Advisory: Office 365 Password Spraying

Advisory Office 365 Password Spraying

What is it?

Password spraying is a type of brute-force attack in which a malicious actor uses a single password against targeted user accounts before moving on to attempt a second password, and so on. This technique allows the actor to remain undetected by avoiding rapid or frequent account lockouts.

See: https://attack.mitre.org/techniques/T1110/

Why are we posting this?

Yesterday we identified thousands, yes thousands of attempts to access unique client Office 365 accounts from Eastern Europe and Asia. Upon identification of IP’s we notified Microsoft.

There were and still are no signs of access and/or compromise, but we continue to monitor all logs.

What should you do?

Secure your systems, or have that conversation with us to help secure your systems.

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