Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: InfoSec Handlers Diary Blog - Internet Storm Center Diary 2018-01-20 InfoSec Handlers Diary Blog


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An RTF phish

Published: 2018-01-20
Last Updated: 2018-01-20 22:36:00 UTC
by Didier Stevens (Version: 1)
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I received another RTF file (with .doc extension) via email. Let's take a look with rtfdump:

It looks like there are no embedded objects, let's make sure by filtering:

There are no embedded objects, or they are so heavily obfuscated that rtfdump doesn't find them. To exclude this hypothesis, we look for hexadecimal digits:

Some of the sequences (like 17 and 18) contain 1329 hexadecimal characters, but only strings of 5 or 6 contiguous hexadecimal characters.

Either this is extremely obfuscated, or it doesn't contain exploits, but is rather phising.

Searching for URLs:

Indeed, it is phishing (NetEase / 163 is a Chinese Internet company):

 

Didier Stevens
Microsoft MVP Consumer Security
blog.DidierStevens.com DidierStevensLabs.com

Keywords: maldoc phishing rtf
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