This post is co-authored by Andrew Tsonchev, Jaeson Schultz, Alex Chiu, Seth Hanford, Craig Williams, Steven Poulson, and Joel Esler. Special thanks to co-author Brandon Stultz for the exploit reverse engineering.
Silverlight exploits are the drive-by flavor of the month. Exploit Kit (EK) owners are adding Silverlight to their update releases, and since April 23rd we have observed substantial traffic (often from Malvertising) being driven to Angler instances partially using Silverlight exploits. In fact in this particular Angler campaign, the attack is more specifically targeted at Flash and Silverlight vulnerabilities and though Java is available and an included reference in the original attack landing pages, it’s never triggered.
HTTP requests for a specific Angler Exploit Kit campaign
Angler exploit content types delivered to victims, application/x-gzip (Java) is notably absent
Are you excited about March Madness? Turn on a TV and it will be hard to avoid the games, the news, the commentaries, and the jokes about it. If you eavesdrop in any restaurant, bar, or office conversation, I can assure you that you will hear something about it. Even U.S. President Barack Obama filled out a March Madness bracket. Productivity in many offices drops significantly as employees search and watch videos to see how their bracket picks are progressing. At Cisco, we have an open policy and employees can watch and search the scores of their favorite teams. Watch this video posted by CNN where Kip Compton, Cisco’s Video Collaboration Group CTO, talks about March Madness.
A few things to keep in mind:
Legitimate business sites may have vulnerabilities that allow a hostile site to deliver malware.
In most drive-by downloads, the victim is willing to dismissively click pop-ups and warnings as they navigate to the desired content. In this case, users may just click on pop-ups or ads to watch videos about their favorite team.
Most drive-by downloads can be prevented by keeping software up to date. Read More »