Exchange PowerShell Cmdlet History Deleted — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-10-26 / 2022-12-30.

{
  "category": "file_delete",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 175ab703cdab562d894996e225dff7d3248af3b0c49c75a5fea5f01debc71f00

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Exchange PowerShell Cmdlet History Deleted
id: a55349d8-9588-4c5a-8e3b-1925fe2a4ffe
status: test
description: Detects the deletion of the Exchange PowerShell cmdlet History logs which may indicate an attempt to destroy forensic evidence
references:
    - https://m365internals.com/2022/10/07/hunting-in-on-premises-exchange-server-logs/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-10-26
modified: 2022-12-30
tags:
    - attack.stealth
    - attack.t1070
logsource:
    category: file_delete
    product: windows
detection:
    selection:
        TargetFilename|startswith: '\Logging\CmdletInfra\LocalPowerShell\Cmdlet\'
        TargetFilename|contains: '_Cmdlet_'
    condition: selection
falsepositives:
    - Possible FP during log rotation
level: high

Original YAML and metadata in JSON

False positives

• Possible FP during log rotation

Source references

• https://m365internals.com/2022/10/07/hunting-in-on-premises-exchange-server-logs/