2016-09-02 - PSEUDO-DARKLEECH NEUTRINO EK FROM 74.208.171.129 SENDS CRYPMIC RANSOMWARE

ASSOCIATED FILES:

• ZIP archive of the pcaps:  2016-09-02-pseudoDarkleech-Neutrino-EK-sends-CrypMIC-ransomware.pcap.zip   275.1 kB (275,064 bytes)

• 2016-09-02-pseudoDarkleech-Neutrino-EK-sends-CrypMIC-ransomware.pcap   (518,305 bytes)

• ZIP archive of the malware:  2016-09-02-pseudoDarkleech-Neutrino-EK-malware-and-artifacts.zip   219.0 kB (218,991 bytes)

• 2016-09-02-page-from-mondeca.com-with-injected-script.txt   (901 bytes)
• 2016-09-02-pseudoDarkleech-Neutrino-EK-flash-exploit.swf   (80,120 bytes)
• 2016-09-02-pseudoDarkleech-Neutrino-EK-landing-page.txt   (2,456 bytes)
• 2016-09-02-pseudoDarkleech-Neutrino-EK-payload-CrypMIC.dll   (161,792 bytes)
• README.BMP   (3,276,854 bytes)
• README.HTML   (238,187 bytes)
• README.TXT   (1,654 bytes)

 

NOTES:

• Thanks again to Baber for informing me about the compromised website.

 

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

 

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 pcap filtered in Wireshark.   Wireshark filter: http.request or (!(tcp.port eq 80) and tcp.flags eq 0x0002)

 

ASSOCIATED DOMAINS:

• www.mondeca.com - Compromised site
• 74.208.171.129 port 80 - teabiscuit.b3-social.co.uk - Neutrino EK
• 95.211.225.212 port 443 - Post-infection callback traffic (custom encoded & plain text, not HTTPS/SSL/TLS)

DOMAINS FROM THE DECRYPT INSTRUCTIONS:

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

 

FILE HASHES

FLASH EXPLOIT:

• SHA256 hash:  bf43256e5b0798be849876b070f6c2fbbf866a44695aa79c579acb8a175544d1
  File name:  2016-09-02-pseudoDarkleech-Neutrino-EK-flash-exploit.swf

PAYLOAD:

• SHA256 hash:  cd3db2619c7c9160bd7b7ddeee1e55ea7f3331bae518afe32a8ad13de8378b79
  File name:  2016-09-02-pseudoDarkleech-Neutrino-EK-payload-CrypMIC.dll

 

IMAGES

Shown above:  Desktop of an infected Windows host after rebooting.

 

FINAL NOTES

Once again, here are the associated files:

• ZIP archive of the pcaps:  2016-09-02-pseudoDarkleech-Neutrino-EK-sends-CrypMIC-ransomware.pcap.zip   275.1 kB (275,064 bytes)
• ZIP archive of the malware:  2016-09-02-pseudoDarkleech-Neutrino-EK-malware-and-artifacts.zip   219.0 kB (218,991 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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