Defend against this new Office 365 threat

Posted on Wednesday January 22, 2020

Some hackers have become so skilled that they don't even need you to give up your credentials to hack into your account. One recent cyberthreat is targeted towards users of Microsoft Office 365. You don't want to be the next victim, so read up.

A phishing scam that harvests users' credentials

The latest cyberattack on Microsoft Office 365 involves harvesting users' credentials. Scammers use this previously unseen tactic by launching a phishing message to users, asking them to click on an embedded link. What makes this scam more insidious than traditional phishing scams is that the URL within the message links to a real Microsoft login page.

How does it work?

The phishing message resembles a legitimate SharePoint and OneDrive file-share that prompts users to click on it. Once they do, they are taken to an Office 365 login page where they will be asked to log in if they haven't already.

After they've logged in, they'll be prompted to grant permission to an app called “0365 Access.” Users who grant permission effectively give the app - and the hackers behind it - complete access to their Office 365 files, contacts, and inbox.

This technique can easily trick lots of users since the app that requests access is integrated with the Office 365 Add-ins feature. That means that Microsoft essentially generates the request for permission. No, Microsoft is not aiding hackers to breach systems. Rather, the scam is made possible by a feature that allows users to install apps that are not from the official Office Store.

Ways to protect your Office 365 account - and your business

Given their fairly advanced approach, these scammers could effortlessly prey on careless employees. There are ways to make sure that doesn't happen.

• Always check the email's sender account before clicking on any link or granting apps access.
• Implement a policy that prevents staff from downloading and installing apps that are not from the Office Store.
• Regularly conduct security awareness training that covers essential cybersecurity topics. Educate employees on how to spot phishing scam red flags (e.g., unknown senders, grammatical and typographical errors, suspicious requests, and the like). Increase their knowledge about more sophisticated attacks and keep everyone informed about current and future cybersecurity risks.

Successful attacks could result in an unimaginable catastrophe to your company. For tips on how to spot this and other nefarious scams and how to plan thorough security practices, contact our experts today.