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攻击者利用员工一念之仁进行攻击最难防范,但要保护公司免当社交工程(socialengineering)骗术受害者还是有规则可循。

你被骗过吗?社交工程者诱骗手法往往相当细腻,受害者往往还不知所以然就上了钩。社交工程者往往利用人性弱点而非技术/软件漏洞来入侵保护周延的网络。

小偷,非强盗

这种诈骗大师的典型之一就是英国的Kevinmitnick,他曾因电脑犯罪前后进出监狱三次,出狱后mitnick决定改邪归正,现在经营起一家顾问公司defensivethinking,专门保护企业员工免受社交工程骗术之害。

mitnick在犯罪全盛时期,几乎无所不骗,他可诱使人们泄漏各种信息,包括密码、上网帐号、一般技术信息等。我们访问了mitnick,看看社交工程骗子打电话进公司找人时最常希望拿到哪些信息。

“这多半是打电话进去,然后套出他们的密码,”他说,“但其实还有更精密的攻击手法,只为了取得各种细碎的信息。”

比方说你看上某家软件公司,(这是mitnick之前最常做的事,先是在80年代窃取dEc公司的源代码,后来陆续还找过诺基亚、Sun、摩托罗拉与NEc),你不会直接打进去找It管理员,开口就说,“密码多少?”

有技巧的攻击者会安瞄准比较容易下手的部分,比如公司区域网络上的某台工作站,利用常见的技术漏洞做入侵。接着社交工程就可派上用场,用来寻找网络上哪台机器才是攻击者真正想要的目标,如此便可节省许多胡乱在LAN上摸索的时间,同时也可降低误触安全警报的风险。

如何破解攻击手法?

训练员工权衡突发的“请求”事件,尤其是通时不是在他们权限范围内应该做的事。mitnick表示社交工程高手最爱给人戴高帽,比方说“只有像你这么聪明的人才肯帮我,待会我寄给文件给你,请你打开附件看看。”他们也会使用恫吓方式,“要是你不说出密码让我进入我的mail信箱,你就等着被革职。”

若你能拒绝这种“状况外”的请求,你大概就赢一半了,“关键在于训练员工了解哪些是合法的请求,哪些不是。”mitnick说。

有些简单的政策也很容易遵循,几乎所有社交工程师不会显示来电号码,“他们会找各种借口,比如说我的手机电池快没电等等的,”mitnick如此说,公司只要立下规定说,若有人来电请求的信息是具有**/机密性质的,员工必须真的知道有这号人物,然后回电给对方确认才行,经过这一关,至少七成社交工程骗术都会事迹败露。

只要有人来电要求重设密码,It人员务必回电该名员工做确认,这样的政策绝对有助于破解社交工程骗子。

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