2016-11-28 - EITEST RIG-E FROM 146.0.72.186 SENDS CHTHONIC BANKING TROJAN
ASSOCIATED FILES:
- ZIP archive of the pcap: 2016-11-28-3rd-run-EITest-Rig-E-sends-Chthonic.pcap.zip 1.4 MB (1,404,635 bytes)
- 2016-11-28-3rd-run-EITest-Rig-E-sends-Chthonic.pcap (1,518,508 bytes)
- ZIP archive of the malware: 2016-11-28-3rd-run-EITest-Rig-E-sends-Chthonic-malware-and-artifacts.zip 241 kB (241,137 bytes)
- 2016-11-28-3rd-run-EITest-Rig-E-artifact-MXj6sFosp.txt (1,137 bytes)
- 2016-11-28-3rd-run-EITest-Rig-E-flash-exploit.swf (40,141 bytes)
- 2016-11-28-3rd-run-EITest-Rig-E-landing-page.txt (85,257 bytes)
- 2016-11-28-3rd-run-EITest-Rig-E-payload-rad2B8E4.tmp.exe (323,584 bytes)
- 2016-11-28-3rd-run-page-from-cavallinomotorsport.com-with-injected-script.txt (18,839 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 pseudoDarkleech 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 campaign stops using obfuscation for injected script in pages from compromised websites.
BACKGROUND ON THE CHTHONIC BANKING TROJAN:
- Chthonic is a variant of the Zeus Trojan originally reported in 2014 (link).
- In July 2016, Proofpoint reported Chthonic being distributed through Paypal emails (link).
- Proofpoint's ET PRO ruleset has signatures that triggered on the post-infection traffic seen below.
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
- 146.0.72.186 port 80 - yforh.a3pey0a.top - Rig-E
- 31.3.135.232 port 53 - TCP-based DNS queries from the infected host for scenabit.bit
- 217.12.218.131 port 80 - scenabit.bit - Chthonic post-infection HTTP traffic
FILE HASHES
FLASH EXPLOIT:
- SHA256 hash: b73dd34e63a001b3be1e809c889df4a075162891034404e4d344d7cfafb1bc0e
File name: 2016-11-28-3rd-run-EITest-Rig-E-flash-exploit.swf (40,141 bytes)
PAYLOAD (CHTHONIC BANKING TROJAN):
- SHA256 hash: 01fd3f6a0216c45f902cbf9d49ebe70bc7c1a13e52a0fde0ec24e4b6ce4e4ff1
File name: C:\Users\[Username]\AppData\Local\Temp\rad2B8E4.tmp.exe (323,584 bytes)
IMAGES
Shown above: Chthonic banking Trojan made persistent on the infected Windows host.
FINAL NOTES
Once again, here are the associated files:
- ZIP archive of the pcap: 2016-11-28-3rd-run-EITest-Rig-E-sends-Chthonic.pcap.zip 1.4 MB (1,404,635 bytes)
- ZIP archive of the malware: 2016-11-28-3rd-run-EITest-Rig-E-sends-Chthonic-malware-and-artifacts.zip 241 kB (241,137 bytes)
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