鸽子Gray pigeons
6
What is a computer virus?
精品ppt
16
Some general tips on avoiding virus infection
●To data important files backup ●Install anti-virus software ●scanning for viruses on a regular
什么叫计算机病毒
什么叫计算机病毒电脑中出现病毒的情况是很多的，当这种情况出现后，我们就需要对电脑做出相关的处理，否则就会影响我们的电脑使用。
下面是店铺收集整理的什么叫计算机病毒，希望对大家有帮助~~什么叫计算机病毒编制或者在计算机程序中插入的破坏计算机功能或者破坏数据，影响计算机使用并且能够自我复制的一组计算机指令或者程序代码被称为计算机病毒(Computer Virus)。
具有破坏性，复制性和传染性。
快速导航知乎精选中文名电脑病毒别名计算机病毒应用行业IT业外文名Computervirus分类繁殖性、破坏性、传染性、潜伏性、隐蔽性、触发性概况知乎精选最新目录1声明2法律定义3定义4预防5产生6特点寄生性传染性隐蔽性破坏性可触发性7分类前言存在的媒体传染的方法破坏的能力病毒的算法8发展DOS引导阶段DOS可执行阶段批次型阶段多形阶段变体机阶段网络蠕虫阶段视窗阶段宏病毒阶段互联网阶段邮件炸弹阶段9行为10危害11症状12出现13检查14方式命名途径传染过程15种类系统病毒蠕虫病毒黑客病毒脚本病毒宏病毒后门病毒种植程序病毒破坏性程序病毒玩笑病毒捆绑机病毒16相关17事件18注意19处理20相关介绍21病毒的老祖宗22电脑系统中毒后怎么办1声明编辑作为一名医学工作者再次声明“病毒”与计算机病毒不是同义词，“计算机病毒”只是用生物“病毒”作比喻，请在百科中完善病毒词条的相关内容分布，并让使用者在搜索时能获得全面信息。
计算机病毒(Computer Virus)在《中华人民共和国计算机信息系统安全保护条例》中被明确定义，病毒指“编制者在计算机程序中插入的破坏计算机功能或者破坏数据，影响计算机使用并且能够自我复制的一组计算机指令或者程序代码”。
与医学上的“病毒”不同，计算机病毒不是天然存在的，是某些人利用计算机软件和硬件所固有的脆弱性编制的一组指令集或程序代码。
它能通过某种途径潜伏在计算机的存储介质(或程序)里，当达到某种条件时即被激活，通过修改其他程序的方法将自己的精确拷贝或者可能演化的形式放入其他程序中。
全球十大计算机病毒
全球十大计算机病毒计算机病毒(Computer Virus)是编制者在计算机程序中插入的破坏计算机功能或者数据的代码，能影响计算机使用，能自我复制的一组计算机指令或者程序代码。
下面是店铺跟大家分享的是全球十大计算机病毒，欢迎大家来阅读学习。
全球十大计算机病毒NO.1 “CIH病毒”爆发年限:1998年6月CIH病毒(1998年)是一位名叫陈盈豪的台湾大学生所编写的，从中国台湾传入大陆地区的。
CIH的载体是一个名为“ICQ中文Ch_at模块”的工具，并以热门盗版光盘游戏如“古墓奇兵”或Windows95/98为媒介，经互联网各网站互相转载，使其迅速传播。
CIH病毒属文件型病毒，其别名有Win95.CIH、Spacefiller、Win32.CIH、PE_CIH，它主要感染Windows95/98下的可执行文件(PE格式，Portable Executable Format)，目前的版本不感染DOS以及WIN 3.X(NE格式，Windows and OS/2 Windows 3.1 execution File Format)下的可执行文件，并且在Win NT中无效。
其发展过程经历了v1.0，v1.1、v1.2、v1.3、v1.4总共5个版本。
损失估计：全球约5亿美元NO.2 “梅利莎(Melissa)”爆发年限:1999年3月梅利莎(1999年)是通过微软的Outlook电子邮件软件，向用户通讯簿名单中的50位联系人发送邮件来传播自身。
该邮件包含以下这句话：“这就是你请求的文档，不要给别人看”，此外夹带一个Word 文档附件。
而单击这个文件，就会使病毒感染主机并且重复自我复制。
1999年3月26日，星期五，W97M/梅利莎登上了全球各地报纸的头版。
估计数字显示，这个Word宏脚本病毒感染了全球15%~20%的商用PC。
病毒传播速度之快令英特尔公司(Intel)、微软公司(Microsoft，下称微软)、以及其他许多使用Outlook软件的公司措手不及，防止损害，他们被迫关闭整个电子邮件系统。
计算机病毒基础知识大全科普
计算机病毒基础知识大全科普计算机病毒(Computer Virus)是编制者在计算机程序中插入的破坏计算机功能或者数据的代码，能影响计算机使用，能自我复制的一组计算机指令或者程序代码。
下面就让小编带你去看看计算机病毒基础知识大全，希望能帮助到大家!计算机病毒计算机病毒是指编制或者在计算机程序中插入的,破坏计算机功能或数据、影响计算机使用, 并能自我复制的一组计算机指令或者程序代码。
1.计算机病毒的特点电脑病毒的主要特点如下。
(1)隐蔽性电脑病毒的隐蔽性使得人们不容易发现它，例如有的病毒要等到某个月13日且是星期五才发作，平时的日子不发作。
一台电脑或者一张软盘被感染上病毒一般是无法事先知道的，病毒程序是一个没有文件名的程序。
(2)潜伏性从被感染上电脑病毒到电脑病毒开始运行，一般是需要经过一段时间的。
当满足病毒发作的指定环境条件时，病毒程序才开始发作。
(3)传染性电脑病毒程序的一个主要特点是能够将自身的程序复制给其他程序(文件型病毒)，或者放入指定的位置，如引导扇区(引导型病毒)。
(4)欺骗性每个电脑病毒都具有特洛伊木马的特点，用欺骗手段寄生在其他文件上，一旦该文件被加载，就会让病毒发作并破坏电脑的软、硬件资源，迫使电脑无法正常工作。
(5)危害性病毒的危害性是显然的，几乎没有一个无害的病毒。
它的危害性不仅体现在破坏系统，删除或者修改数据方面，而且还要占用系统资源，干扰机器的正常运行等。
2.计算机病毒的分类2.1按传染方式分类病毒按传染方式可分为:1).引导区电脑病毒2).文件型电脑病毒3).复合型电脑病毒4).宏病毒5).木马6).蠕虫1).引导区电脑病毒：隐藏在磁盘内，在系统文件启动以前电脑病毒已驻留在内存内。
这样一来，电脑病毒就可完全控制DOS中断功能，以便进行病毒传播和破坏活动。
那些设计在DOS或Windows3.1上执行的引导区病毒是不能够在新的电脑操作系统上传播。
2).文件型电脑病毒又称寄生病毒，通常感染执行文件(.E__E)，但是也有些会感染其它可执行文件，如DLL,SCR等。
电脑病毒英文作文
电脑病毒英文作文英文：Computer viruses are a serious problem in today's world. They can cause significant damage to your computer and even steal personal information. I have had personal experience with a computer virus and it was not a pleasant one. My computer started running slowly and strange pop-ups started appearing on my screen. I knew something was wrong and rana virus scan, only to find out that my computer wasinfected with a virus.The virus had infected several of my important filesand I had to spend hours trying to remove it. It was a frustrating and time-consuming process that could have been avoided if I had taken better precautions. Nowadays, I make sure to regularly update my antivirus software and avoid downloading files from untrusted sources.In addition to personal experience, I have also seenthe impact of computer viruses on a larger scale. For example, the WannaCry ransomware attack in 2017 affected thousands of computers worldwide and caused significant damage. It is important to take computer viruses seriously and take steps to protect yourself and your devices.中文：电脑病毒是当今世界上的一个严重问题。
电子商务安全技术 第09章 计算机病毒的产生与预防
特洛伊木马（Trojan Horse）
概述：特洛伊木马是一种或是直接由一个黑客，或
是通过一个不令人起疑的用户秘密安装到目标系统的 程序。一旦安装成功并取得管理员权限，安装此程序 的人就可以直接远程控制目标系统。
特点：
隐蔽性，难以察觉 客户端/服务器模式
特洛伊木马（Trojan Horse）
分类：
远程访问型 密码发送型 键盘记录型 综合型
著名木马：
国外——BO(Back Orifice) 端口31337
国内——冰河
端口7626
特洛伊木马（Trojan Horse）
防御：用网络扫描软件定期监视内部主机上的TCP 服务，定期检查注册表，定期用防病毒软件查杀等。
宏病毒的特征：
宏病毒会感染.DOC文档和.DOT模板文件。
宏病毒的传染通常是Word在打开一个带宏病毒的文 档或模板时，激活宏病毒。
多数宏病毒包含AutoExec、AutoOpen和AutoNew等 自动宏，通过这些自动宏病毒取得文档（模板）操 作权。
宏病毒（Macro Virus）
计算机病毒的发展历史
“磁芯大战”（core war）——60年代，贝尔实验室
Douglas Mcllroy、Victor Vysottsky以及Robert T.Morris
1983年，世界上第一例被证实的计算机病毒，同时出
现了计算机病毒传播的研究报告
1984年，美国人Thompson开发出了针对UNIX操作
窃取密码等
计算机病毒的传播途径
软盘——软盘作为最常用的交换媒介，在计算机应用
计算机病毒-Coremail邮件系统
下面是重点哦：
如何检查笔记本是否中了病毒
？
检查步骤：
1. 首先排查的就是进程了，方法简单，开机后，什么都 不要启动！ 第一步：直接打开任务管理器，查看有没有可疑的有没有隐藏进程（冰 刃中以红色标出），然后查看系统进程的路径是否正确。 第三步：如果进程全部正常，则利用Wsyscheck等工具， 查看是否有可疑的线程注入到正常进程中。
“蠕虫”型病毒：通过计算机网络传播，不改变文件和资料信息，利用网络从
一台机器的内存传播到其它机器的内存，计算网络地址，将自身的病毒通过网络发 送。有时它们在系统存在，一般除了内存不占用其它资源。
附在系统的引导扇区或文件中，通过系统的功能进行传播，按其算法不同可分为： 练习型病毒，病毒自身包含错误，不能进行很好的传播，例如一些病毒在调试阶段。 诡秘型病毒：它们一般不直接修改DOS中断和扇区数据，而是通过设备技术和 文件缓冲区等DOS内部修改，不易看到资源，使用比较高级的技术。利用DOS空闲 的数据区进行工作。
3. ADSL用户，在这个时候可以进行虚拟拨号，连接到Internet了。然 后直接用冰刃的网络连接查看，是否有可疑的连接，对于IP地址如 果发现异常，不要着急，关掉系统中可能使用网络的程序（如迅雷 等下载软件、杀毒软件的自动更新程序、IE浏览器等），再次查看 网络连接信息。 4. 如果开机以后，系统运行缓慢，还可以用CPU时间做参考，找到可 疑进程，方法如下： 打开任务管理器，切换到进程选项卡，在菜单中点“查看”，“选 择列”，勾选“CPU时间”，然后确定，单击CPU时间的标题， 进行排序，寻找除了SystemIdleProcess和SYSTEM以外，CPU时 间较大的进程，这个进程需要引起一定的警惕。
寄生型病毒：除了伴随和“蠕虫”型，其它病毒均可称为寄生型病毒，它们依
关于计算机病毒的英文文献和翻译
英文COMPUTER VIRUSESWhat are computer viruses?According to Fred Cohen’s well-known definition, a computer virus is a computer program that can infect other computer programs by modifying them in such a way as to include a (possibly evolved) copy of itself. Note that a program does not have to perform outright damage (such as deleting or corrupting files) in order to be called a “virus”. However, Cohen uses the terms within his definition (e.g. “program” and “modify”) a bit differently from the way most an ti-virus researchers use them, and classifies as viruses some things which most of us would not consider viruses. Computer viruses are bits of code that damage or erase information, files, or software programs in your computer, much like viruses that infect humans, computer viruses can spread, and your computer can catch a virus when you download an infected file from the Internet or copy an infected file from a diskette. Once the viruses is embedded into your computer’s files, it can immediately start to d amage or destroy information, or it can wait for a particular date or event to trigger its activity.What are the main types of viruses?Generally, there are two main classes of viruses. The first class consists of the file Infectors which attach themselves to ordinary program files. These usually infect arbitrary .COM and/or .EXE programs, though some can infect any program for which execution is requested, such as .SYS,.OVL,.PRG,&.MNU files.File infectors can be either direct action or resident. A direct-action virus selects one or more other programs to infect each other time the program which contains it is executed ,and thereafter infects other programs when “they” are executed (as in the case of the Jerusalem) or when certain other conditions are fulfilled. The Vienna is an example of a direct-action virus. Most other viruses are resident.The second class is system or boot-record infectors: those viruses, which infect executable code, found in certain system areas on a disk that are not ordinary files. On DOS systems, there are ordinary boot-sector viruses, which infect only the DOS boot sector on diskettes. Examples include Brain, Stoned, Empire, Azusa, and Michelangelo. Such viruses are always resident viruses.Finally, a few viruses are able to infect both (the Tequila virus is one example). There are often called “multipartite” viruses, though there has been criticism of this name; another name is “boot-and -file” virus.File system or cluster viruses (e.g. Dir-II) are those that modify directory table entries so that the virus is loaded and executed before the desired program is. Note that the program itself is not physically altered; only the directory entry is. Some consider these infectors to be a third category of viruses, while others consider them to be a sub-category of the file infectors.What are macro viruses?Many applications provide the functionality to create macros. A macro is a series of commands to perform some application-specific task. Macros are designed to makelife easier, for example, to perform some everyday tasks like text-formatting or spreadsheet calculations.Macros can be saved as a series of keystrokes (the application record what keys you press); or they can be written in special macro languages (usually based on real programming languages like C and BASIC). Modern applications combine both approaches; and their advanced macro languages are as complex as general purpose programming languages. When the macro language allows files to be modified, it becomes possible to create macros that copy themselves from one file to another. Such self-replicating macros are called macro viruses.Most macro viruses run under Word for Windows. Since this is a very popular word processor, it provides an effective means for viruses to spread. Most macro viruses are written using the macro language WordBasic. WordBasic is based on the good old BASIC programming language. However, it has many (hundreds of) extensions (for example, to deal with documents: edit, replace string, obtain the name of the current document, open new window, move cursor, etc.).What is a Trojan horse program?A type of program that is often confused with viruses is a ‘Trojan horse’ program. This is not a virus, but simply a program (often harmful) that pretends to be something else.For example, you might download what you think is a new game; but when you run it, it deletes files on your hard drive. Or the third time you start the game, the program E-mail your saved passwords to another person.Note: simply download a f ile to your computer won’t activate a virus or Trojan horse; you have to execute the code in the file to trigger it. This could mean running a program file, or opening a Word/Excel document in a program (such as Word or Excel) that can execute any macros in the document.What kind of files can spread viruses?Viruses have the potential to infect any type of executable code, not just the files that are commonly called “program files”. For example, some viruses infect executable code in the boot sector of floppy disk or in system areas of hard drives. Another type of virus, known as a “macro” virus, can infect word processing and spreadsheet documents that use macros. And it’s possible for HTML documents containing JavaScript or other types of executable code to spread viruses or other malicious code. Since viruses code must be executed to have any effect, files that the computer treats as pure data are safe. This includes graphics and sound files such as .gif, .jpg, .mp3, .wav, .etc., as well as plain text in .txt files. For example, just viewing picture files won’t infect your computer with a virus. The virus code has to be in a form, such as an .exe program file or a Word .doc file which the computer will actually try to execute.How do viruses spread?The methodology of virus infection was pretty straightforward when first computer viruses such as Lehigh and Jerusalem started appearing. A virus is a small piece of computer code, usually form several bytes to a few tens of bytes, that can do, well, something unexpected. Such viruses attach themselves to executable files— programs,so that the infected program, before proceeding with whatever tasks it is supposed to do, calls the virus code. One of the simplest ways to accomplish that is to append the virus code to the end of the file, and insert a command to the beginning of the program file that would jump right to the beginning of the virus code. After the virus is finished, it jumps back to the point of origination in the program. Such viruses were very popular in the late eighties. The earlier ones only knew how to attach themselves to .Com files, since structure of a .COM file is much simpler than that of an .EXE file—yet another executable file format invented for MS-DOS operating system. The first virus to be closely studied was the Lehigh virus. It attached itself to the file that was loaded by the system at boot time—. the virus did a lot of damage to its host, so after three-four replications it was no longer usable. For that reason, the virus never managed to escape the university network.When you execute program code that’s infected by a virus, the virus code will also run and try to infect other programs, either on the same computer or on other computers connected to it over a network. And the newly infected programs will try to infect yet more programs.When you share a copy of an infected file with other computer users, running the file may also infect their computer; and files from those computers may spread the infection to yet more computers.If your computer if infected with a boot sector virus, the virus tries to write copies of itself to the system areas of floppy disks and hard disks. Then the infected floppy disks may infect other computers that boot from them, and the virus copy on the hard disk will try to infect still more floppies.Some viruses, known as ‘multipartite’ viruses, and spread both by infecting files and by infecting the boot areas of floppy disks.What do viruses do to computers?Viruses are software programs, and they can do the same things as any other program running on a computer. The accrual effect of any particular virus depends on how it was programmed by the person who wrote the virus.Some viruses are deliberately designed to damage files or otherwise interfere with your computer’s operation, while other don’t do anything but try to spread themselves around. But even the ones that just spread themselves are harmful, since they damage files and may cause other problems in the process of spreading.Note that vir uses can’t do any damage to hardware: they won’t melt down your CPU, burn out your hard drive, cause your monitor to explode, etc. warnings about viruses that will physically destroy your computer are usually hoaxes, not legitimate virus warnings.Modern viruses can exist on any system form MS DOS and Window 3.1 to MacOS, UNIX, OS/2, Windows NT. Some are harmless, though hard to catch. They can play a jingle on Christmas or reboot your computer occasionally. Other are more dangerous. They can delete or corrupt your files, format hard drives, or do something of that sort. There are some deadly ones that can spread over networks with or without a host, transmit sensitive information over the network to a third party, or even mess with financial data on-line.W hat’s the story on viruses and E-mail?You can’t get a virus just by reading a plain-text E-mail message or Usenet post. What you have to watch out for are encoded message containing embedded executable code (i.e., JavaScript in HTML message) or message that include an executable file attachment (i.e., an encoded program file or a Word document containing macros).In order to activate a virus or Trojan horse program, you computer has to execute some type of code .This could be a program attached to an E-mail, a Word document you downloaded from the Internet, or something received on a floppy disk. There’s no special hazard in files attached to Usenet posts or E-mail messages: they’re no more dangerous than any other file.What can I do to reduce the chance of getting viruses from E-mail？Treat any file attachments that might contain executable code as carefully as you would any other new files: save the attachment to disk and then check it with an up-to-date virus scanner before opening the file.If you E-mail or news software has the ability to automatically execute JavaScript, Word macros, or other executable code contained in or attached to a message, I strongly recommend that you disable this feature.My personal feeling is that if an executable file shows up unexpectedly attached to an E-mail, you should delete it unless you can positively verify what it is, Who it came from, and why it was sent to you.The recent outbreak of the Melissa virus was a vivid demonstration of the need to be extremely careful when you receive E-mail with attached files or documents. Just because an E-mail appears to come from someone you trust, this does NOT mean the file is safe or that the supposed sender had anything to do with it.Some General Tips on Avoiding Virus InfectionsInstall anti-virus software from a well-known, reputable company. UPDATE it regularly, and USE it regularly.New viruses come out every single day; an a-v program that hasn’t been updated for several months will not provide much protection against current viruses.In addition to scanning for viruses on a regular basis, install an ‘on access’ scanner (included in most good a-v software packages) and configure it to start automatically each time you boot your system. This will protect your system by checking for viruses each time your computer accesses an executable file.Virus scans any new programs or other files that may contain executable code before you run or open them, no matter where they come from. There have been cases of commercially distributed floppy disks and CD-ROMs spreading virus infections.Anti-virus programs aren’t very good at detecting Trojan horse programs, so be extremely careful about opening binary files and Word/Excel documents from unknown or ‘dubious’ sources. This includes posts i n binary newsgroups, downloads from web/ftp sites that aren’t well-known or don’t have a good reputation, and executable files unexpectedly received as attachments to E-mail.Be extremely careful about accepting programs or other flies during on-line chat sessions: this seems to be one of the more common means that people wind up with virus or Trojan horse problems. And if any other family members (especially youngerones) use the computer, make sure they know not to accept any files while using chat. Do regular backups. Some viruses and Trojan horse programs will erase or corrupt files on your hard drive and a recent backup may be the only way to recover your data.Ideally, you should back up your entire system on a regular basis. If this isn’t practical, a t least backup files you can’t afford to lose or that would be difficult to replace: documents, bookmark files, address books, important E-mail, etc.Dealing with Virus InfectionsFirst, keep in mind “Nick’s First Law of Computer Virus Complaints”:“Just because your computer is acting strangely or one of your programs doesn’t work right, this does not mean that your computer has a virus.”If you haven’t used a good, up-to-date anti-virus program on your computer, do that first. Many problems blamed on viruses are actually caused by software configuration errors or other problems that have nothing to do with a virus.If you do get infected by a virus, follow the direction in your anti-virus program for cleaning it. If you have backup copies of the infected files, use those to restore the files. Check the files you restore to make sure your backups weren’t infected.for assistance, check the web site and support service for your anti-virus software. Note: in general, drastic measures such as formatting your hard drive or using FDISK should be avoided. They are frequently useless at cleaning a virus infection, and may do more harm than good unless you’ re very knowledgeable about the effects of the particular virus you’re dealing with.中文翻译计算机病毒什么是计算机病毒？按照Fred Cohen的广为流传的定义，计算机病毒是一种侵入其他计算机程序中的计算机程序，他通过修改其他的程序从而将（也可能是自身的变形）的复制品嵌入其中。
电脑病毒英语作文
Computer viruses are malicious software programs designed to infiltrate,damage,or perform unauthorized actions on a computer system.They can be spread through various means,such as email attachments,software downloads,and even through removable media like USB drives.One of the most common ways a computer virus can infect a system is through phishing emails.These are deceptive messages that appear to be from a trustworthy source but are actually designed to trick the recipient into clicking on a link or opening an attachment that contains the virus.Once activated,the virus can steal sensitive information,corrupt files,or even take control of the entire system.Another method of spreading viruses is through software downloads.Some websites may offer free software or updates that are infected with viruses.When a user downloads and installs this software,the virus is also installed,potentially causing damage to the system or stealing personal information.Removable media,such as USB drives,can also be a source of computer viruses.If a USB drive has been used on an infected computer,it can carry the virus to other systems when connected.This is why its important to always scan any new removable media for viruses before using it on your own computer.The effects of a computer virus can be devastating.They can cause data loss,system crashes,and even lead to identity theft.In some cases,viruses can even render a computer completely unusable,requiring a complete system wipe and reinstallation of the operating system.To protect against computer viruses,its important to have a reliable antivirus software installed on your system.This software can scan for and remove viruses before they have a chance to infect your system.Additionally,its crucial to practice safe computing habits, such as not opening suspicious emails or attachments,only downloading software from trusted sources,and regularly updating your system and software to protect against known vulnerabilities.In conclusion,computer viruses are a serious threat to the security and integrity of computer systems.By understanding how they spread and taking appropriate precautions, users can minimize the risk of infection and keep their systems safe.。
计算机病毒 英语 作文
计算机病毒英语作文Title: Understanding Computer Viruses。
Introduction:Computer viruses have become a significant concern in today's digital age. These malicious programs can cause extensive damage to computer systems and compromise sensitive information. Understanding what computer viruses are, how they work, and how to prevent them is crucial for safeguarding digital assets. In this essay, we will delve into the realm of computer viruses and explore various aspects related to them.Definition of Computer Virus:A computer virus is a type of malicious software program designed to infect a computer system and spread from one host to another. Unlike other types of malware, such as worms and trojans, viruses require humanintervention to propagate. They attach themselves to legitimate programs or files and execute their code whenthe infected program or file is run.Characteristics of Computer Viruses:1. Replication: One of the defining characteristics of computer viruses is their ability to replicate themselves. Once a computer system is infected, the virus can spread to other files or systems, thereby increasing its reach.2. Payload: Computer viruses often carry a payload, which is the malicious action they are designed to perform. This could range from displaying annoying pop-up messagesto deleting or corrupting files, stealing sensitive information, or even rendering the entire system inoperable.3. Stealthiness: Many viruses are designed to evade detection by antivirus software and other security measures. They may employ techniques such as encryption, polymorphism, or rootkit technology to conceal their presence and avoid being removed.4. Triggering Mechanism: Viruses typically have a triggering mechanism that determines when they activate their payload. This could be a specific date and time, the occurrence of certain system events, or user actions such as opening an infected file.Common Types of Computer Viruses:1. File Infectors: These viruses attach themselves to executable files, such as .exe or .dll files, and infect them. When the infected file is executed, the virus code is also executed, allowing the virus to spread further.2. Boot Sector Viruses: Boot sector viruses infect the master boot record (MBR) of a computer's hard drive or removable storage device. They activate when the infected system is booted, enabling them to spread to other systems through infected storage media.3. Macro Viruses: Macro viruses infect documents and spreadsheets that contain macros, such as those created inMicrosoft Word or Excel. When the infected document is opened, the virus code embedded in the macro is executed.4. Polymorphic Viruses: Polymorphic viruses are capable of changing their appearance each time they infect a new file or system, making them difficult to detect using traditional signature-based antivirus software.Impact of Computer Viruses:The impact of computer viruses can be severe and wide-ranging. They can cause financial losses due to data theft or destruction, disrupt business operations, and tarnish the reputation of individuals or organizations. In some cases, viruses can even pose a threat to national security if they target critical infrastructure or government systems.Prevention and Mitigation Strategies:1. Use Antivirus Software: Installing reputable antivirus software and keeping it up to date is essentialfor detecting and removing viruses from your computer system.2. Exercise Caution: Be cautious when downloading files from the internet or opening email attachments, especially if they are from unknown or untrusted sources.3. Keep Software Updated: Regularly update your operating system, web browser, and other software applications to patch known vulnerabilities that could be exploited by viruses.4. Enable Firewall Protection: Use a firewall to monitor and control incoming and outgoing network traffic, thereby preventing unauthorized access to your computer system.5. Backup Data Regularly: Implement a regular backup strategy to ensure that important files and data are securely backed up and can be restored in the event of a virus infection or data loss.Conclusion:In conclusion, computer viruses pose a significant threat to the security and integrity of computer systems worldwide. By understanding their characteristics, types, and impact, as well as implementing appropriate prevention and mitigation strategies, individuals and organizations can better protect themselves against this evolving threat landscape. Vigilance, education, and proactive security measures are key to combating the menace of computer viruses in the digital age.。
计算机病毒是指什么
计算机病毒是指什么
计算机病毒(Computer Virus)是编制者在计算机程序中插入的破坏计算机功能或者数据的代码，能影响计算机使用，能自我复制的一组计算机指令或者程序代码。
计算机病毒是一个程序，一段可执行码。
就像生物病毒一样，具有自我繁殖、互相传染以及激活再生等生物病毒特征。
计算机病毒有独特的复制能力，它们能够快速蔓延，又常常难以根除。
它们能把自身附着在各种类型的文件上，当文件被复制或从一个用户传送到另一个用户时，它们就随同文件一起蔓延开来。
繁殖性
计算机病毒可以像生物病毒一样进行繁殖，当正常程序运行时，它也进行运行自身复制，是否具有繁殖、感染的特征是判断某段程序为计算机病毒的首要条件。
破坏性
计算机中毒后，可能会导致正常的程序无法运行，把计算机内的文件删除或受到不同程度的损坏。
破坏引导扇区及BIOS，硬件环境破坏。
传染性
计算机病毒传染性是指计算机病毒通过修改别的程序将自身的复制品或其变体传染到其它无毒的对象上，这些对象可以是
一个程序也可以是系统中的某一个部件。
潜伏性
计算机病毒潜伏性是指计算机病毒可以依附于其它媒体寄生的能力，侵入后的病毒潜伏到条件成熟才发作，会使电脑变慢。
隐蔽性
计算机病毒具有很强的隐蔽性，可以通过病毒软件检查出来少数，隐蔽性计算机病毒时隐时现、变化无常，这类病毒处理起来非常困难。
可触发性
编制计算机病毒的人，一般都为病毒程序设定了一些触发条件，例如，系统时钟的某个时间或日期、系统运行了某些程序等。
一旦条件满足，计算机病毒就会“发作”，使系统遭到破坏。
计算机病毒的名词解释
计算机病毒的名词解释计算机病毒（Computer Virus）是指一种具有自我复制能力的恶意软件，能够感染并感染计算机系统的程序或文件。
计算机病毒一般通过潜伏在计算机系统中的感染程序，通过网络、可移动存储介质或下载文件等途径传播并感染其他计算机系统。
计算机病毒的主要目的是破坏计算机系统、窃取用户信息、传播广告等。
计算机病毒可以根据其传播方式、感染对象、危害程度等因素进行分类。
常见的计算机病毒类型包括：1. 病毒（Virus）：病毒是一种将自身复制并附着于其他文件或程序上的恶意软件。
它可以通过感染其他文件或程序的方式传播，并在被感染程序运行时执行恶意操作。
2. 蠕虫（Worm）：蠕虫是一种独立的自我复制程序，它能够通过网络自动传播，并感染其他计算机系统。
蠕虫不需要依附于其他程序或文件，因此可以迅速传播并造成严重的破坏。
3. 木马（Trojan Horse）：木马是一种伪装成正常程序的恶意软件，通常通过欺骗用户安装并运行。
一旦木马程序被运行，它可以在计算机系统中执行恶意操作或允许黑客远程控制计算机。
4. 广告软件（Adware）：广告软件是一种通过在用户界面上显示广告或弹窗来获取收益的恶意软件。
广告软件通常随着其他免费软件一起安装，用户在使用时会遭受流氓广告和不必要的推销。
计算机病毒的危害有多种形式。
首先，计算机病毒可能破坏计算机系统或文件，导致数据损坏或丢失，甚至使整个系统无法正常运行。
其次，计算机病毒可以窃取用户的敏感信息，例如密码、银行账号等，导致个人隐私泄露和财产损失。
此外，计算机病毒还可以被黑客利用来进行网络攻击，例如分布式拒绝服务攻击（DDoS），造成网络瘫痪或服务器崩溃。
为了防止计算机病毒的感染和传播，用户可以采取以下安全措施：定期更新操作系统和应用程序的补丁，安装可信的杀毒软件，并定期进行病毒扫描，避免打开来自不明来源的文件和链接，不随意下载和安装来路不明的软件，备份重要的文件和数据等。
计算机病毒
人为制造的，有破坏性，又有传染性和潜伏性的，对计 算机信息或系统起破坏作用的程序
01 简介
03 传播途径
目录
02 类型 04 特征
目录
05 中毒电脑的主要症状
07 危害
06 常见病毒举例 08 防范措施
计算机病毒（Computer Virus）指编制者在计算机程序中插入的破坏计算机功能或者破坏数据，影响计算机 正常使用并且能够自我复制的一组计算机指令或程序代码。
危害
增强对计算机病毒的防范意识，认识到病毒的破坏性和毁灭性是非常重要的。现如今，电脑已被运用到各行 各业中，计算机和计算机络已经成为人们生活中重要的组成部分，而病毒会对计算机数据的破坏和篡改，盗取会 造成严重的络安全问题，影响络的使用效益。
（1）如果激发了病毒，计算机会产生很大的反应；大部分病毒在激发的时候直接破坏计算机的重要信息数据， 它会直接破坏CMOS设置或者删除重要文件，会格式化磁盘或者改写目录区，会用“垃圾”数据来改写文件。计算 机病毒是一段计算机代码，肯定占有计算机的内存空间，有些大的病毒还在计算机内部自我复制，导致计算机内 存的大幅度减少，病毒运行时还抢占中断、修改中断在中断过程中加入病毒的“私货”，干扰了系统的正常运行。 病毒侵入系统后会自动的搜集用户重要的数据，窃取、泄漏信息和数据，造成用户信息大量泄露，给用户带来不 可估量的损失和严重的后果。
（1）络病毒：通过计算机络感染可执行文件的计算机病毒。
（2）文件病毒：主攻计算机内文件的病毒，（扩展名为.EXE或.COM的文件），当被感染的文件被执行，病 毒便开始破坏电脑，这种病毒都是伪装成游戏，成人视频软件等钓鱼的形态出现引发用户点击，病毒便明显地或 是偷偷的安装上去。
（3）引导型病毒：是一种主攻感染驱动扇区和硬盘系统引导扇区的病毒。
计算机病毒英语作文
计算机病毒英语作文Computer viruses are malicious software programs designed to replicate and spread themselves to other computers. They can cause a wide range of problems, from slowing down a computerto stealing sensitive information or damaging files.One of the most common ways that computer viruses are spreadis through email attachments. When a user opens an infected attachment, the virus can install itself on the computer and start to replicate. It can then spread to other computers on the same network or be sent out to the user's email contacts.Another way that viruses can spread is through software downloads. If a user downloads a program from an untrusted source, it may contain a virus that can infect their computer. This is why it's important to only download software from reputable sources and to keep antivirus software up to date.Once a computer is infected with a virus, it can be difficult to remove. Some viruses can hide themselves in the computer's operating system, making them difficult to detect. In some cases, it may be necessary to completely wipe the computer's hard drive and reinstall the operating system in order to remove the virus.To protect against computer viruses, it's important to take several precautions. This includes using antivirus software, being cautious about opening email attachments anddownloading software, and keeping the computer's operating system and software up to date. Regularly backing up important files can also help to minimize the damage if a virus does infect the computer.In conclusion, computer viruses are a serious threat to computer security and can cause significant damage. By taking the necessary precautions and being aware of the risks, users can protect their computers and their data from these malicious programs.。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
pictures
Where there is a virus, there is a medicion
Antivius software
Vtivirus software
Rui xing
Advantage : better fire wall Produced by police department
What is computer virus？
Computer viruses are small software programs that are designed to spread from one computer another and to interfere<介入>with computer operation.
Computer viruses might corrupt or delete data on your computer ,use your emil program to spread itself to other computer,or even erase everything on your hard disk.
Some types of computer virus
System virus
Prefixion<前缀>:win32 PE win95 and so on Feature :infect EXE and DLL files Representative: CIH
Destructive program virus
Prefixion: harm Feature: beautiful icons<图标> Harm: format diskette< 格式化磁盘> kill anti-virus software Representative: killer 13
pictures
Joke virus
Prefixion: joke Feature: more beautiful icons Harm: give user heat attack
First: use antivirus software Second: complex password Third: good habit
Forth: cut off the connection
Antivirus software develop behind virus so when we find the new computer virus, we should upload to the antivirus software center so that we can find the “medicine” quickly.
Thank you
Jin shan
Advantage :the shortest scan time
Jiang min
Advantage :does well in recognising armored< 加壳>virus repair disk
360
Advantage :fewer mistakes in killing the right software
Computer virus
.
If your computer meet such thing， your computer is likely to be killed.
what is computer virus? Some types of computer virus Some types of antivirus software Conclusion