Neutrino Exploit Kit via pseudoDarkleech delivers CrypMic Ransomware
- 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.
- 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.
PCAP file of the infection traffic:
ASSOCIATED DOMAINS AND IP ADDRESSES:
- 22.214.171.124 – noordeuropese.onesecurerecord.com – Neutrino EK
- 126.96.36.199 – Port 443 – C2 Check-In – POST INFECTION TRAFFIC
ASSOCIATED DOMAINS FOR RANSOM PAYMENT:
IMAGES AND DETAILS OF INFECTION CHAIN:
In this instance because the script was injected on the first line of the index page of the compromise website, the remaining code associated with the compromised site did not load.
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.
MALICIOUS PAYLOAD ASSOCIATED WITH NEUTRINO EXPLOIT: