Secure your Microsoft 365 Once And For All

Beyond MFA & Spam Filters: Understanding Your True Exposure 

One of the most common questions we hear is, “We already have a spam filter and MFA, so why do we need this?” The answer is simple: those tools solve different problems and are completely blind to modern account takeover techniques. 

Spam Filter vs. Identity Monitoring 

• A Spam Filter’s Job: A spam filter sits outside your inbox and acts like a bouncer, trying to block malicious emails, phishing links, and junk mail from ever reaching your users. Its primary function is to prevent the delivery of known bad content. 

• The Gap It Leaves: Once a hacker gains access to an account—by bypassing MFA or using stolen credentials—the spam filter is useless. The attacker is now inside your house. They can send emails from the legitimate account, access data, and set up forwarding rules. The spam filter has no visibility into what happens within a compromised account. 

• How “Sentinel for M365” Fills the Gap: Our service monitors activity inside the M365 tenant. We detect when a hacker logs in, creates a suspicious inbox rule to hide their activity, or starts accessing files in an unusual pattern or from an unusual location. We spot the intruder after they’ve gotten past the bouncer – and then we kick them out quickly. 

Multi-Factor Authentication (MFA) vs. Token Theft 

• MFA’s Job: MFA is designed to verify your identity at the point of login by requiring a second factor, like a code from your phone. It proves you are who you say you are at that moment. 

• The Gap It Leaves (Token Theft): Modern attacks don’t always try to break your password. Instead, they focus on Token Theft, also known as session hijacking. When you log into M365, a “session token” is created and stored in your browser. This token is what keeps you logged in without having to re-enter your password on every screen. Hackers use sophisticated “Attacker-in-the-middle” attacks to steal this active session token. With the token, they can paste it into their own browser and gain immediate, authenticated access to your account. MFA is completely bypassed because the session is already authenticated. 

• How “Sentinel for Microsoft 365” Fills the Gap: We don’t just watch the front door; we watch what happens after someone is inside. Our service detects the impossible. When a hacker in Eastern Europe uses a stolen token to access an account that was legitimately used in Chicago five minutes prior, we see this “impossible travel” scenario. We detect suspicious logins from anonymous VPNs and unusual locations, allowing us to identify a session hijack and lock the account down instantly. 

Conditional Access Isn’t Enough: The Need for Active Monitoring 

Another layer of M365 security is Conditional Access, a feature that allows you to set rules, such as blocking logins from certain countries or requiring compliant devices. It’s a valuable tool for setting policy, but it suffers from a critical flaw: no one is watching. 

Conditional Access is like setting a rule that no one can enter a building after 10 PM. It’s a static policy. But what if someone finds a way to circumvent that rule or piggyback their way in? If there are no security guards watching the monitors, the breach goes completely unnoticed. You’re still hacked, and you won’t know about it until the damage is done. 

Sentinel for Microsoft 365 is the security guard. We are the “eyes in the sky” watching over your M365 tenant 24/7. Our human-led team analyzes every authentication, every new inbox rule, and every permission change. When an attacker bypasses a Conditional Access policy or finds a loophole, we don’t just rely on a static rule—we see the anomalous behavior in real-time and take immediate action to neutralize the threat and evict the intruder. 

The Catastrophic Cost of a Single Compromised Account 

It’s difficult to overstate the damage an attacker can do with access to just one Microsoft 365 user account. It’s not just about email; it’s the master key to your digital kingdom. 

Imagine a hacker gaining access to your account. Instantly, they have: 

• Your Entire Email History: They can read every message, learning your communication patterns, identifying key financial contacts, and understanding your business processes. 

• Your Contacts & Calendar: They know who you talk to, who your most important clients are, and when you are out of the office. This is the perfect reconnaissance for a devastating Business Email Compromise (BEC) attack, where they impersonate you to request fraudulent wire transfers from your clients or finance department. 

• Your OneDrive Data: Every file you have stored—contracts, financial statements, intellectual property, employee records—is now in their hands, ready to be exfiltrated and sold or held for ransom. 

• Your SharePoint & Teams Access: The hacker can now move laterally through your organization, accessing shared company-wide data, poisoning internal documents with malware, and spying on sensitive team conversations. 

Now, amplify this threat with Artificial Intelligence. The modern attacker doesn’t need to manually sift through thousands of emails. They can deploy AI tools to instantly scan your entire mailbox and file system for keywords like “invoice,” “password,” “wire transfer,” or “acquisition.” Within minutes, the AI can arm the hacker with the most sensitive data and the perfect context to launch a highly convincing and catastrophic attack. The speed and scale of the damage are unlike anything we’ve seen before. 

Features and Benefits: Your 24/7 M365 Security Shield 

Sentinel for Microsoft 365 is a fully managed service that provides continuous identity protection, backed by our expert Security Operations Center. 

Key Service Features: 

• 24/7/365 Human-Led Monitoring: Our security analysts are always watching, analyzing alerts, and separating the real threats from the noise. 

• Real-Time Threat Detection: We analyze login attempts, authentication requests, and directory activity for suspicious patterns. This includes detecting impossible travel, logins from risky locations, and the use of anonymous proxies. 

• MFA Bypass & Token Theft Detection: Our platform is specifically designed to identify the techniques used in session hijacking, providing a critical layer of security that MFA alone cannot. 

• Malicious Inbox Rule Detection: We instantly spot the creation of inbox rules designed to forward sensitive emails, hide replies, or auto-delete messages, which are hallmark signs of an account takeover. 

• Rogue OAuth Application Discovery: We identify when users grant permissions to malicious third-party apps (“Traitorware”) that can be used to steal data and maintain persistent access to your M365 tenant. 

• Rapid Incident Response: When a credible threat is detected, we don’t just send an alert. We take immediate action to contain the threat, such as disabling the compromised account, forcing a password reset, and revoking malicious sessions to prevent further damage. 

• Turnkey Deployment & Management: There is absolutely nothing for you to configure or manage. Our team handles the entire setup process, which can be completed in minutes, and provides all ongoing management and monitoring.