huntrule

Suspicious Mass Windows Event Log Clearing via PowerShell (via ps_script)

PremiumReviewedSigma · High · v1
Product
windows
Category
ps_script
Author
HuntRule
Published
2026-09-07
Updated
2026-09-07
AnalysisDetection

ATT&CK techniques

  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 detects a PowerShell one-liner enumerating all event logs and clearing them through the EventLogSession GlobalSession ClearLog method. Qilin ransomware operators used this to wipe forensic evidence across every log on compromised hosts.

Reporting behind it

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Suspicious Windows Event Log Cleared via wevtutil during Ransomware Staging (via process_creation)
Suspicious Deletion of Terminal Server Client History via reg by UNC1549
Suspicious Windows Event Log Clearing via process_creation
Malicious Windows Event Log Clearing via wevtutil
Suspicious Event Log Clearing via Renamed Log Utility
Suspicious Event Log Clearing via PowerShell Invoke-Expression
Suspicious Mass Windows Event Log Clearing via PowerShell (via ps_script)
Pivot detection · T1685.005 · 9 related

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