Month: September 2019

Last time we looked at the reasons one needs to distrust all email. Here we continue with two more methods you can use to make sure you don’t get phished.

Digging deeper

Email servers use standardized ways to relay and deliver mail. Every time a server acts on a message, it adds a header to the message describing what it has done. Your email client, whether it is web mail, Outlook or some other, hides most of these headers for you. If it didn’t, you would have to wade through dozens of lines of server dialog to get to the message body.

But we can use these headers to our advantage, if we believe the message may be forged, fake or malicious. Your mail app provides a way to view the headers in their entirety. The steps are different for each app, but MxToolBox provides a page describing them all. Just click on your mail app in the left column and follow the steps provided.

Once you have the headers before you, you should be able to find the To, From, Date, and Subject headers in a group near the bottom. Start from there and work your way up. Very often the next line or two will answer the question.

• Examine the Received From headers. Are the mail servers shown from other countries than where the sender is located? If the last letters after the last dot are not .com, .net, or .org, they will frequently be “country codes”. These are two-letter codes that are assigned to each nation in the world, for example, “.us” – United States, “.br” – Brazil, “.cn” – China. (For a complete list, refer to the ICANNWiki page.) A message from a source somewhere in the States should not have any Received From headers with server names like mail.xyz123.ru.
• The part of the From address after the “@” should match the business domain name. For example, all messages from ComputAssist should have “@computassist.com” as the ending of the address. If it does not, it likely did not originate here.
• If there is a Reply-To address header, does it differ from the From address? This is a way to hijack your reply to a hidden address.
• Still not sure? Look for headers with SPF and DKIM results. The ideal result of these validation tests is a Pass score. A safe message may not always have a pass score, but fake ones never do.

Attachments can be dangerous

One way for phishers to get you hooked is to attach a malicious file to the message. Click it, and the attack on your computer and network begins. These attacks can appear quite genuine. It might look like a bank statement, or an invoice from a supplier, complete with corporate logo and boilerplate fine print.

• Never trust an attachment that you were not expecting.
• Even if it appears to be familiar, such as a monthly invoice, use the other techniques here to verify the authenticity of the message first!
• Be especially careful with Office documents which can contain code that runs on your computer when opened.

Everyone who uses email is potentially a phishing target. These techniques will go a long way in keeping you from becoming a victim.

An accountant in a small business office receives an email from her boss: “Please purchase (locally) some gift cards, scratch off the numbers, photocopy and send them to me by email. They are for giving to a person in need. I need this done immediately.” Everything looks believable including the salutation and the signature. But the request is unusual. The boss has never asked this before, and the accountant is not the person who normally would be making local purchases.

With email, lose your trusting nature

The above is an example of a phishing email scam. Phishing is a step beyond simple forging. It’s an attempt to use the appearance of credibility to fool the recipient into cooperating with the attacker. Messages are crafted to look like they come from known sources. They may use familiar corporate logos and colors, the names of others at your workplace, the From: address may even be in your address book. In the case above, the From address was familiar, but the Reply-to address (where a reply to the message would be sent) was an unknown party.

Because email phishing is one of the most common attack methods today, every person on the staff of any organization is a key part of the corporate defensive strategy. One slip could invite malware or ransomware into the whole network.

Phishing attacks get more sophisticated every day. As a user of email in a workplace, you need to up your game accordingly. Here are the top four tips on how to avoid getting phished.

1. Check your own awareness

Common phishing emails appear to be messages from co-workers, shipping company tracking numbers, invoices from known suppliers, and account notifications from online stores and financial institutions. Keep your guard up. You may not normally be a suspicious person. However skeptical you normally are, be more wary than usual when working with email. It’s a shame, but you must treat everything in your inbox as a potential threat to your organization.

Any visible part of an email can be faked. The From: address, the signature, familiar names and logos don’t prove the origin of the message. In a phishing message, all the dirty work is hidden. No matter how innocuous it looks, always use secondary means to verify a message’s authenticity.

2. Check clickable links

One giveaway of a phishing attempt is deceptive clickable links. On most computers, if you place your mouse pointer over a link but do not click, the actual destination address will be shown in a tool tip (pop-up text.) If the visible destination and the tool tip don’t match, you should become suspicious. For example, the link as shown in a message appears to be www.computassist.com, but when you hover your mouse over it, the tool tip displays svr3.doogielt.cn. This is a huge red flag – don’t click!

Check link spelling very carefully. For example, can you tell the difference between paypal.com and paypaI.com? (Depending on your browser’s default font, they may appear the same. The second link has a capital I in place of the l.)

If you receive an email asking you to update your account information on a frequently used site, don’t click the links in the email. Use your bookmark to that site instead.

Next time we will look at two more tips to keep you among the un-phished.