NOTES:

• Today I captured traffic from the Rig Exploit Kit (EK) which delivered Vawtrak banking malware via the EITEST campaign.
• The traffic and payload is consistent with Vawtrak banking malware.
• EITEST is now obfuscating its injected script on compromised hosts.

I have added a zipped pcap file for your analysis. The password is the usual used by malware researchers. If you do not know it please email me.
info@broadanalysis.com

PCAP file of the infection traffic:
2016-09-14-Rig-EK-pcaps.zip

ASSOCIATED DOMAINS AND IP ADDRESSES RUN 1:

• 31.184.193.168 – standaloneinstaller.top – EITEST REDIRECT GATE
• 185.141.25.75 – e23j6j.emwj0.top – RIG EK LANDING PAGE
• 95.46.98.89 – ctwruhwdk.com – SSL Port 443 – Vawtrak POST INFECTION TRAFFIC
• 95.46.98.89 – apparatusou.bid – SSL Port 443 – Vawtrak POST INFECTION TRAFFIC
• 185.26.120.36 – GET /module/ – Vawtrak POST INFECTION TRAFFIC

DETAILS OF INFECTION CHAIN FOR RIG EK RUN 2:

Shown above: Network traffic  associated with the Rig exploit and Vawtrak infection

Shown above: DNS traffic  associated with the Rig exploit and Vawtrak infection

ASSOCIATED DOMAINS AND IP ADDRESSES RUN 2:

• 31.184.193.168 – malacollective.top – EITEST REDIRECT GATE
• 185.141.25.82 – thapzs.g9ljx1.top – RIG EK LANDING PAGE
• 95.46.98.89 – ctwruhwdk.com – SSL Port 443 – Vawtrak POST INFECTION TRAFFIC
• 108.61.99.79 – GET /module/ – Vawtrak POST INFECTION TRAFFIC

DETAILS OF INFECTION CHAIN FOR RIG EK RUN 2:

Shown above: Network traffic  associated with the Rig exploit and Vawtrak infection

Shown above: DNS traffic  associated with the Rig exploit and Vawtrak infection

Shown above: Obfuscated injected script found on index page of compromised site which redirects visitor to the EITEST gate to start infection chain – Web page source code can be found by right clicking on web page and selecting “View source”

Shown above: Obfuscated script found on compromised site submitted to http://jsunpack.jeek.org/ for de-obfuscation.

Thanks to Jack @malwareforme  for sharing de-obfuscation link!

Shown above: De-obfuscated scrupt shows redirect to the Rig exploit kit landing page

MALICIOUS PAYLOAD ASSOCIATED WITH RIG EXPLOIT:

• 2016-09-13-Negto.exe – [Vawtrak]
  C:\Users\%UserName%\AppData\Local\Qiqutf
  Virus Total Link
• 2016-09-14-Negto.exe – [Vawtrak]
  C:\Users\%UserName%\AppData\Local\Qiqutf
  Virus Total Link