A recent blog post by Jacob Pimental and Max Kersten highlighted Magecart activity targeting ticket re-selling websites for the 2020 Olympics and EUFA Euro 2020, olympictickets2020.com and eurotickets2020.com respectively. These sites were compromised by a skimmer using the domain opendoorcdn.com for data exfiltration. With RiskIQ data, our researchers built on the previous reporting to identify more skimming domains used by the attackers, as well as additional compromised sites. RiskIQ can also now attribute all these cyberattacks to Magecart Group 12.
The obfuscation and skimming code we observed on opendoorcdn.com matches that used by Magecart Group 12, whose skimmer and obfuscation techniques we analyzed in our blog posts, "New Year, Same Magecart: The Continuation of Web-based Supply Chain Attacks" and "Magento Attack: All Payment Platforms are Targets for Magecart Attacks." However, there are differences in the techniques employed by Group 12 in these more recent compromises, which we'll break down here.
In those blog posts, we noted that Group 12 employed base64 encoded checks against the URL looking for the word "checkout" to identify the proper page on which to load their skimmer code. This encoding masked both the check itself and the skimmer URL. Quoting from our May 1st, 2019 report:
Next Domain Up
On February 3rd, Pimental and Kersten published their followup blog detailing their efforts to identify further opendoorcdn.com victims and have the skimming domain taken down by the Chinese company through which it was registered. On February 2nd, RiskIQ observed that opendoorcdn.com was replaced on at least two of the victim sites named in the blog by a live skimmer domain, toplevelstatic.com:
RiskIQ has observed the toplevelstatic.com domain on three victim sites so far, all of which were previously compromised by opendoorcdn.com, as seen through our host pairs data set in RiskIQ Community:
The domain toplevelstatic.com was registered on February 1st, 2020, through Chinese registrar Guangzhou Shidaihulian (now.cn) and uses the same DNS provider as opendoorcdn.com, DNSPod (also based in China). Both domains are hosted on NGINX servers and use Let's Encrypt certs. The IPs connected to toplevelstatic.com have changed at least once a day and sometimes more often, with each server, so far, based in Russia.
Hosting for opendoorcdn.com followed a more leisurely pace of flux. From January 2019 through January 2020, it sometimes used the same IP for weeks at a time and utilized servers based all over the world.
Targets Beyond Sporting Event Ticket Re-selling
RiskIQ's detection logic allowed us to identify additional domains hosting this particular magecart skimmer. Two popular emergency preparedness sites, beprepared.com and augasonfarms.com, were affected by one of these additional skimmer domains.
Both sites are owned by Blue Chip Group Manufacturing and appear to be similarly constructed. We observed augasonfarms.com loading skimming code from storefrontcdn.com on January 27th. The beprepared.com site seems to have been loading the skimming code from January 16th through 29th. In these instances, the skimmer was added through a simple script tag.
It appears the injections have been removed from sites, and they are currently free of skimming code. Additional IOCs can be viewed in our Magecart Group 12 project here: https://community.riskiq.com/projects/b959cb28-d99c-b27b-bfd8-ae15d60a7e1b
Safety in the Age of Magecart
Following the publication of this article, we noticed further detections showing that beprepared.com was also loading skimming code from wappallyzer.com, another Group 12 domain. Our data shows that this began on January 24th. We have communicated this to the affected company and are working with them to remediate.