One more avatar of Nuclear Exploit Kit

February 6, 2015

Dell Sonicwall Threats Research team has recently observed an update in Nuclear Exploit Kit. The Exploit kit has added in its arsenal the latest Adobe Flash Exploit CVE-2015-0311. In addition to the new exploit, there is an update in the landing page.

Until now the landing page had obfuscated plugin detect library to determine version of Java, Adobe Flash, Adobe Reader & Silverlight plugins installed in the browser. It would then serve the corresponding exploit to compromise the user system.

But in this update we have not seen any plugin detection library and Kit targets Adobe Flash and Silverlight plugins only.

Fig-1 : old DeObfuscated Nuclear Exploit Kit landing page

Fig-2 : latest DeObfuscated Nuclear Exploit Kit landing page

On successful exploitation additional malware will be downloaded into the system. During our analysis we observed payload to be a Downloader.

Having up to date software will help in mitigating this Exploit Kit. Dell Sonicwall Threats Research team will keep on monitoring this Exploit Kit and add update mitigation signatures as required.

SonicWALL Gateway AntiVirus provides protection against this threat via the following signatures:

GAV: MalSWF ( Trojan )
GAV: MalAgent.G ( Trojan )