eFax spam leads to Cryptowall

Yet another fake eFax spam. I mean really I cannot remember the last time someone sent me a fax. What's next? "Someone has sent you a telegram"?

From:     eFax [message@inbound.efax.com]
Date:     11 September 2014 20:35
Subject:     eFax message from "unknown" - 1 page(s), Caller-ID: 1-865-537-8935

Fax Message [Caller-ID: 1-865-537-8935
You have received a 1 page fax at Fri, 12 Sep 2014 02:35:44 +0700.

* The reference number for this fax is atl_did1-1400166434-52051792384-154.

Click here to view this fax using your PDF reader.

Please visit www.eFax.com/en/efax/twa/page/help if you have any questions regarding this message or your service.

Thank you for using the eFax service!

       

j2 Global | eFax | eVoice | FuseMail | Campaigner | KeepItSafe | OneBox

2014 j2 Global, Inc. All rights reserved.
eFax is a registered trademark of j2 Global, Inc.

This account is subject to the terms listed in the eFax Customer Agreement.

I bet you've already guessed that the link in the message goes somewhere bad, in this case it downloads a ZIP files from cybercity-game.com/game/Documents.zip which unzips to a malicious executable Documents.scr which has a pretty low VirusTotal detection rate of 2/55.

The ThreatTrack report clearly identifies this as Cryptowall and identifies that it either downloads data from or posts data to the following locations:

188.165.204.210/1109inst2/NODE01/0/51-SP3/0/
188.165.204.210/1109inst2/NODE01/1/0/0/
mtsvp.com/files/3/install2.tar
suspendedwar.com/87n3hdh5wi04gy
suspendedwar.com/ttfvku8z7jn
goodbookideas.com/wp-content/themes/twentyeleven/111.exe
suspendedwar.com/gwfqwaratrpl2c
suspendedwar.com/h0nxfsskh0xu
suspendedwar.com/kvlfhc0hjgo6sgo

The 111.exe has a much wider detection rate of 22/53 and according the the ThreatTrack analysis of that binary there is some sort of network connection to the following IPs:

193.169.86.151
193.19.184.20

Overall, the web hosts involved are:
46.151.145.11 (Swift Trace Ltd, Crimea)
50.63.85.76 (GoDaddy, US)
76.74.170.149 (Daiger Sydes Gustafson LLC / Peer 1, US)
188.165.204.210 (OVH, France)
193.19.184.20 (PE Intechservice-B, Ukraine)
193.169.86.151 (Ivanov Vitaliy Sergeevich, Ukraine)

I would recommend blocking the following:
188.165.204.210
193.19.184.20
193.169.86.151
goodbookideas.com
mtsvp.com
suspendedwar.com