Rig Exploit Kit via the EiTest delivers CryptFile2 ransomware

NOTES:

  • Today I captured traffic from the Rig Exploit Kit (EK) which delivered CryptFile2  ransomware via the EITEST campaign.
  • Files on the infected host were encrypted and the file extensions were changed to @dr.com_.rmd .
  • 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:
2016-12-02-Rig-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES:

  • mountainsmith.com – COMPROMISED SITE
  • 194.87.238.148 – add.nocoauto.net – RIG EK LANDING PAGE
  • 217.23.12.109 – GET /microsoftosinfo.html – CryptFile2 POST INFECT TRAFFIC
  • 217.23.12.109 – POST /microsoft/get_os_info.php – CryptFile2 POST INFECT TRAFFIC

ASSOCIATED EMAILS FOR RANSOM PAYMENT:

E-MAIL1: enc10@dr.com
E-MAIL2: enc10@usa.com

 

IMAGES AND DETAILS OF INFECTION CHAIN:

Shown above: Network traffic  associated with the Rig exploit and the delivery of CryptFile2 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: # HELP_DECRYPT_YOUR_FILES.TXT ransom note and payment instruction associated with CryptFile2 ransomware

 

MALICIOUS PAYLOAD ASSOCIATED WITH RIG EXPLOIT: