2016-09-28 - PSEUDO-DARKLEECH RIG EK FROM 91.134.160.174 SENDS CRYPMIC RANSOMWARE

ASSOCIATED FILES:

• ZIP archive of the pcap:  2016-09-28-pseudoDarkleech-Rig-EK-sends-CrypMIC-ransomware.pcap.zip   150.0 kB (149,982 bytes)

• 2016-09-28-pseudoDarkleech-Rig-EK-sends-CrypMIC-ransomware.pcap   (372,908 bytes)

• ZIP archive of the malware:  2016-09-28-pseudoDarkleech-Rig-EK-sends-CrypMIC-malware-and-artifacts.zip   134.9 kB (134,932 bytes)

• 2016-09-28-page-from-forwardchurch.ca-with-injected-script.txt   (32,712 bytes)
• 2016-09-28-pseudoDarkleech-Rig-EK-flash-exploit.swf   (21,640 bytes)
• 2016-09-28-pseudoDarkleech-Rig-EK-landing-page.txt   (30,034 bytes)
• 2016-09-28-pseudoDarkleech-Rig-EK-payload-CrypMIC.exe   (61,440 bytes)
• README.bmp   (3,276,854 bytes)
• README.html   (238,182 bytes)
• README.txt   (1,654 bytes)

 

NOTES:

• Thanks again to Baber for emailing me information on the compromised site.

 

BACKGROUND ON THE PSEUDO-DARKLEECH CAMPAIGN:

• Something I wrote on exploit kit (EK) fundamentals:  link
• 2016-03-22 - PaloAlto Networks Unit 42 blog:  Campaign Evolution: Darkleech to Pseudo-Darkleech and Beyond
• 2016-07-02 - SANS ISC diary:  Change in patterns for the pseudoDarkleech campaign
• 2016-09-14 - Malware-traffic-analysis.net:  The pseudoDarkleech campaign starts using Rig EK instead of Neutrino EK

 

BACKGROUND ON CRYPMIC RANSOMWARE:

• 2016-07-06 - SANS ISC diary:  CryptXXX ransomware updated   [The date I first noticed this new branch of ransomware.]

• 2016-07-14 - From the Proofpoint blog [link]: "We believe that CryptXXX is in active development and possibly split off into two branches. The original branch is now up to version 5.001 (we wrote about the upgrade to version 3.100 near the end of May), while the new branch uses a different format for versioning and will require further analysis."

• 2016-07-20 - TrendLabs Security Intelligence Blog - CrypMIC Ransomware Wants to Follow CryptXXX's Footsteps   [TrendLabs analyzes the new branch and names it.]

 

Shown above:  Flowchart for this infection traffic.

 

TRAFFIC

Shown above:  Injected script from the pseudoDarkleech campaign in page from the compromised site.

 

Shown above:  Traffic from the first pcap filtered in Wireshark.   Wireshark filter: http.request or (!(tcp.port eq 80) and tcp.flags eq 0x0002)

 

ASSOCIATED DOMAINS:

• forwardchurch.ca - Compromised site
• 91.134.160.174 port 80 - cmpndstoeltjies.thecakemag.com - Rig EK
• 162.244.35.19 port 443 - post-infection CrypMIC callback, custom encoded and clear text, not HTTPS/SSL/TLS (both infections)

DOMAINS FROM THE DECRYPT INSTRUCTIONS:

• ccjlwb22w6c22p2k.onion.to
• ccjlwb22w6c22p2k.onion.city

 

FILE HASHES

FLASH EXPLOIT:

• SHA256 hash:  dde4ec698a206614b0cce449493f72ae16be7867f0a9b76d40b192dd5ce003f5
  File name:  2016-09-28-pseudoDarkleech-Rig-EK-flash-exploit.swf

PAYLOAD:

• SHA256 hash:  07308e888dc870ae3570a7143696b0f5cf03eb20e4736c0bb231213dbe2e770d
  File name:  2016-09-28-pseudoDarkleech-Rig-EK-payload-CrypMIC.exe

 

IMAGES

Screenshot of the infected Windows host.

 

FINAL NOTES

Once again, here are the associated files:

• ZIP archive of the pcap:  2016-09-28-pseudoDarkleech-Rig-EK-sends-CrypMIC-ransomware.pcap.zip   150.0 kB (149,982 bytes)
• ZIP archive of the malware:  2016-09-28-pseudoDarkleech-Rig-EK-sends-CrypMIC-malware-and-artifacts.zip   134.9 kB (134,932 bytes)

ZIP files are password-protected with the standard password.  If you don't know it, look at the "about" page of this website.

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