首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
计算机
The following scenario will be used for questions 29 and 30. John is a network administrator and has been told by one of his net
The following scenario will be used for questions 29 and 30. John is a network administrator and has been told by one of his net
admin
2013-12-19
116
问题
The following scenario will be used for questions 29 and 30.
John is a network administrator and has been told by one of his network staff members that two servers on the network have recently had suspicious traffic traveling to them and then from them in a sporadic manner. The traffic has been mainly ICMP, but the patterns were unusual compared to other servers over the last 30 days. John lists the directories and subdirectories on the systems and finds nothing unusual. He inspects the running processes and again finds nothing suspicious. He sees that the systems’ NICs are not in promiscuous mode, so he is assured that sniffers have not been planted.
Which of the following best explains why John does not see anything suspicious on the reported systems?
选项
A、The systems have not yet been infected.
B、He is not running the correct tools. He needs to carry out a penetration test on the two systems.
C、Trojaned files have been loaded and executed.
D、A back door has been installed and the attacker enters the system sporadically.
答案
C
解析
C正确。rootkit中的其他工具可能会不同,但通常都会包含用于掩盖攻击者行踪的实用程序。例如,每个操作系统都会包含一些供根用户或管理员用户用来检测rootki的基本实用程序、已安装的监听器和后门。黑客会使用名称相同的新的实用程序来替换这些默认的实用程序。它们就叫“特洛伊程序”,因为它们将执行预期的功能,在后台进行一些恶意行为。
A不正确。因为这不是最佳答案。因为系统很有可能没有被病毒感染,而这个问题问的是最可能的情况是什么。
B不正确。因为绝大多数rootkit都具有替换这些实用程序的特洛伊程序,因为根用户可以运行ps或top查看是否有后门服务在运行,进而检测出某个攻击。绝大多数rootkit也包含嗅探器,所以攻击者可以捕获并检查数据。要想嗅探器工作,系统的NIC必须被设置为混杂模式,这意味着NIC可以“听到”网络连接上的所有流量。默认的ipconfig实用程序允许根用户使用特定的参数查看NIC是否运行在混杂模式。所以rootkit也会包含一个ipconfig程序,它可以掩盖。NIC处于混杂模式的事实。
D不正确。因为这些服务器上很有可能不只是被安装了后门。rootkit包含允许攻击者远程控制被破坏系统的后门程序,但是rootkit中还包括许多其他工具。
转载请注明原文地址:https://kaotiyun.com/show/MAhZ777K
0
CISSP认证
相关试题推荐
AsformercolonistsofGreatBritain,theFoundingFathersoftheUnitedStatesadoptedmuchofthelegalsystemofGreatBritai
TheTreasurycouldpocket20millionayearinextrafinesoncethecountry’sspeedcameranetworkisexpanded.Motoringorgani
Thetranslatormusthaveanexcellent,up-to-dateknowledgeofhis【C1】______languages,fullfacilityinthehandlingofhistarg
Intheolddaysparentsfollowedasimplerule:sparetherodandspoilthechild.Thesedayslessviolentformsofdisciplinea
Climatechangeissupposedtounfoldslowly,overdecades.Butthatisnottrueupinthegreatwhitenorth,asthoseattending
[A]Meetingdifferentneeds[B]Smallerisbetter[C]Betterproductmakesgreaterquantity[D]Qualityvsquantity[E]Chillyc
Chinaplanstospendbillionsofdollarsinthenextfewyearstodevelopmediaandentertainmentcompaniesthatithopescanco
BendItLikeBeckhamiswelcome.ItisthestoryofaBritishgirlnamedJesswhomustchoosebetweenthetraditionsofherfami
ManypeoplethinkthatNASA’sprogramsofthelate1950sand1960swereextremelypopular,anditisoftensaidthattheApoll
Whenoneofhisemployeesphonedinsicklastyear,ScottMcDonald,CEOofMonumentSecurityinSacramento,California,decided
随机试题
A.甘油果糖B.螺内酯C.乙酰唑胺D.氢氯噻嗪E.呋塞米利尿作用最强、起效最快的药物是
《秋兴八首(其一)》中,情景交融的方式有
正常小儿于______________能抬头,______________能独坐,______________能独走。
依国际法中的庇护制度,关于受庇护的外国人的地位,下列哪项表述是正确的?()
在一容积不变的封闭容器内理想气体分子的平均速率提高为原来的2倍,则其温度和压强有何变化?()
任何单位和个人购买商业银行股份,都应事先经银监会批准。()
影响资料可靠性的可能因素有()。
文明是人类社会的基本属性,是我们党积极倡导的社会主义核心价值理念,是当代中国的核心价值追求之一。文明在引领和指示当代中国的发展进步方面具有十分重要的地位,发挥着十分重要的作用。________。这迫切需要进一步廓清文明的要义,深化对文明及文明建设的思想认识
在C++中,用来取代C中的预处理宏函数的是
A、Shefeelsembarrassedwhenspeakinginpublic.B、Herpresentationreceivesapoorgrade.C、Shehasnotcompletedherassignmen
最新回复
(
0
)