Detection rules › Sigma
Exchange PowerShell Cmdlet History Deleted
Detects the deletion of the Exchange PowerShell cmdlet History logs which may indicate an attempt to destroy forensic evidence
Known false positives
- Possible FP during log rotation
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth |
Telemetry coverage
Rule body
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
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
TargetFilename|startswith: '\Logging\CmdletInfra\LocalPowerShell\Cmdlet\'
TargetFilename|contains: '_Cmdlet_'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
TargetFilename | match |
| field:"TargetFilename" kind:match value:"_Cmdlet_" |
TargetFilename | starts_with |
| field:"TargetFilename" kind:starts_with value:"\Logging\CmdletInfra\LocalPowerShell\Cmdlet\" |