Neutrino EK via pseudoDarkleech delivers CrypMic Ransomware – New CnC

NOTES:

  • Today I captured traffic from the latest version of CrypMic ransomware. The ransomware was delivered via the pseudoDarkleech campaign with use of the Neutrino 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.
  • The pseudoDarkleech campaign is making use of DNS Shadowing as explained in a sucuri.net blog post Website Malware – Evolution of Pseudo Darkleech. 
  • Yesterday I noticed an IP address change in CrypMic’s Command and Control from 95.211.225.212 to 193.111.140.100.
  • 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.

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:
2016-09-07-Neutrino-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES:

  • 74.208.109.120 – kskisivt.guitartoneguru.co.uk – Neutrino EK
  • 95.211.225.212 – Unable to Establish CONNECTION
  • 193.111.140.100 – Port 443 – Clear Text – C2 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 Neutrino exploit and CrypMic ransomware infection.

 

Shown above: Injected script found on index page of compromised site which redirects visitor to the Neutrino 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 Neutrino EK landing page.

 

Shown above: CrypMic unable to complete the TCP three-way handshake with the Command and Control host before moving on to the new CnC at IP address 193.111.140.100

 

Shown above: Ransom and payment instruction on infected host desktop associated with the CrypMic ransomware infection

 

MALICIOUS PAYLOAD ASSOCIATED WITH NEUTRINO EXPLOIT: