How Do Hackers Steal M365 Creds?

How the Attack Begins

Hackers first gather information about your business. They might:

• Look at your website, social media pages, and public directories.
• Find names, email addresses, job titles, and company partners.
• Search for recent news about your business, like new contracts or staff promotions.

They use this information to craft emails that look genuine. For example, if your business announces a new supplier partnership, hackers may send emails pretending to be from that supplier.

These emails are the first step in a phishing campaign. The email usually asks the employee to:

• Click a link to view or pay an invoice.
• Confirm their password due to a “security issue.”
• Log in to access a shared document.

The email might look like it came from a colleague, manager, or trusted supplier, using logos and language copied from real messages.

The Fake Login Page

When the employee clicks the link, they are taken to a fake website designed to look exactly like the Microsoft 365 login page. Hackers use:

• The same colours, logos, and fonts as Microsoft.
• A web address similar to the real one, with only small differences (for example: microsoftonline.co instead of microsoftonline.com).

Because the page looks normal, the employee thinks it is safe. When they enter their username and password, the hackers collect these credentials instantly.

Interested in what a real attack looks like?

Here is a blog that will take you through a recent attack we helped mitigate, saving an organisations entire business that they have built over the course of a lifetime!

How Hackers Use the Stolen Credentials

Once hackers have the login details, they move quickly. They:

1. Access the Microsoft 365 Account
   They log in using the stolen credentials, appearing as a legitimate user.
2. Explore Emails and Files
   They look for sensitive data like financial records, contracts, customer lists, and staff information.
3. Send Emails as the Employee
   They can send emails from the compromised account, targeting staff, suppliers, or customers to request payments, access, or confidential information.
4. Change Email Rules
   They set up hidden forwarding rules to send copies of emails externally or delete security alerts.
5. Move Laterally
   If your business uses single sign-on or integrates other services with Microsoft 365, hackers may access systems like SharePoint, Teams, CRM, or HR software.

Why This Attack Is So Effective

• Legitimate Login: Hackers use a real username and password, so systems often see the login as normal.
• Email as a Trusted Channel: Employees trust emails from colleagues or suppliers.
• No Malware Required: The attack relies on tricking people, not viruses, making it harder for basic security tools to detect.
• Global Access: Hackers hide their location using VPNs, often appearing to log in from expected countries.
• Delayed Detection: Without advanced monitoring, hackers can stay undetected for weeks or months, gathering data or planning larger attacks.

How Hackers Maintain Access

• Add New Accounts: Hackers create admin accounts so they can return even if passwords are changed.
• Use MFA Fatigue Attacks: If using simple one-tap MFA, hackers send repeated login requests, hoping the victim will approve access to stop the prompts.
• Look for Password Reuse: Hackers try the stolen password on other services like banking or apps if employees reuse passwords.
• Watch and Wait: Hackers sometimes monitor communications for weeks to plan the most profitable time to strike.

What the Impact Looks Like

If a hacker successfully compromises your Microsoft 365 account, you may experience:

• Fake invoices sent to customers, resulting in financial loss and damaged trust.
• Stolen confidential company or customer data, breaching privacy laws.
• Hackers using your account to attack suppliers or partners.
• Business disruptions if hackers delete files or change important information.
• Costs for legal advice, notifying affected parties, and restoring your systems.

Protect Your Business from These Attacks

We provide comprehensive solutions to detect and stop these threats before they damage your business. We can:

• Continuously monitor your systems for suspicious behaviour and unauthorised logins, even if the attacker uses valid credentials.
• Detect when new or unusual email forwarding rules are created, and alert you to hidden attempts to steal emails.
• Identify and respond to malicious activities in real time, blocking attackers before they can steal data or cause harm.
• Automatically isolate infected or compromised devices from the network to prevent the spread of an attack.
• Analyse threats using advanced detection techniques, including machine learning and behaviour analytics, to find attacks that traditional antivirus tools miss.
• Provide detailed reports on suspicious activities, so you know exactly what happened, which systems were affected, and how we stopped the attack.
• Offer continuous updates and improvements to detection methods to stay ahead of new and evolving attack techniques.
• Help you recover quickly after an incident by removing malicious files, cleaning up systems, and ensuring attackers cannot regain access.
• Support your compliance requirements by logging incidents, responses, and actions taken to protect your data.
• Assist with employee security awareness training to reduce the risk of successful phishing attacks in the future.

How to Defend Your Business

1. Multi-Factor Authentication (MFA): Require a second factor like an app-generated code or hardware token.
2. Advanced Monitoring Tools: Use our managed services to detect unusual logins, stop suspicious activities, and report breaches.
3. Regular Staff Training: Teach employees to spot phishing emails, avoid clicking unknown links, and report suspicious messages.
4. Restrict Access: Limit each employee’s access to what they need, avoiding broad admin privileges.
5. Regular Password Changes and Policies: Require strong, unique passwords and encourage the use of password managers.
6. Incident Response Plan: Have a clear plan for compromised accounts, including contact steps, password resets, and notification procedures.
7. Work with Security Professionals: Partner with us to monitor systems, detect threats early, and keep your security up to date.