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Fiesta Exploit Pack is No Party for Drive-By Victims

This post was also authored by Andrew Tsonchev and Steven Poulson.

TRAC-tank-vertical_logo

Update 2014-05-26Thank you to Fox-IT for providing the Fiesta logo image. We updated the caption to accurately reflect image attribution.

Cisco’s Cloud Web Security (CWS) service provides TRAC researchers with a constant fire hose of malicious insight and now that we are collaborating with Sourcefire's Vulnerability Research Team (VRT) we have additional capabilities to quickly isolate and prioritize specific web exploit activity for further analysis. Thus when we were recently alerted to an aggressive Fiesta exploit pack (EP) campaign targeting our customers, we quickly compared notes and found that in addition to the typical Java exploits, this EP was also using a Microsoft Silverlight exploit. In the Cisco 2014 Annual Security Report (ASR) we discuss how 2013 was a banner year for Java exploits, and while updating Java should remain a top priority, Silverlight is certainly worth patching as threat actors continue to search for new application exploits to leverage in drive-by attacks.

Fiesta Exploit Pack

Image provided courtesy of Fox-IT

Over the past 30 days this specific Fiesta campaign was blocked across more than 300 different companies. The attacker(s) used numerous dynamic DNS (DDNS) domains - that resolved to six different IP addresses - as exploit landing pages. The chart below depicts the distribution of hosts used in this attack across the most blocked DDNS base domains.

CWS Fiesta Blocks by Distinct Requests

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