PowerShell used to remove mailbox export request logs

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	Execution (TA0002)
ATT&CK Technique	Command and Scripting Interpreter: PowerShell (T1059.001)
Severity	High

Description

An attacker may use PowerShell to remove evidence of an export request for a mailbox as part of the clean-up stage.

Attacker's Goals

Remove evidence for mailbox export commands.

Investigative actions

• Examine the PowerShell command to identify which mailbox has been compromised.
• Investigate the host that executes the command for potential further exploitation.