Special Podcast in German: Interview über das Internet Storm Center. https://isc.sans.edu/videoaudio.html#special
ISC StormCast for Friday, August 29th 2014 http://isc.sans.edu/podcastdetail.html?id=4127

False Positive or Not? Difficult to Analyze Javascript

Published: 2014-08-29
Last Updated: 2014-08-29 00:36:20 UTC
by Johannes Ullrich (Version: 1)
3 comment(s)

Our reader Travis sent us the following message:

We have had 2 users this morning hit a Forbes page: hxxp://www.forbes.com/sites/jimblasingame/2013/05/07/success-or-achievement/

And then after being referred from there to: hxxp://ml314.com/tag.aspx?2772014

They are setting off our FireEye web appliance. It is advising that this is an "Infection Match" which I am not entirely familiar with their systems determinations as it is fairly new to us. I called down the source of the link they went to and can submit that as well if you would like it, but I haven't had a chance to look at it yet just beautified it and saved it.

I went ahead and downloaded the "ml314.com" URL using wget, and what comes back is heavily obfuscated Javascript. I am just quoting some excerpts of it below:

(function(a){var g=window.document;var h=[];var e=[];var f=(g.readyState=="complete"||g.readyState=="loaded"||g.readyState=="interactive");var d=null;var j=function(k){try{k.apply(this,e)}catch(l){if(d!==null){d.call(this,l)}}};var c=functi...36);F=p(F,D,B,G,E[1],12,-389564586);G=p(G,F,D,B,E[2],17,606105819);B=p(B,G,F,D,E[3],22,-1044525330);D=p(D,B,G,F,E[4],7,-176418897);F=p(F,D,B,G,E[5],12,1200080426);G=p(G,F,D,B,E[6],17,-1473231341);B=p(B,G,F,D,E[7],22,-45705983);D=p(D,B,G,F,E[8],7,1770035416);F=p(F,D,B,G,E[9],12,-1958414417);G=p(G,F,D,B,E[10],17,-42063);B=p(B,G,F,D,E[11],22,-1990404162);D=p(D,B,G,F,E[12],7,1804603682);F=p(F,D,B,G,E[13],12,-40341101);G=p(G,F,D, ... function f(o){o.preventDefault();o.stopPropagation()}function i(o){if(g){return g}if(o.matches){g=o.matches}if(o.webkitMatchesSelector){g=o.webkitMatchesSelector}if(o.mozMatchesSelector){g=o.mozMatchesSelector}if(o.msMatchesSelector){g=o.msMatchesSelector}if(o.oMat ... try{s=new ActiveXObject("ShockwaveFlash.ShockwaveFlash");p=s.GetVariable("$version").substring(4);p=p.split(",");p=p[0]+"."+p[1]}catch(r){}if(s){q="Flash"}return{name:q,version:

In short: Very obfuscated (not just "minimized"), and a lot of keywords that point to detecting plugin versions. Something that you would certainly find in your average exploit kit. But overall, it didn't quite "add up". Not having a ton of time, I ran it through a couple Javascript de-obfuscators without much luck. The domain "ml314.com" also looked a bit "odd", but lets see when it was registered:

$ whois ml314.comâ??

   Domain Name: ML314.COM
   Name Server: NS.RACKSPACE.COM
   Name Server: NS2.RACKSPACE.COM
   Updated Date: 22-apr-2013
   Creation Date: 22-apr-2013
   Expiration Date: 22-apr-2018

â??Admin Organization: Madison Logic
Admin Street: 257 Park Ave South
Admin Street: 5th Floor

The domain name isn't new, and hosted in what I would call a "decent" neighborhood on the Internet. The owner information doesn't look outright fake, and indeed gives us a bit more information to solve the puzzle. Turns out that "Madison Logic" is in the web advertisement / click through business, so what you are seeing is likely their proprietary Javascript to track users better. 

In the end, I call this a "false positive", but then again, feel free to correct me. This is just one example how sometimes things are not simple "black/white" when it comes to odd Javascript.

---
Johannes B. Ullrich, Ph.D.
STI|Twitter|LinkedIn

3 comment(s)

Comments

cwqwqwq
eweew<a href="https://www.seocheckin.com/edu-sites-list/">mashood</a>
WQwqwqwq[url=https://www.seocheckin.com/edu-sites-list/]mashood[/url]
dwqqqwqwq mashood
[https://isc.sans.edu/diary.html](https://isc.sans.edu/diary.html)
[https://isc.sans.edu/diary.html | https://isc.sans.edu/diary.html]
What's this all about ..?
password reveal .
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure:

<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.

<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
https://thehomestore.com.pk/

Diary Archives