Since Monday the 21st of March the Fox-IT Security Operations Center (SOC) has been observing malicious redirects towards the Angler exploit kit coming from the security certification provider known as the EC-COUNCIL. As of writing this blog article on the Thursday the 24th of March the redirect is still present on the EC-COUNCIL iClass website for CEH certification located at iclass[dot]eccouncil[dot]org. We have reached out and notified the EC-COUNCIL but no corrective action has been taken yet.
Exploit kit details: Angler exploit kit
We first observed the redirect on Monday around 3pm GMT but we suspect it might have been there for a longer period of time. The redirect occurs only when specific conditions are met, these conditions are:
- The visitor has to have Microsoft Internet Explorer as a browser (or at least the user-agent has to represent Internet Explorer)
- The visitor comes from a search engine like Google or Bing
- The visitor’s IP address is not blacklisted or belonging to a blocked geolocation. The inject avoids certain countries (possibly tied to a bad ‘ROI’ for the criminals running the ransomware that is being dropped)
Once a visitor meets all these requirements a redirect is embedded at the bottom of the page as seen in this screenshot:
Through this embedding the client is redirected a couple of times to avoid/frustrate/stop manual analysis and some automated systems. Once the user has jumped through all the redirects he/she ends up on the Angler exploit kit landing page from which the browser, flashplayer plugin or silverlight plugin will be exploited. The Angler exploit kit first starts the ‘Bedep’ loader on an exploited victim machine which will download the final payload.
The way the redirect occurs on the EC-COUNCIL website is through PHP code on the webserver which is injecting the redirect into the webpage. A vulnerability in the EC-COUNCIL website is most likely exploited as it runs the very popular WordPress CMS which has been a target through vulnerable plug-ins for years.
Payload details: TeslaCrypt
This specific campaign instance of the Angler exploit kit drops ‘TeslaCrypt’ on the exploited victim’s machine. TeslaCrypt is a piece of ransomware which takes a victim’s files hostage with the use of encryption. Once the victim’s files have been successfully encrypted a ransom note is presented to instruct the victim on ways to recover files:
TeslaCrypt requires the victim to pay around 1.5 BTC to get their files back; this equals to approximately 622$ at the current conversion rate.
Indicators of Compromise (IOCs)
Bedep C&C servers:
188.8.131.52 / kjnoa9sdi3mrlsdnfi[.]com
184.108.40.206 / moregoodstafsforus[.]com
220.127.116.11 / jimmymorisonguitars[.]com
18.104.22.168 / bookersmartest[.]xyz
TeslaCrypt C&C servers:
22.214.171.124 / mkis[.]org
126.96.36.199 / tradinbow[.]com