Rig Exploit Kit via the EiTest delivers CryptoShield ransomware

NOTES:

  • Today I captured traffic from the Rig Exploit Kit (EK) which delivered CryptoShield  ransomware via the EITEST campaign.
  • Files on the infected host were encrypted and the file extensions were changed to .WCT.CRYPTOSHIELD .
  • The Rig exploit kit is making use of DNS Shadowing as explained in a sucuri.net blog post Website Malware – Evolution of Pseudo Darkleech. 

I have added a zipped pcap file for your analysis. The password for the zipped pcap is infected all lowercase.

PCAP file of the infection traffic:
2017-01-31-Rig-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES:

  • cedar.igrooveweb.com – COMPROMISED SITE
  • 195.133.144.228 – marfa.cholesterolwatchers.net – RIG EK LANDING PAGE
  • 45.76.81.110 – POST /test_site_scripts/moduls/traffic/get_info.php – CRYPTOSHIELD C2

ASSOCIATED EMAILS FOR RANSOM PAYMENT:

restoring_sup@india.com – SUPPORT;
restoring_sup@computer4u.com – SUPPORT RESERVE FIRST;
restoring_reserve@india.com – SUPPORT RESERVE SECOND;

 

IMAGES AND DETAILS OF INFECTION CHAIN:

Shown above: Network traffic  associated with the Rig exploit and the delivery of CryptoShield ransomware

 

Shown above: Injected script found on index page of compromised site associated with the EiTest campaign which redirects visitors to the Rig EK landing page – Web page source code can be found by right clicking on web page and selecting “View source”

 

Shown above: After extracting Rig flash exploit and saving as .swf file, decompiled using Flare (http://www.nowrap.de/flare.html) and examined flash meta data with text editor.

 

Shown above: # RESTORING FILES #.HTML ransom note and payment instruction associated with CryptoShield ransomware

 

MALICIOUS PAYLOAD ASSOCIATED WITH RIG EXPLOIT: