Exchange PowerShell Cmdlet History Deleted

Severity: high
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects the deletion of the Exchange PowerShell cmdlet History logs which may indicate an attempt to destroy forensic evidence

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1070` Indicator Removal

Event coverage

Provider	Event ID	Title
Sysmon	23	FileDelete (File Delete archived)
Sysmon	26	FileDeleteDetected (File Delete logged)

Stages and Predicates

Stage 1: `selection`

TargetFilename|contains: _Cmdlet_
TargetFilename|startswith: '\Logging\CmdletInfra\LocalPowerShell\Cmdlet\'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.