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Thursday 11 September 2014

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!


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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:

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:

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

I would recommend blocking the following:

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