Huge breaches have become so common that it's tempting for users to write them off as no big deal. Take Facebook's recent announcement that hackers made off with personal info of 30 million users of the platform. How bad can it be for someone to have access to the kind of basic information we all share with hundreds or thousands of our friends, anyway? It's not bank account info or Social Security numbers, right?

Well, it is a big deal — not because of what might happen on Facebook but because of how the thieves can use the information to launch spearphishing attacks. Even if you quickly changed your password to protect your privacy on Facebook, a fleeting snapshot of your Facebook activity — your name and employer, your LinkedIn URL, your religion, the people you follow, and your most recent searches — will give a good spearphisher more than enough information to craft a nearly irresistible bogus email: "Hi, Kowsik. I see that you love that new Spanish restaurant downtown. I just found a foodie site that's offering a coupon for a free meal!"

Or if you are a fan of the New York Times, you might receive an emailed security alert that appears to be from the newspaper warning you to change your password. If you clicked on a link in that email, you'd land at a legit-looking landing page where you might very well hand over your username and password — which, chances are, are the same credentials you use for your bank, your doctor, and to get on your employer's network.

For a bad guy, it's a simple, diabolically effective combination. For starters, research shows that spearphishing works. Twelve percent of all users will open a phishing email, and 4% will always click a link in a phishing email, according to Verizon's 2018 Data Breach Investigations Report. Corporate employees using their corporate email are a bit more circumspect, but still vulnerable. In the last 30 days, employees at our customers' businesses clicked on 1.2% of the URLs included in phishing emails. That's a high success rate, especially because accessing a corporate network makes targets of all of your fellow employees.

Breaches of major social networks will fuel the growth of the spearphishing scourge. After all, it makes for some easy pickings. Some types of cyberattacks, such as watering hole attacks, require victims to happen upon a malware-carrying website. But everyone uses email. And criminals are just like the rest of us — they don't want to work any harder than they have to. If they have information on what is top of mind for millions of people, why would they bother with more tiresome approaches?

It's no wonder that spearphishing is on the rise around the world. In Singapore, for example, the number of spearphishing attacks made via e-mail impersonation scams rose 20% from 2015 to 2016 (the latest data available), according to the Singapore Computer Emergency Response Team. In September, the FBI issued a warning about a rise in spearphishing attacks in which supposed human resources representatives tap directly into victims' bank accounts. Just a few weeks ago, Vanderbilt University News warned students and faculty to be on the alert of increased spearphishing activity.

Take These Steps
So, if spearphishing is a fact of life in the age of social networks, what can you do to protect yourself? Quite honestly, the only foolproof defense is to not use email. Short of that, here are some best practices:

1. Have a healthy skepticism for emails offering awards and gift vouchers. Better yet, ignore them — and certainly don't click on any links.

2. Beware of any email referencing something you posted about on Facebook or another social network, especially if you know they've been hacked. That should make your antenna go up in a big way. Be afraid — very afraid.

3. Never click on embedded links in emails — even if it appears to be from your bank, cable company, or another trusted vendor. You can always log on to those sites yourself to take care of whatever pressing business is at hand.

4. Don't use open authentication programs. Yes, it is extremely convenient to log on to sites or apps using your Facebook or Google credentials. But take the time to create your own username and password. Most people don't realize that this service allows the app developer to access Facebook on your behalf. In other words, a hacker wouldn't need to breach Facebook's defenses to see your information there — just breach that app developer.

5. Insist on good spearphishing hygiene from the companies you do business with. If that bank or cable company sends you an email with an embedded link, lodge your complaint. Tell them to direct you to log on to the site directly. If more vendors were pressured to adopt this policy, the link-clicking economy would fall apart.

6. Create fake email accounts to join social networks. Since you're never likely to check the account again, chances are you'll never see any spearphishing attacks that arrive there. And don't feel too guilty. After all, the social network's business model is probably based on monetizing your personal information.

Related Content:

Black Hat Europe returns to London Dec. 3-6, 2018, with hands-on technical Trainings, cutting-edge Briefings, Arsenal open-source tool demonstrations, top-tier security solutions, and service providers in the Business Hall. Click for information on the conference and to register.