Suspicious Event Log Clearing via PowerShell Invoke-Expression

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell clearing Windows event logs, used in the SysAid intrusion to remove traces of activity. Programmatic event log clearing is a strong indicator of anti-forensic defense evasion following a compromise.

Reporting behind it

Related detections9 linkedT1685.005 — drag to rearrange

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Suspicious Event Log Clearing via Wevtutil (via process_creation)

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

Malicious Event Log Clear Attempt - Wmi (via process_creation)

Malicious Event Log Clear Attempt - Command (via process_creation)

Suspicious Event Log Clearing via PowerShell Invoke-Expression

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.

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