[ISN] Word Macro PGP Key Trojan

From: Fred Cohen <fc@all.net>
Subject: New attack on PGP keys with a Word Macro

I just got a look at a Word file (CALIG.DOC) that contains user IDs and
passwords to pornographic sites.  In addition to these pointers, it has a
Trojan Horse that finds the user's private PGP key ring and ftp's it to: 

        209.201.88.110 (codebreakers.org)
        user anonymous
        password itsme@
        directory incoming
        binary mode
        stored name: NewSecRingFile[0-9][0-9][0-9][0-9]

This Trojan does its job in visual basic and - except for the initial
notice (if enabled) that macros are present - gives no indication of this
function that it performs. I figure the best defense against this is to: 

1) Have thousands of users ftp phony files to that IP address
   and filename on a regular basis, thus making it impossible to
   get any real PGP keys - preferably send valid-looking PGP keys
   so they have to waste a lot of time cracking them.

2) Cut off all service for ftp with 209.201.88.110 (codebreakers.org)
   - either at the ISP, at your gateway, or at the borders to your country.

3) Prosecute for possession of access devices - with international
   cooperation between authorities.

4) Tell your people that this has been done so they will stop looking at
   pornography listing files fat chance this will work).

At any rate, I hope that you will take prudent precautions within your
organization against this potential attack on the security of your private
keys. 

Fred Cohen & Associates: http://all.net - fc_at_all.net - tel/fax:925-454-0171


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