2017-01-13 - EITEST RIG-V FROM 92.53.120[.]233 SENDS CRYPTOMIX RANSOMWARE

NOTICE:

• The zip archives on this page have been updated, and they now use the new password scheme.  For the new password, see the "about" page of this website.

ASSOCIATED FILES:

• 2017-01-13-EITest-Rig-V-sends-CryptoMix-ransomware.pcap.zip   203 kB (202,655 bytes)

• 2017-01-13-EITest-Rig-V-sends-CryptoMix-ransomware.pcap   (239,575 bytes)

• 2017-01-13-EITest-Rig-V-artifacts-and-CryptoMix-ransomware.zip   99.6 kB (99,594 bytes)

• 2017-01-13-CryptoMix-ransomware-decryption-instructions.txt   (1,480 bytes)
• 2017-01-13-EITest-Rig-V-flash-exploit.swf   (18,074 bytes)
• 2017-01-13-EITest-Rig-V-landing-page.txt   (5,183 bytes)
• 2017-01-13-EITest-Rig-V-payload-CryptoMix-ransomware-radBE8B9.tmp.exe   (97,792 bytes)
• 2017-01-13-page-from-activaclinics_com-with-injected-EITest-script.txt   (58,231 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.
• 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 ransomware.  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 ransomware 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
• 92.53.120[.]233 port 80 - acc.tps15[.]com - Rig-V
• 91.121.244[.]84 port 80 - 91.121.244[.]84 - CryptoMix ransomware post-infection traffic

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

 

FILE HASHES

FLASH EXPLOIT:

• SHA256 hash:  76cd48af0b8a0dbaa9260996cd4347a811bc0a09efce18c9d25f7cc59828d335   (18,074 bytes)
  File description:  Rig-V Flash exploit seen on 2017-01-13

PAYLOAD (CRYPTOMIX/CRYPTFILE2 RANSOMWARE):

• SHA256 hash:  a7b08131a99195284ae916033f5ae3cc6b7df70cd83540d8eaf34064b65c981a   (97,792 bytes)
  File path example:  C:\Users\[username]\AppData\Local\Temp\radBE8B9.tmp.exe

 

IMAGES

Shown above:  Desktop of the infected Windows host.

 

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