Since the discovery of the WordPress TimThumb vulnerability in August 2011 by Mark Maunder, the vulnerability has been used as botnet recruitment vector, and has now spread in multiple botnets. Hundreds of WordPress blogs have been hacked, allowing potential infection of the blogs visitors, diffusion of spam and phishing campaign, DDoS, hack of other web sites (such as About.us domain name registrar), etc, etc. Some of these infected WordPress were controlled by well known C&C servers used and shared by black hats from around the world.

We are soon six month after the discovery of the vulnerability and a status on the WordPress TimThumb botnets could be done. Are the botnets still active, are less WordPress blogs vulnerable, is the pick of spread over ? We will try, through an analysis of all the WordPress TimThumb vulnerability exploitation attempts against our Honey Net, to answer these questions. The datas collected through our Honey Net are representing only a small part of the real activity of the WordPress TimThumb botnets, but these datas could also represent an extrapolation of the real activities.

List of all detected infected domains

You can find in the following table the complete list of all detected infected domains how were called during the WordPress TimThumb RFI attack, with the domain associated IP address, the country where the blog were hosted, the number of distinct source IPs how have call the related domain during the RFI attack and the live time of the domain name.

We have a total of 202 affected domains. “blogger.com.dollhousedelights.com“, hosted in Vietnam, was the affected domain how was called by the much more distinct source IPs (258), followed by “picasa.com.xpl.be” with 152 distinct source IPs, and at the third place “blogger.com.midislandrental.com” with 110 distinct source IPs.

picasa.com.xpl.be” and “picasa.computergoogle.co.cc” have the longer live time with 105 days, followed by “wordpress.com.hostdail.com” and “blogger.com.pasbar.com” with 72 days.

Infected blogs countries repartition

You can find in the following graphs (Chart1Chart2) the geographically repartition of the infected blogs.

We have a total of 31 different countries for 202 affected domains. United States is in first position with 58.9% (129) of all infected blogs, followed by Australia, Canada and United Kingdom with each 3.7% (8) of all infected blogs.

Infected blogs countries repartition by number of source IPs

You can find in the following graphs (Chart3Chart4) the geographically repartition of the infected blogs by number of distinct source IPs how have call the infected blogs.

We have a total of 1734 distinct source IPs for 202 affected domains and 31 different hosting countries. United States is in first position with 48.5% (841), followed by Vietnam with 14% (243), Indonesia with 4.7% (82) and Taiwan with 4.1% (71).

Timeline by day of infected blogs calls and source IPs

You can find in the following timeline (Chart5) a representation by day of the infected blogs number calls and source IPs.

November 2011 was the most active month for the number of source IPs and that in December the number of source IPs has drastically decrease. You can see that during the first half of November the number of infected blogs calls have increase days after days, and since the 22 November the number of infected blogs is stabilized but is not decreasing.

Geographic timeline by day of all source IPs

In this geographic time map we’re loading datas from a Google Spreadsheet (published here). These datas are coming from our HoneyNet and are representing the geographic Wordpress TimThumb Botnet activities from 15-09-2011 to 03-12-2011.

AfterGlow representation of the WordPress TimThumb

By clicking on the following link, you can download an AfterGlow representation of the WordPress TimThumb botnets with links between each nodes.

Conclusion

WordPress TimThumb botnets are still continuing to infect new blogs, but the associated activities are decreasing since second half December. Maybe black hats are still in holidays :) My personal opinion is that we will steal continu to hear about these botnets during complete 2012.