Customers are receiving emails containing a link to malicious software. These emails are subverting spam filters. The email reads as follows:
Delivered-To: [email protected]
Received: by 10.14.120.205
Mon, 1 Nov 2010 11:15:24 -0700 (PDT)
Received: by 10.231.31.193
Mon, 01 Nov 2010 11:15:23 -0700 (PDT)
Return-Path: <[email protected]>
Received: from 127.0.0.1 for <[email protected]>; Mon, 1 Nov 2010 13:15:14 -0500 (envelope-from <[email protected]>)
Received: by smtpex.example.com (SMTP READY)
with ESMTP (AIO); Mon, 01 Nov 2010 13:15:14 -0500
Received: from 172.18.45.122 by 192.168.2.55; Mon, 1 Nov 2010 13:15:14 -0500
From: Company <[email protected]>
To: “[email protected]” <[email protected]>
Date: Mon, 1 Nov 2010 13:15:11 -0500
Subject: New Insurance Application
Thread-Topic: New Insurance Application
Please download and install software from the site below to maintain full access to your account.
www.examplesite.com
________________________________
Additional information: The authorized mail servers IPs are 192.168.2.10 and 192.168.2.11.
The network’s subnet is 192.168.2.0/25.
Which of the following are the MOST appropriate courses of action a security administrator could take to eliminate this risk? (Select TWO).
A.
Identify the origination point for malicious activity on the unauthorized mail server.
B.
Block port 25 on the firewall for all unauthorized mail servers.
C.
Disable open relay functionality.
D.
Shut down the SMTP service on the unauthorized mail server.
E.
Enable STARTTLS on the spam filter.