2017-01-12 - EITEST RIG-V FROM 81.177.139.122 SENDS CRYPTOMIX RANSOMWARE

ASSOCIATED FILES:

• ZIP archive of the pcaps:  2017-01-12-EITest-Rig-V-sends-CryptoMix-ransomware.pcap.zip   190 kB (189,911 bytes)

• 2017-01-12-EITest-Rig-V-sends-CryptoMix-ransomware.pcap   (256,887 bytes)

• ZIP archive of the malware:  2017-01-12-EITest-Rig-V-sends-CryptoMix-malware-and-artifacts.zip   100 kB (100,477 bytes)

• 2017-01-12-CryptoMix-decryption-instructions.txt   (1,494 bytes)
• 2017-01-12-EITest-Rig-V-CryptoMix-rad62A62.tmp.exe   (99,328 bytes)
• 2017-01-12-EITest-Rig-V-artifact-QTTYUADAF.txt   (1,137 bytes)
• 2017-01-12-EITest-Rig-V-flash-exploit.swf   (18,079 bytes)
• 2017-01-12-EITest-Rig-V-landing-page.txt   (5,180 bytes)
• 2017-01-12-page-from-activaclinics.com-with-injected-EITest-script.txt   (59,325 bytes)

BACKGROUND ON RIG EXPLOIT KIT:

• I usually run across 2 versions of Rig EK:  Rig-V (Rig 4.0) and Rig-E (Empire Pack).
• Rig-V is what security researchers called Rig EK version 4 when it was only accessible by "VIP" customers, while the old version (Rig 3) was still in use (reference).
• I currently call it "Rig-V" out of habit.
• The proper name for Rig-E is "Empire Pack".  Empire Pack a variant of Rig EK as described by Kafeine here.
• I haven't seen Empire Pack traffic in 2017 yet, but I often see it from the EITest campaign (when EITest is distributing something other than CryptoMix/CryptFile2 or Cerber).

BACKGROUND ON THE EITEST CAMPAIGN:

• My most recent write-up on the EITest campaign can be found here.

BACKGROUND ON CRYPTOMIX RANSOMWARE:

• The ransomware I used to call CryptFile2 is actually CryptoMix.  Details can be found here.
• The EITest campaign currently uses Rig-V to send this CryptoMix (CryptFile2) ransomware.
• Some people might be tempted to call this "Lesli ransomware" based on LESLI SPYING ON YOU in the ransom note and the .lesli file extension it uses for encrypted files.
• Don't be fooled.  This is actually CryptoMix/CryptFile2 ransomware.
• I first saw the .lesli file extension used by CryptoMix last year on 2016-11-28.

Shown above:  Flowchart for this infection traffic.

 

TRAFFIC

Shown above:  Injected script from the EITest campaign from the compromised site.

 

Shown above:  Pcap of the infection traffic filtered in Wireshark.

 

ASSOCIATED DOMAINS:

• activaclinics.com - Compromised site
• 81.177.139.122 port 80 - we.sedona.news - Rig-V
• 91.121.244.84 port 80 - 91.121.244.84 - CryptoMix post-infection traffic

• supl@post.com - first email from CryptoMix decryption instructions
• supl@oath.com - second email from CryptoMix decryption instructions

 

FILE HASHES

FLASH EXPLOIT:

• SHA256 hash:  b8e1518bf86a521c0d556c66eb2950070680fb40e13e6c061f5bbe274325631c   (18,079 bytes)
  File description:  Rig-V Flash exploit seen on 2017-01-12

PAYLOAD (CRYPTOMIX/CRYPTFILE2):

• SHA256 hash:  40c06d88bb2fca93e44d5ce76e3900c957813ec996a533eebce627e2cfcbca1d   (99,328 bytes)
  File path example:  C:\Users\[username]\AppData\Local\Temp\rad62A62.tmp.exe

 

IMAGES

Shown above:  Desktop of the infected Windows host.

 

FINAL NOTES

Once again, here are the associated files:

• ZIP archive of the pcaps:  2017-01-12-EITest-Rig-V-sends-CryptoMix-ransomware.pcap.zip   190 kB (189,911 bytes)
• ZIP archive of the malware:  2017-01-12-EITest-Rig-V-sends-CryptoMix-malware-and-artifacts.zip   100 kB (100,477 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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