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勒索病毒席卷全球 如何预防电脑被勒索“绑架”?

2017-05-14 09:32:50   中国网

部分高校通知称,近期国内多所院校出现ONION勒索软件感染情况,磁盘文件会被病毒加密为.onion后缀,只有支付高额赎金才能解密恢复文件,对学习资料和个人数据造成严重损失。根据网络安全机构通报,这是不法分子利用NSA黑客武器库泄漏的“永恒之蓝”发起的病毒攻击事件。

国内外被攻击的电脑中的是同一病毒

腾讯反病毒实验室表示,在NSA泄漏的文件中,WannaCry传播方式的漏洞利用代码被称为“EternalBlue”,所以也有的媒体报道称此次攻击为“永恒之蓝”。

据腾讯反病毒实验室分析,这次WanaCry2.0系列攻击,实际上是一次蠕虫攻击,威力等同于当年的conficker。该蠕虫一旦攻击进入能连接公网的用户机器,就会利用内置了EnternalBlue的攻击代码,自动在内网里寻找开启了445端口的机器进行渗透。

中国国家互联网应急中心称,当用户主机系统被该勒索软件入侵后,用户主机上的重要数据文件,如:照片、图片、文档、压缩包、音频、视频、可执行程序等多种类型的文件,都被恶意加密且后缀名统一修改为“.WNCRY”。

国内高校为何此次成病毒攻击“重灾区”?

腾讯反病毒实验室认为,各大高校通常接入的网络是为教育、科研和国际学术交流服务的教育科研网,此骨干网出于学术目的,大多没有对445端口做防范处理,这是导致这次高校成为重灾区的原因之一。

此外,如果用户电脑开启防火墙,也会阻止电脑接收445端口的数据。但中国高校内,一些同学为了打局域网游戏,有时需要关闭防火墙,也是此次事件在中国高校内大肆传播的另一原因。


腾讯安全反病毒实验室公布的WanaCrypt0r 2.0攻击流程图。

腾讯反病毒实验室还表示,相关网络运营商在骨干网ISP策略中习惯性禁止445端口的数据传输,防止蠕虫等病毒传播的策略,发挥了重要的作用。在本次漏洞事件中,间接地降低了本次漏洞所带来的风险。

你的电脑若中毒了怎么办?

根据中国国家信息安全漏洞共享平台(CNVD)秘书处普查的结果,互联网上共有900余万台主机IP暴露445端口(端口开放),而中国大陆地区主机IP有300余万台。

据外媒报道,一名网络安全研究员声称他找到方法能停止这个病毒扩散,但警告这只是暂时性质的。

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