Hello,
Java Zero-Day Exploit (CVE-2013-0422) is being detected by Symantec Intrusion Prevention.
Symantec has the following IPS signatures in place that specifically protect against the Cool Exploit Kit:
Web Attack: Cool Exploit Kit Website - www.symantec.com/security_response/attacksignatures/detail.jsp
Web Attack: Cool Exploit Kit PDF Download - www.symantec.com/security_response/attacksignatures/detail.jsp
You may also like to check this Latest Symantec Article on the same issue -
Java Zero-Day Exploit (CVE-2013-0422)
http://www.symantec.com/docs/TECH201601
and these Latest Symantec BLOG's
Java Zero-Day Dished Up from Cool Exploit Kit
http://www.symantec.com/connect/blogs/java-zero-day-dished-cool-exploit-kit
Additional Protection for Recent Java Zero-Day
http://www.symantec.com/connect/blogs/additional-protection-recent-java-zero-day
On January 13, 2012, Oracle has released the patch found on -
http://www.oracle.com/technetwork/java/javase/downloads/index.html
and
Symantec strongly urges all users of Java to download and install this patch as soon as possible.
Oracle has also provided a blog for further details on the vulnerability.
https://blogs.oracle.com/security/entry/security_alert_for_cve_2013
I am sure the above information would assist you to Answer your question.