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重庆晚报讯(记者万里)前天,英国、意大利、俄罗斯等全球多个国家爆发勒索病毒攻击,中国大批高校也出现感染情况,众多师生的电脑文件被病毒加密,只有支付赎金才能恢复。据360安全卫士紧急公告,不法分子使用NSA泄漏的黑客武器攻击Windows漏洞,把ONION、WNCRY等勒索病毒在校园网快速传播感染,建议电脑用户尽快使用360“NSA武器库免疫工具”进行防御。
据360安全中心分析,此次校园网勒索病毒是由NSA泄漏的“永恒之蓝”黑客武器传播的。“永恒之蓝”可远程攻击Windows的445端口(文件共享),如果系统没有安装今年3月的微软补丁,无需用户任何操作,只要开机上网,“永恒之蓝”就能在电脑里执行任意代码,植入勒索病毒等恶意程序。
由于国内曾多次出现利用445端口传播的蠕虫病毒,部分运营商对个人用户封掉了445端口。但是教育网无此限制,存在大量暴露着445端口的机器,因此成为不法分子使用NSA黑客武器攻击的重灾区。正值高校毕业季,勒索病毒已造成一些应届毕业生的论文被加密篡改,直接影响到毕业答辩。目前,“永恒之蓝”传播的勒索病毒以ONION和WNCRY两个家族为主,受害机器的磁盘文件会被篡改为相应的后缀,图片、文档、视频、压缩包等各类资料都无法正常打开,只有支付赎金才能解密恢复。这两类勒索病毒,勒索金额分别是5个比特币和300美元,折合人民币分别为5万多元和2000多元。360针对校园网勒索病毒事件的监测数据显示,国内首先出现的是ONION病毒,平均每小时攻击约200次,夜间高峰期达到每小时1000多次;WNCRY勒索病毒则是5月12日下午新出现的全球性攻击,并在中国的校园网迅速扩散,夜间高峰期每小时攻击约4000次。安全专家发现,ONION勒索病毒还会与挖矿机(运算生成虚拟货币)、远控木马组团传播,形成一个集合挖矿、远控、勒索多种恶意行为的木马病毒“大礼包”,专门选择高性能服务器挖矿牟利,对普通电脑则会加密文件敲诈钱财,最大化地压榨受害机器的经济价值。针对NSA黑客武器利用的Windows系统漏洞,微软在今年3月已发布补丁修复。此前360安全中心也已推出“NSA武器库免疫工具”,能够一键检测修复NSA黑客武器攻击的漏洞;对XP、2003等已经停止更新的系统,下载NSA武器库免疫工具(http://dl.360safe.com/nsa/nsatool.exe),可以关闭漏洞利用的端口,防止电脑被NSA黑客武器植入勒索病毒等恶意程序。
(原标题:多国爆发勒索病毒 中国校园网感染)
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