If you are working in computer security and still don’t have heard about the latest Adobe Flash 0days, aka CVE-2013-0633 and CVE-2013-0634, then you should change of job ! These vulnerabilities were found exploited in targeted attacks through spear phishing email messages targeting several industries including the aerospace one.

One of the e-email attached Word document was using the 2013 IEEE Aerospace Conference schedule, and another reported sample was related to online payroll system of ADP US company, to exploit CVE-2013-0633. I wrote a complete blog post regarding this campaign 2 weeks ago.

Adobe fixed the vulnerabilities in APSB13-04 the 7 February, but the vulnerabilities were not found massively exploited in Exploit Kits. Also there was a confusion,  by anti-virus vendors and security researchers, regarding CVE-2013-0633 and CVE-2013-0634 detection. But as mentioned in Adobe APSB13-04 CVE-2013-0633 was only exploited by been embedded in Word documents and CVE-2013-0634 was exploited through HTML web pages and by been embedded in Word documents.

So as nobody as seen CVE-2013-0633 working outside a Word document, I will suppose that the vulnerability I discovered exploited in Gong Da exploit kit is potentially a fork of CVE-2013-0633 or could be CVE-2013-0634. Colleagues, you are welcome for comments 🙂

Here is the new code in Gong Da exploit kit.

Capture d’écran 2013-02-25 à 23.29.30

If you take a look at the ActionScript of “myrF03.swf” (506fe8f82ea151959c5160bc40da25b5) you will see some similarities with CVE-2013-0633, like the “ByteArrayAsset” mentioned by MalwareMustDie, or the well-known “LadyBoyle” function.

Capture d’écran 2013-02-26 à 00.10.49

Capture d’écran 2013-02-26 à 00.11.03

This new version was discovered on “hxxp://www.jhtyhtrsgr.com/yymex/index.html” a web site how is actually still online.

Capture d’écran 2013-02-25 à 23.29.04

jhtyhtrsgr.com” is hosted on 69.197.61.29, in US and this domain name was created the 22 Feb 2013 with registration informations located in China and the following contact “jing yan (ttfu7ii777@126.com) – GuangMing yanjing“.

The “index.html” file containing JavaScript code obfuscated by “JSXX VIP JS Obfuscator“, but traditional traces if this obfuscator are no more available.

After de-obfuscation of the “index.html” file you can see that Gong Da Pack has involve to the following diagram.

Gong Da EK 1.4 - 2

Here under some information s regarding the different files:

  • vQSopE2.jpg (aka CVE-2011-3544) : 10/46 on VirusTotal.com
  • ulxzBc7.jpg (aka CVE-2012-0507) : 11/45 on VirusTotal.com
  • MQnA3.jpg (aka CVE-2012-1723) : 18/46 on VirusTotal.com
  • eATBNfg1.jpg (aka CVE-2012-4681) : 29/46 on VirusTotal.com
  • tkPfaMz7.jpg (aka CVE-2012-5076) : 14/46 on VirusTotal.com
  • iOiezo6.jpg (aka CVE-2013-0422): 19/46 on VirusTotal.com
  • YPVTz8.html (aka CVE-2012-1889): 14/46 on VirusTotal.com
  • vQSopE2.html (aka CVE-2012-1889): 12/46 on VirusTotal.com
  • myrFO3.swf (aka a fork of CVE-2013-0633 CVE-2013-0634): 8/46 on VirusTotal.com

Here under a demonstration video of CVE-2013-0633 CVE-2013-0634 without been embeded in a Word document.

Updates:

After investigation from @unixfreaxjp, it seem that the exploited vulnerability is CVE-2013-0634 and not CVE-2013-0633.