huntrule

Windows Exchange PowerShell Cmdlet History Log Files Deleted

Flags deletion of Exchange PowerShell cmdlet history log files in the expected logging directory.

FreeReviewedSigma · High · v2
Product
windows
Category
file_delete
Author
Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2022-10-26
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule matches file deletions of Exchange PowerShell cmdlet history log files under a specific directory path. Attackers may remove these logs to reduce visibility into PowerShell activity and hinder forensic investigation. Telemetry relies on Windows file deletion events capturing the deleted target filename.

Reporting behind it

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Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.