From: eFax Corporate [message@inbound.efax.com]
Date: 25 July 2014 14:25
Subject: eFax message - 4 pages
Fax Message [Caller-ID: 948-468-7596]
You have received a 4 pages fax at 2014-07-25 13:24:21 GMT.
* The reference number for this fax is latf1_did11-1187609582-1911573644-58.
View this fax using your PDF reader.
Click here to view this message
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In this case the link in the email goes to verzaoficial.com/css/fax_390392029_072514.exe which downloads a file with a VirusTotal detection rate of just 1/45. Automated analysis [pdf] is fairly inconclusive as to what it does.
4 comments:
so what can we do to filter/block them without blocking our actual efax emails?
You should be able to block .scr files and block it. It shows the icon of a PDF file but it's actually a .scr file (an executable screensaver)
Also,
If the domain is the same as the one we got, if you have a web filter you could block http://sendgrid.org (the legit site is sendgrid.com)
A real fax notification from eFax would include a Fax attachment as a PDF, TIFF or EFX. The email wouldn't contain a (fake) link to read the fax.
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