Business leaders must be aware of a critical cybersecurity threat targeting organizations through Microsoft Office 365. Two sophisticated ransomware groups are exploiting email bombing and tech support impersonation (aka vishing) to infiltrate systems.

How the Attack Works

• Attackers use email bombing to overwhelm inboxes, then pose as tech support via Microsoft Teams

• Remote access tools are used to install malware and steal data

Recommended Mitigation Steps

• Restrict Microsoft Teams calls from external organizations

• Enhance employee awareness training to include vishing tactics

• Implement robust email filtering systems

• Regularly update and patch all systems

• Enforce strong authentication measures, including multi-factor authentication

• Establish and practice an incident response plan

It’s crucial to act swiftly to protect your organization.

We encourage you to reach out to your trusted technology partners or managed security service providers to:

• Conduct a comprehensive security assessment

• Implement advanced threat detection and response solutions

• Provide ongoing monitoring and support

Remember, cybersecurity is an ongoing process, not a one-time fix. 

Stay vigilant and prioritize the protection of your organization’s digital assets. Your proactive approach today can prevent significant losses tomorrow.

CTS offers solutions that integrate with and strengthen Microsoft Teams.

For help with your business communications, contact CTS today at 800.787.4848 or jnolte@ctsmd.us.