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Blocking a mass spam attack (updated)

Recently a new trend has emerged where criminals are attempting to hide their activity behind a barrage of spam email to the compromised mailbox or to any popular mailbox in the domain.

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Attack Surface Reduction = Zero Day Protection

Attack Surface Reduction (ASR) rules have expanded to include a full range of zero-day protections. If you aren't using them today or haven't tried to use them recently, then it's time to look again. If you aren't locking down Windows natively then you're missing out on critical security features.

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Don’t change the threat actions in anti-virus policy

Students in the Defender XDR course were advised not to alter threat actions in their anti-virus policy, leaving them as Not configured. This allows Defender to use its default behaviors, local device settings, signature-defined actions, and automatic remediation. Relying on Microsoft's security expertise ensures optimal threat management.