文件的外壳型病毒( )。
- A.寄生于磁盘介质的引导区,借助系统引导过程进入系统
- B.寄生在主程序的首尾,当文件执行时,病毒程序将被执行
- C.寄生在编译处理程序或链接程序中
- D.是用自身代替正常程序中的部分模块或堆栈区
正确答案及解析
正确答案
解析
本题考查文件的病毒类型。
源码型病毒:在程序被编译之前,插入目标源程序中,成为合法程序的一部分。
入侵型病毒:通过寻找宿主主程序的空隙将自己嵌入进去,使病毒程序与目标程序成为一体,变成合法程序的一部分。
外壳性病毒:通常链接在宿主程序的首尾,对原来的主程序不作修改或仅作简单修改。当宿主程序执行时,首先执行并激活病毒程序,使病毒感染、繁衍和发作。
操作系统型病毒:用自己的逻辑部分取代操作系统中的合法程序模块,从而寄生在计算机磁盘操作系统区。
综合分析,B选项符合。(A选项属于入侵型,C选项属于源码型,D选项属于操作系统型)
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