2016-11-28 - EITEST RIG-V FROM 194.87.238.156 SENDS CRYPTOMIX RANSOMWARE
ASSOCIATED FILES:
- ZIP archive of the pcap: 2016-11-28-1st-run-EITest-Rig-V-sends-CryptoMix-ransomware.pcap.zip 132 kB (131,743 bytes)
- 2016-11-28-1st-run-EITest-Rig-V-sends-CryptoMix-ransomware.pcap (157,352 bytes)
- ZIP archive of the malware: 2016-11-28-1st-run-EITest-Rig-V-sends-CryptoMix-malware-and-artifacts.zip 118 kB (118,130 bytes)
- 2016-11-28-1st-run-CryptoMix-decryption-instructions.txt (3,266 bytes)
- 2016-11-28-1st-run-EITest-Rig-V-artifact-MXj6sFosp.txt (1,137 bytes)
- 2016-11-28-1st-run-EITest-Rig-V-flash-exploit.swf (12,174 bytes)
- 2016-11-28-1st-run-EITest-Rig-V-landing-page.txt (90,084 bytes)
- 2016-11-28-1st-run-EITest-Rig-V-payload-CryptoMix-rad98E03.tmp.exe (83,456 bytes)
- 2016-11-28-1st-run-page-from-cavallinomotorsport.com-with-injected-script.txt (18,628 bytes)
BACKGROUND ON RIG EXPLOIT KIT:
- I'm currently tracking 3 versions of Rig EK as classified in an October 2016 blog post by Kafeine.
- Rig-V: a "VIP version" with new URL patterns, different landing page obfuscation, and RC4 encryption for the payload. Used by the Afraidgate & pseudoDarkleech campaigns.
- Rig-E: a variant with old URL patterns, now with with RC4 encryption for the payload. Also known as Empire Pack. I often see Rig-E used by the EITest campaign.
- Rig standard: uses new URL patterns introduced by Rig-V, but old obfuscation (ASCII string to XOR the payload binary). The EITest campaign formerly used Rig standard to send CryptFile2 (CryptoMix) ransomware before switching to Rig-V for that purpose.
BACKGROUND ON THE EITEST CAMPAIGN:
- Something I wrote on exploit kit (EK) fundamentals: link
- 2016-10-03 - Palo Alto Networks Unit 42 blog: EITest Campaign Evolution: From Angler EK to Neutrino and Rig.
- 2016-10-03 - Broadanalysis.com: EITest campaign stopped using a gate.
- 2016-10-15 - Broadanalysis.com: EITest campaing stops using obfuscation for injected script in pages from compromised websites.
CRYPTFILE2 IS CRYPTOMIX:
- The ransomware I've been calling CryptFile2 actually calls itself CryptoMix. (I tweeted about this earlier today - link). See the images section below for details.
- Results from a quick Google search show some entries by others about CryptoMix.
- Today's the first day I've noticed the EITest campaign use Rig-V instead of Rig standard to send CryptoMix (CryptFile2) ransomware.
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:
- cavallinomotorsport.com - Compromised site
- 194.87.238.156 port 80 - rew.ufound.org - Rig-V
- 195.154.105.247 port 80 - 195.154.105.247 - CryptoMix post-infection traffic
FILE HASHES
FLASH EXPLOIT:
- SHA256 hash: a51c4a6e8797b75620efb64edf297bd2137230a45c18d96f66a3e9edbe988403
File name: 2016-11-28-1st-run-EITest-Rig-V-flash-exploit.swf (12,174 bytes)
PAYLOAD (CRYPTOMIX RANSOMWARE):
- SHA256 hash: 1e278de6b60a036e05197baa5583360c3acdde3aeeb36106baabe827871f0270
File name: C:\Users\[Username]\AppData\Local\Temp\rad98E03.tmp.exe (83,456 bytes)
IMAGES
Shown above: Traffic alerts show this is CryptFile2.
Shown above: But the ransom note states it's CryptoMix.
FINAL NOTES
Once again, here are the associated files:
- ZIP archive of the pcap: 2016-11-28-1st-run-EITest-Rig-V-sends-CryptoMix-ransomware.pcap.zip 132 kB (131,743 bytes)
- ZIP archive of the malware: 2016-11-28-1st-run-EITest-Rig-V-sends-CryptoMix-malware-and-artifacts.zip 118 kB (118,130 bytes)
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