Rig Exploit Kit via pseudoDarkleech from 74.208.192.75 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 was not able to complete the CryptMic infection without refreshing the web browser 3 times.
  • The same flash exploit file was sent each time I refreshed the web browser however the malicious payloads were different.

Thanks to @CyberScimitar for sharing information on compromised site.

 

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:
2016-09-20-Rig-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES

  • 74.208.192.75 – puroretastillstanden.transpc.com – Rig EK LANDING PAGE
  • 65.49.8.96 – Port 443 – Clear Text – CnC Check-In POST INFECTION TRAFFIC
    [AS6939 Hurricane Electric, Inc., Fremont, CA.]

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 Wireshark’s File => Export Objects => HTTP shows Rig exploit being sent after each web browser refresh

 

Shown above: Using Wireshark’s File => Export Objects => HTTP shows malicious payload delivery after Rig’s flash  exploit

 

Shown above: Partial display of CrypMic README.html ransom note and payment instructions

 

MALICIOUS PAYLOAD ASSOCIATED WITH RIG EXPLOIT: