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SMTP to the Internet

This rule detects events that may describe SMTP traffic from internal hosts to a host across the Internet. In an enterprise network, there is typically a dedicated internal host that performs this function. It is…

Description

This rule detects events that may describe SMTP traffic from internal hosts to a host across the Internet. In an enterprise network, there is typically a dedicated internal host that performs this function. It is also frequently abused by threat actors for command and control, or data exfiltration.

Detection logic

Its licence does not clear it for publishing here

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Detection requirements

Platform
ESXiIaaSLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

Known benign triggers

  • NATed servers that process email traffic may false and should be excluded from this rule as this is expected behavior for them. Consumer and personal devices may send email traffic to remote Internet destinations. In this case, such devices or networks can be excluded from this rule if this is expected behavior.

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