Learn about the latest cyber threat
A new threat has emerged that is putting businesses at serious risk: Office 365 token theft. This sophisticated form of cyberattack has the potential to bypass even the most robust security measures, including Multi-Factor Authentication (MFA), which many organisations rely on to protect their sensitive data.
What is Token Theft?
When you log into Office 365, your credentials generate an authentication token, which allows you to access various services without needing to re-enter your password each time. While this token is designed to streamline your experience, it also represents a significant security risk if it falls into the wrong hands.
Cybercriminals have developed methods to steal these tokens, either by tricking users into clicking on phishing links or by exploiting vulnerabilities in the software. Once a token is stolen, the attacker can gain full access to your Office 365 account without needing your password or even your MFA verification!
How Does Token Theft Bypass MFA?
Multi-Factor Authentication is designed to add an extra layer of security by requiring a second form of verification, such as a text message or an authentication app. However, token theft circumvents this by allowing attackers to authenticate themselves as you, using your stolen token. This effectively nullifies the protection offered by MFA, as the token gives them direct access to your account, bypassing any additional security measures.
The Risks to Your Business
The consequences of token theft can be severe. Once an attacker has access to your Office 365 account, they can:
- Read and send emails: this can be used to further the attack within your organisation or target your contacts.
- Access sensitive files: if your Office 365 account is linked to OneDrive or SharePoint, the attacker can download or alter critical documents.
- Spread malware: they can distribute malicious software through your account, potentially causing widespread damage across your network.
- Launch phishing attacks: by using your compromised account, attackers can launch more convincing phishing attacks on others within your organisation.
Protecting Your Business
Given the significant risks associated with token theft, it’s crucial to take proactive steps to protect your business. While MFA is an essential security measure, it’s important to recognise its limitations in the face of token theft.
One effective solution to combat this threat is Duo Security, a platform that adds another layer of protection beyond MFA. Duo monitors the health of devices before they connect to your network, ensuring that only trusted devices can access your Office 365 account. It also offers adaptive authentication, which analyses the context of each login attempt—such as the location or device being used—and can prompt for additional verification if anything seems suspicious.
Next Steps
At Carden IT Services, we’re committed to keeping your business secure. If you’re concerned about the risks of Office 365 token theft or would like to learn more about how Duo Security can enhance your protection, please don’t hesitate to contact us. We’re here to help you stay one step ahead of the latest cybersecurity threats.
