PowerShell used to export mailbox contents

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	Requires one of the following data sources: Windows Event Collector OR XDR Agent with eXtended Threat Hunting (XTH)
ATT&CK Tactic	Collection (TA0009)
ATT&CK Technique	Data Staged: Local Data Staging (T1074.001)
Severity	Medium

Description

An attacker may use PowerShell to export the contents of a mailbox as part of the data staging before exfiltration.

Attacker's Goals

Export the content of a mailbox, preparing for data exfiltration.

Investigative actions

• Examine the PowerShell command to identify which mailbox has been exported.
• Verify that this command was executed by a trusted source.