How to protect Microsoft 365 users from ‘under the surface’ file-based attacks with FileWall
Published Mar 01 2023 09:20 AM 3,288 Views
Copper Contributor

In this guest blog post, Omri Eytan, CTO of odix, discusses how businesses relying on Microsoft 365 can protect themselves from file-based attacks with Filewall, available via Microsoft Azure Marketplace.


Many theses were written about the latest pandemic impact on our working habits, preferences, and how companies had to adopt new processes to keep business alive.  


We see numerous reports describing the work-from-home trend becoming the new reality of hybrid working environment. This had a huge impact on IT departments, which had to enable a secured yet transparent working environment for all employees, wherever they work. A McAfee Report showed a 50 percent increase in cloud use across enterprises in all industries during COVID while the number of threat actors targeting cloud collaboration services increased 630 percent for the same period!


Furthermore, the reports highlighted the increase in number of threats mainly targeted collaboration services such as Microsoft 365. 


Microsoft 365 security approaches: attack channel vs. attack vector protection 

To begin with, businesses must take responsibility for their cloud SaaS deployments when it comes to security, data backup, and privacy. Microsoft 365 business applications (Exchange Online, OneDrive, SharePoint, and Teams) are no different. 


Security solutions offering protection for Microsoft 365 users can be divided into two main methodologies: 

  • Protecting attack channel: dedicated security solutions designed to protect users from various attack vectors within a specific channel such as email. The email channel has many third-party solutions working to protect users against various attack vectors such as phishing, spam, and malicious attachments. 
  • Protecting attack vector: advanced security solutions aiming to protect users from a specific attack vector across multiple channels such as email, OneDrive, and SharePoint. 

These approaches remind us of an old debate when purchasing IT products: Should the company compromise a bit on innovation and quality and purchase a one-stop-shop type of solution, or is it better to choose multiple best-of-breed solutions and be equipped with the best technology available? 


Security solutions for Microsoft 365 are no different. 


Protecting Microsoft 365 users against file-based attacks  

This article focuses on one of the top attack vectors hackers use: the file-based attack vector. Research shows the top file types used to embed malware in channels like email are commonly used, like Word, Excel, and PDF. Hackers use these file types because people tend to click and open them naturally. When malicious code is embedded well (e.g., in nested files), the file bypasses common anti-malware solutions such as anti-virus and sandbox methods that scan files for threats and block the files if malware was detected.  


Deep file analysis (DFA) technology, introduced by odix, was designed to handle all commonly used files and offers a detectionless approach. With DFA, all malware, including zero-day exploits, is prevented and the user gets a safe copy of the original file.  


What are DFA and CDR? 

DFA or CDR (content disarm and reconstruction) describes the process of creating a safe copy of an original file by including only the safe elements from the original file. CDR focuses on verifying the validity of the file structure on the binary level and disarms both known and unknown threats. The detectionless approach ensures all files that complete the sanitization process successfully are malware-free copies and can be used safely. 


odix, an Israel-based cybersecurity company driving innovation in content disarm and reconstruction technology, developed the FileWall solution to complement and strengthen existing Microsoft security systems. FileWall, available in Microsoft AppSource and Azure Marketplace, helps business users easily strengthen Microsoft 365 security within a few clicks. 


How FileWall works with Microsoft security technology  

FileWall integrates with the Microsoft Graph security API and Microsoft Azure Sentinel, bringing malware protection capabilities with an essential added layer of deep file analysis technology containing CDR proprietary algorithms. 


FileWall blocks malicious elements embedded in files across Microsoft 365 applications including Exchange Online, SharePoint, OneDrive, and Teams. The unique DFA process is also extremely effective in complex file scenarios such as nested files and password-protected attachments where traditional sandbox methods could miss or result in lengthy delays and disruption of business processes. 




Empowering Microsoft 365 security: granular filtering per channel  

FileWall includes a modern admin console so the Microsoft 365 administrator can set security policies and gain overall control of all files and attachments across Exchange Online, SharePoint, OneDrive, and Teams. The FileWall file type filter lets the admin define which file types are permitted in the organization and which should be blocked. This minimizes the attack surface the organization is exposing via email and collaboration services by eliminating the threat vectors available in certain file types.   


The type filter has three main controls:  

  • On/off: enabling or disabling the filter functionality on all file types 
  • Work mode: the ability to create preset lists of permitted and non-permitted file types for specific users within the organization 
  • Default settings: suggested default policy by FileWall which includes204 file types categorized as dangerous, including executable files (*.exe), windows batch files (*.bat), windows links (*.lnk), and others   


How FileWall complements Defender’s safe attachments 

As a native security solution within the Microsoft 365 deployment, FileWall doesn't harm productivity. Consequently, all FileWall’s settings have been configured to complement  Microsoft 365 Defender. Combining the two products provides high levels of security with multi antivirus, sandbox, and CDR capabilities. While the sandbox can manage executables and active content, FileWall handles all commonly used files such as Microsoft Office, PDF, and images. As most organizational traffic consists of non-executable documents, this method can reduce sandbox load by 90 percent to 95 percent, lowering total costs and improving the average latency.   


FileWall enhances the existing Microsoft type filter and allows additional granular controls over the types of files that are allowed to enter the organization while enforcing these restrictions on nested and embedded files as well. 




Call for Certified Microsoft CSPs who wish to increase revenues  

FileWall for Microsoft 365 is available for direct purchase through Microsoft AppSource, Azure Marketplace, or via the FileWall-certified partner program for Microsoft CSPs. 


Microsoft CSPs can bundle FileWall via Microsoft Partner Center for their customers. odix offers generous margins to Microsoft CSPs who joined the FileWall partner program.  


FileWall-certified partners are eligible for a free NFR license according to odix terms of use. 

Version history
Last update:
‎Mar 01 2023 09:22 AM
Updated by: