If you read the recently released Cisco Annual Security Report, you will have learned how spammers have adopted a “Snowshoe” strategy, using a large number of IP addresses with a low message volume per IP address, to send spam, preventing some spam systems from sinking the spam. This yielded a 250 percent increase in spam from January 2014 to November 2014. Or, perhaps the fact that malicious actors are using malvertising (malicious advertising) from web browser add-ons as a medium for distributing malware and unwanted applications caught your eye in the report. In order to protect against these types of emerging threats, Cisco showcases its continued thought leadership in email security to offer even greater protection and control across the attack continuum, while also providing additional flexibility for centralized management. Read More »
Cisco Email Security Stays Ahead of Current Threats by Adding Stronger Snowshoe Spam Defense, AMP Enhancements, and More…
This post was authored by Armin Pelkmann.
On September 8th, Cisco’s Talos Security Intelligence & Research Group unveiled the existence of the “Kyle and Stan” Malvertisement Network. The network was responsible for placing malicious advertisements on big websites like amazon.com, ads.yahoo.com, www.winrar.com, youtube.com and 70 other domains. As it turns out, this was just the tip of the iceberg. Ongoing research now reveals the real size of the attackers’ network is 9 times larger than reported in our first blog. For more details, read the Kyle and Stan Blog.
The infographic below illustrates how much more of the malvertisement network was uncovered in comparison to our first assessment. We have now isolated 6491 domains sharing the same infrastructure. This is over 9 times the previously mentioned 703 domains. We have observed and analyzed 31151 connections made to these domains. This equals over 3 times the amount of connections previously observed. The increase in connections is most likely not proportional to the domains due to the fact that a long time that has passed since the initial attacks.
Threat Spotlight: “Kyle and Stan” Malvertising Network Threatens Windows and Mac Users With Mutating Malware
This post was authored by Shaun Hurley, David McDaniel and Armin Pelkmann.
Update 2014-09-22: Updates on this threat can be found here
Have you visited amazon.com, ads.yahoo.com, www.winrar.com, youtube.com, or any of the 74 domains listed below lately? If the answer is yes, then you may have been a victim to the “Kyle and Stan” Malvertising Network that distributes sophisticated, mutating malware for Windows and even Macs.
Table of contents
Malvertising is a short form for “malicious advertising.” The idea is very simple: use online advertising to spread malware. Read More »
Every so often, we observe certain spam campaigns that catch our interest. On August 15, we observed a particular spam campaign that caught our attention because it was using “snowshoe” spam techniques combined with PDF exploitation. While neither of these techniques are new, we have seen a growing trend involving snowshoe spam and we wanted to explain why the bad guys seem to be moving in that direction with a real world example. As you can see from the chart below, we’ve seen the amount of snowshoe spam double since November of 2013.
Snowshoe spam can be a challenge for some anti-spam detection techniques because it typically uses multiple IP addresses with very low spam volume per IP address. Depending on how an anti-spam technology works, this can cause severe problems with detection. Typically technologies that use multiple defensive layers of protection, like Cisco’s ESA, are much more successful at combating snowshoe spam. We’ve previously discussed these tactics in a previous blog post.
My personal email has 4 characteristics that drive me crazy:
- I get way too much email
- Most of my emails are a waste of time
- Emails carry the risk of, very rarely, nasty virus payloads (or link you to sites that have worse)
- Despite all this, I can’t live without email Read More »