Neutrino Exploit Kit via pseudoDarkleech 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 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. 
  • UPDATE: URL’s to ransom payment sites have changed.
  • UPDATE: My infected computer was unable to communicate with the command and control (C2) server, however CrypMic was able to complete the infection.

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:
2016-08-08-Neutrino-EK-pcap.zip

 

ASSOCIATED DOMAINS AND IP ADDRESSES:

  • 96.127.174.218 – cystogenuscorrellations.metaldehyde-stewardship.co.uk – Neutrino EK
  • 193.111.140.100  PORT 443 – Clear Text – C2 HOST UNAVAILABLE 

ASSOCIATED DOMAINS FOR RANSOM PAYMENT:

http://xijymvzq4zkyubfe.onion.to
http://xijymvzq4zkyubfe.onion.city

 

IMAGES AND DETAILS OF INFECTION CHAIN:

Shown above: Traffic  associated with the Neutrino exploit and CrypMIC ransomware infection. It appears the CrypMic  command and control (C2) server is down. CrypMic was unable to complete the TCP 3 way handshake as explained [HERE]

 

Shown above: Injected iframe script found on index page of compromised site. The Index page was extracted from the pcap file using Wireshark filter File => Export Objects => HTTP.

 

Shown above: Partial content of packet 139 from Neutrino landing page shows Neutrino exploiting an outdated version of flash

 

Shown above: Partial content of packet 223 shows malicious payload being delivered in encrypted or obfuscated code

 

Shown above: CrypMic .HTML ransom note and De-Crypt instructions README.HTML [Raw un-formatted html]

 

Shown above: CrypMic README.txt ransom note showing new ransom payment URL’s

 

MALICIOUS PAYLOAD ASSOCIATED WITH NEUTRINO EXPLOIT: