Rig Exploit Kit via pseudoDarkleech from 5.196.126.167 delivers CrypMic Ransomware

NOTES:

  • Today I captured traffic from the latest version of CrypMic ransomware. The ransomware was delivered via the pseudoDarkleech campaign with use of the Rig Exploit Kit.
  • The injection method was an Iframe, as mentioned in a post on SANS Internet Storm Center forum Change in patterns for the pseudoDarkleech campaign.
  • CrypMic continues to send its ransom notes over SSL port 443 in clear text.
  • CrypMic is no longer using vssadmin.exe to delete the Windows shadow copy.
  • CrypMic is now sending its payload as an .EXE executable file

I have added a zipped pcap file for your analysis. The password is the usual used by malware researchers. If you do not know it please email me.
info@broadanalysis.com

PCAP file of the infection traffic:
2016-09-26-Rig-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES:

  • www.100humanhairwigs.co.uk – COMPROMISED SITE
  • 5.196.126.167 – chink12alzona.cyclemanagementassociates.info – Rig EK LANDING PAGE
  • 91.121.74.154 – Port 443 – Clear Text – CnC Check-In POST INFECTION TRAFFIC

ASSOCIATED DOMAINS FOR RANSOM PAYMENT:

http://ccjlwb22w6c22p2k.onion.to
http://ccjlwb22w6c22p2k.onion.city

 

IMAGES AND DETAILS OF INFECTION CHAIN:

Shown above: Network traffic  associated with the Rig exploit and CrypMic ransomware infection.

 

Shown above: Injected script found on index page of compromised site which redirects visitor to the Rig EK landing page to start infection chain – Web page source code can be found by right clicking on web page and selecting “View source”

 

Shown above: Using the ping command you can see the use of DNS shadowing. If you ping the landing page without the third level domain it returns to the IP address associated with the legitimate website. If you ping the third level domain you can see it returns a different IP address, which redirects to the Rig EK landing page.

 

Shown above: README.html ransom note and payment instructions associated with the CrypMic ransomware

 

MALICIOUS PAYLOAD ASSOCIATED WITH RIG EXPLOIT: